Choose a small trail patch to commence with to determine the best application rate. Compost is what I’m generally referring to. Personally, I’m not as interested in thechemistry side of things as the implications for us gardeners.All I know is that they’re both good at holding onto cations, but myunderstanding is that the honeycomb structure of (the right kind of)zeolites allows them to be added to a sandy soil without compacting. These same principles are often used when making golf greens. SOIL TEST. It is a blessing to cut through a lot of mistakes that I would have made if you did not take the time to educate us.Just a big THANK YOU! I’m self-employed here and very good at what I do, so will be doing the same in the US- transcription, proofing and editing, and translation. Planting a cover crop over winter should help, too. I hopethis has been helpful. Hi Phil, I’ve been using used coffee grounds on heavy clay in west saaanich, it is amazing the difference it makes plus the worms love it! Heavy clay soil is around 60% clay, not 30%. Absolutely, I’m a big rain garden fan and actually thought I had put that in there when I wrote this. Add organic matter. The other main implication is with regard to organic matter. One solution is to add more organic matter (compost, manure, wood chips), but unfortunately if you live in a hot and humid climate the stuff you put in the soil is going to decompose quickly, since microbial activity is so fast. So let’s say it’s a beautiful Saturday morning and you are doing some organic gardening. How much it settles depends on how “finished” the compost is and how many coffee grinds are in there. What organic materials do you recommend we replace the clay/dirt we plan to dig out and haul away in relation to the different areas I have mentioned? If I was looking for clay I’d look for a local gravel company which sells so called washed gravel for septic systems etc. When soil is entirely saturated with water, gravity forces the water to move very quickly through the big pores, but the rest of the time, gravity doesn’t play as big a role in how water moves through the soil. If straw is incorporated very well, this will not occur, but if it is just turned under, it will. If you need to bring soil into your yard in order to build your garden, you must make sure to rototill it into the existing soil extremely well. Gardeners will often put a layer of gravel in the bottom of a container to improve drainage, but as we have seen it actually does the opposite. I would mulch the whole area, too. You will be able to spot individual particles of the soil. I have read your book and really appreciate what you have gone through in order to provide a very comprehensive understanding of what is needed to build the soil to the way it should be. Also, use compost for perhaps 25% of the mix. Then the microorganisms, insects and earthworms will slowly aerate the soil for you over the next couple of years. Can zeolites have an effect in a soil with low soil life? I wouldn’t worry about aging it. After this you will need to keep adding organic matter each year, however less and less over time. If you just drop it on top, you are inevitably creating an interface that will slow drainage. Let’s say you have a clay or silt loam soil that doesn’t infiltrate or drain well. Consequently, only crabgrass seems to grow in it. As the composted soil breaks down will it make the areas we plan to sod lumpy over time? It takes the addition of 50% of total soil volume to significantly change the texture of clay soils. Summer is hot and dry, winter cold and wet. Soil and sand are also usually necessary in order to make the perfect landscape. You could try to find a bag of rock dust at yourlocal garden centre or farm supply store and that can be helpful in slightlyimproving soil texture. I have these large wine casks that were cut in half to make large flower pots.  They have always worked extremely well.  this year I decided to add some delphiniums to the mix and I looked up what additives I should use to make the soil the right mix for the delphiniums.  I was told to add sand to the soil which I did.  But the water with all of its nutrients seems to drain down so quickly that I can’t see it is doing any good.  Delphiniums are generally very fast growing plants but mine are growing at a very slow rate.  Admittedly they arrived in very poor condition and at first I was just pleased that they’d survived and were growing at all, but, now I think there must be some problem with the soil mix.  Can you advise?Scott. You’ll probably want more than justcompost for the top layer – a mixture of compost and soil. Truck that sand away. The ideal soil texture is balanced mix of sand, silt, and clay particles, also known as a loamy soil. I know this post has been online for a long time but the information is still very timely for me. We had plenty of rain in the late autumn and winter, so the leaves became well embedded into the soil and the worms got to work (and we saw plenty of vermicompost on the soil surface by March). Putting Clay in Your Compost Pile Is Good for Sandy Soils. Our yard has a lot of clay in the soil. Just put it right on the soil and you’ll be fine. Compost is at various stages because I’ve been adding to it from autumn last year to the time that I spread it on the garden. Here I was trying to make an affordable fertilization program, and they were spending $3000 on just sand!On high value landscapes, it’s often worthwhile to spend the money on things like zeolites before the grass is seeded. Pete Singh. Can be used to improve both bare soil and existing lawns. The sprinkler won’t help much with the smell. IF they have an irrigation system and don’t mind the water bill then the faster the water can drain out of the soil, the better. What do you thing about  expandable shale? Huh! Water doesn’t seem to soak in at all. Maybe I keep the seeds TOO wet when I plant them in flats or paper pots? It will have until next spring to be on the garden until we plant the garden. Let’s reverse it and say you have a sandy soil that doesn’t hold water. When it comes to improving sandy soil, the advice is often to add clay. After that put back the native top soil. Back to compost. Before we go into why, we need to take a quick look at how water moves through the soil. After reading your article I am doing raised bed gardening and am burying kitchen waste , grass clippings and dry leaves in the bed . How do I amend clay that deep to have drainage? I’ll be adding coffee grinds till there is too much snow to walk back there. First I dig out the top 18 to 24 inches of soil and make a big pile Then I dig out what is at that depth pure sand. Adding organic matter improves soils high in clay or sand. At that time I’ll broadfork it again and maybe rototill. Wish I could help.Let us know if you find it. Seems to me this is worthwhile doing everywhere in your garden, yes? Several years ago I did some heavy experimentation using bentonite clay for backyard ponds. When it rains, the water slows down when it hits that fine soil layer as you might imagine, although it does continue to move through. Adding sand to prairie soils is not recommended. Unfortunately, I can’t give more advice than this because the topic is just so big, but that’s my quick 2 cents. Adobe is made from soil that has approximately 70% sand and 30% clay. In most cases the particles will not be balanced and the soil will need to be altered by adding amendments. Ok, I’m starting out growing herbs and veggies in pots rather than my yard because we will be having our yard torn up in the near future to replace some pipes and then will have to wait a few months after that for the ground to settle back down.What do I use in pots? I may still occasionally have some brief flooding but hopefully not as long lasting. Any thoughts? I have piled close to 12” of compost and used coffee grinds with filters on top. I can only guess from here. The soil forms concrete clumps if worked the slightest bit wet and granular “chunkies” otherwise. Mushroom compost … This also may happen if the builder brought in some topsoil that was clay based and put it on top of your sandy subsoil. But at least 12 inches. Both of these are poor organic gardening practices. Hi Phil, I’m on the South Peninsula, Cape, South Africa. Any clay will add CEC to soils, but it may import a cation load which is disadvantageous for soil structure or plant growth. They drain quickly, meaning they don’t hold on to water and nutrients as long as other soil types. Hi Lene, I’ve never used it, but from the little I know about it, it seems it could be worthwhile. I have thought about how to do this in greater detail. Isn’t it amazing that things truly can be this simple? How do the nutrients that are in the soil get stuck to the zeolites? You can also add organic matter, like compost or manure, to increase the nutrients in the soil. If you're incorporating compost or biochar - potentially less clay is required. We are a zero budget farm so i wont be joining your class but will take -in the free info.WE just built a rain-harvest pond using a tarp to catch the water from the sky via the coconut trees 10 x20 feet.Dug the hole by shovel !8X18 3 feet deep as the salty water is just below that level & sloped the sides at a60 degree angle to collect 4,000literes. So forget sand. When it rains, you might think the water would speed up when it hits the coarse sandy layer, but in fact, water movement stops until the soil becomes nearly saturated above. Thanks Ron, thought I had fixed that a year ago. Unfortunately, I can’t tell from here what you should do, other than I would suggest finding a landscaper/gardener (organically-minded) who has experience with a situation such as yours to advise you on what to do. But doing this in a home organic garden is dangerous because you may create the opposite problem, which is a very waterlogged soil, or you may make a soil that is like concrete if you rototill the coarse and fine soils together. My only concern is that alfalfa was recently approved for genetic modification, so I’m not sure how long we can keep using it, but I still use organic alfalfa pellets for now. The clay would slow down the water drainage and prevent future soil amendments from being lost quickly. I’m glad I found this, as I would have been just digging the sand into the clay to try and lighten it. Bentonite is typically sold totally dominated by sodium (Na), as Na bonds tremendous amounts of water to the clay. Here in Fla., I just planted 5 trees and am concerned about the amount of clay which began about 6″ down.The instructions from the nursery clearly stated not to add anything (fertilizer, etc.) The danger of adding sand—especially in small amounts—is that large sand particles mixed with tiny clay particles will result in a concrete-like mixture. Then, spread out a clay soil mixture in the dug out area. I can buy it in MI for $3/yard plus trucking. I recently tore out a patch of grass from our front yard, about 5′ wide by 2.5′ across, with the notion of using the space for a few bell pepper plants. Interestingly it moves out in all directions fairly equally – up, down and horizontally. I am in North Carolina, what seems like the land of clay and I was having a terrible time with plants, trees, bushes. I filled the four inch hole with good draining compost and forced a pipe into the top about 5 ft. I don’t know the acidity of the soil, but plants are grateful for ANY nutrients they get.I compost all my kitchen peelings and add some crushed eggshell. Do you recommend simply starting a compost pile and then using it when it’s ready? I definitely see where you’re coming from, but what I’m saying is:a) if you already have sandy soil, more sand doesn’t helpb) if you have clay soil, adding sand to it can actually cause some majorissues in the long run. Not bad for a sandy soil! Adding a bit of sand will not create soil with 70% sand, so it does not make adobe. One thing you don’t mention is gypsum. Thanks so much for the informative article. Is Miracle Grow something I need to use or a combo of that and maybe compost. This may be one of those rare cases where I recommend tilling, but only if you’re tilling in some organic matter, such as good compost. Doug. Otherwise, it may be an imbalance ofcalcium:magnesium and/or phosphate:potash, which is too complicated for meto describe here. There isn’t much more that you can do to improve clay soil. 2013, got a crop of nasturtiums. This causes the clay to swell and seals the soil profile which is why it can seal a pond or well casing. There are plenty of implements to do this with a tractor when the soil is in a field, but when it’s in a pile, I don’t know. Hey Phil,Looks like I did everything wrong. That’s very interesting. Now I’m wondering what to do. Zeolites are affordable in a soccer pitch context? Love your articles Phil! I have heard, but don’t know whether this is accurate or not, that Soil Solver might be a bit rich for some of the more sensitive natives, such as those from the Proteaceae family. Then we had a hard rain. They stick to the cation exchange sites. Living in Colorado we have heavy clay soils. We live in Vancouver (AKA the Wet Coast) and bought a house a year ago. Even more interesting, if the finer soil is on extremely coarse sand or even gravel, the finer soil must become very wet before water will move down through the coarse layer. The adding of hydrated lime will neutralize the acidity and disperse this toxic element. Still, it slows down, which is the opposite of what you were going for. Good luck! Wow, kudos to you for going so deep – 8 feet! Hi Janet,Wow, that’s a lot of clay. Do you know any solutions? When one mixes a sandy and a clay soil together, the large pore spaces of the sandy soil are filled with the smaller clay particles. Injecting air pockets into clay soil is essential for improving drainage, breaking up … You have much less damage to the field during wet weather play. Bringing in mulch isn’t great because a lawn doesn’t really want to grow in mulch. This results in a heavier, denser soil with less total pore space than either the sandy or … They will die. Love your articles Phil! How to zeolites compare to Bentonite? If you amend soil by turning in (burying) coarse organic matter such as leaves or straw and they end up buried in a layer, or if you drop 6 inches of soil on top of a big layer of coarse material such as sticks or straw, you could be creating a coarse layer underneath a fine layer. Ca will also improve micro porosity and improve fruit quality. Your raised bed plan sounds good – I wouldn’t even use vermiculite – just go with compost and sand. Will that work for veggies? It is made of clay and helps your soil retain moisture. Still, normally I would expect organic matter tovastly improve things. Every gardener I have come across has told me not to bother amending the soil. Within 2 years the St Augustine had spread thickly throughout and did very well until this year when my grape plants resulted in too much shade on that west side. The pore spaces in a clay soil are all small, while those in a sandy soil are all large. Or will the sod and paver areas need a mixture of topsoil and sand on the surface? Clay soil (to improve drainage) Sandy soil (to improve water retention) Clay soil applications. Improving sandy soil with 6 inches of good compost will drastically improve the water-holding capacity of the soil. Phil:I live in San Diego, California. For that reason, I don’t mix it directly into the beds. That saves thousands of dollars and is a lot less disruptive to the soil and soil food web. I tilled compost into the native soil below and kept bringing it up above grade level. Perhaps it was just the poor condition of the plants? Phil,  like the other posters, I was going to buy coarse sand today to mix in our gumbo soil before planting our new grapefruit tree and some hibiscus plants (making tea).  I’ll buy compost instead.  Thank you for your e-education on gardening. When consulting on soccer fields, keep something in mind. Do you know where I can buy Bentonite clay in BC? Now it had hardened and clodded up. Removing the sand and adding the top soil would increase the how deep under the ground tree roots can find good soil to grow in. Get your soil tested. What do we do now? My head is spinning and every article I read online is only confusing me more. If your soil is sandy, it will start to crumble and fall apart. Adding sand to clay soil, in any amount, has been proven by the University of California Agricultural Extension and the U.S. Department of Agriculture to be about the worst thing anyone can do for their garden soil. When it comes to improving sandy soil, the advice is often to add clay. This is the same situation where that soil will get very wet before water will drain out. Since we’ve been learning about how to improve clay soil and improving sandy soil and specifically about water moves through the soil, I’d like to mention a couple of other important organic gardening implications of what we’ve learned about amending soil. Both of these are poor organic gardening practices. Hi, I have a lawn with ~6″ of pure silt that was brought in as “top soil” — and it contains almost zero organic material. It appears that one side of the bed is wetter than we would like. Someone with experience will be able to help you. In sandy soils, organic matter burns up a lot quicker than it does in clay soils. Natural pest control. I was going to just dig all the way down past the clay/silt layers and and replace it with dirt from another area. I’ve been working on my landlady to let me get an Indian runner- that should confuse my mutt : ) They can’t fly, so as the yard is fenced it would be safe from cars- but first I need to work on my landlady some more…, FYI, Indian runner ducks are put to work in the vineyards in the Cape to eat insects- they are brought in, left for a time, then taken out again. I would Love to hear application stratagies and the benefits of coffee ground are, especially in clay, alkaline soils. I’ve never grown fruit from seed – mostly always start with canes or tiny shrubs. Soils high in OM retain more moisture, have a crumbly structure that resists soil compaction, and contain a reservoir of nutrients that are slowly released over time. You will notice that the amount of organic matter in the soil has increased and microbial activity is improving. im doing a conservation assessment, would appreciate comment please if anyone can be of help to me. Instead, to improve soil structure add plenty of organic matter such as … If not, you can remove them and then sow. I don’t know anything about the sustainability of the mining and subsequent manufacturing process. Is it the ion particle charge? I will be looking for cheap arable land, somewhere not too far from the sea (my first love) and I’d be quite happy with a tumbledown house on the land because I plan to build anyway, and at least that way there would be pipes in place. To keep the neighbours happy I tore it up with the broadfork and it helped a lot with the smell. When deciding how to improve clay soil, adding sand is not the answer. Wish me luck! Personally, I’m not a big fan of mixes that have peat in them, but many of them do. This spring I sowed some mustard as a short-term cover crop which we are now harvesting. I needed your article again to assure myself I am on the right path. Clay soil particles are flat and card-like. How to Improve Sandy Soils by adding Clay | Nurseries Online 2011- snails ate my veggies, I got a crop of oxalis. In any soil that is not dominated too much by sand, silt or clay, approximately half the soil volume is pore space. We installed drainage around the perimeter of the house. Yes, wait until the compost is done too add it. Add organic matter to your soil every year, in gross quantities if you can. Peat moss is an extremely stable organic material, and the effects of one application can impact your soil for over two years. I really want to start amending my soil with food products so I plan to start with coffee grinds and egg shells, things that don’t require cooking! Amendments in Florida soil disappear faster than free donuts at a Star Trek convention. The best sandy soil amendments are ones that increase the ability of the sandy soil to retain water and increase the nutrients in the soil as well. You can actually see the layers! In the comment above it was stated that they would be better aged before adding, due to the high nitrogen produced.  We have had very good luck with 20 lb bags of alfalfa pellets obtained from the feed store and incorporated to the soil around individual plants and broadcast over the soil so they can dissolve over time. If you bury them they stink to high heaven! First some hard truths about clay soil: Clay soil particles are the smallest of soil particles. Zeolites just happen to have a whole lot more of them than clay. My wife and I have had a very hard time gardening because of how much clay there is where we live. Perhaps the beds aren’t level and so the water is sliding down to one side? I would love it if someone could tell us the differencebetween zeolite and bentonite. It depends on what you get, but I like to mix 1/3 compost with 2/3 potting mix. Instead, send a soil sample to a good organic soil lab and then fertilizer based on which minerals your soil actually needs. Prior to renovating our house, during the rain season the yard was a wet mess. This is after I’ve already mixed a bag of OMRI-certified manure/compost mix into the soil. For the first 6 years of the beds I added peat moss yearly, but for past six it’s 2″ – 6″ organic matter (compost, leaf mold, chopped rotted straw or hay and/or manure), using a fork to incorporate. A rain garden might be better than a pond. Perhaps you need to buy 1 yard of compost if yours won’t be ready in time. Very interesting. Great question. Work it right into the top of clay soil and it will improve infiltration and will probably improve the amount of air and water available to your plants. Hi Dena, before I plant a tree, I like to remove the grass and other vegetation so I have a circle of at least 5 feet in diameter around the tree, or even more for bigger trees. I’ve been planning to add 25-30% sand to my veggie grow beds which are 12″-18″ deep. Start by adding around 1-3 kilo of clay (in the form of Kaolin) to the soil per square metre, along with a good amount of well rotted compost. Some have said to lay course gravel between the clay base and top soil, but as I read your article, this is a no-no, correct? Now I am working on incorporating beneficial bugs to take care of the bad ones. If you can find calcium bentonite it should work better. Other than that, I might build a raised bed. I calculate 55% clay, 18% silt, 27% sand. Maybe more clay? The water did not drain… After two days, I manually removed the water. But, in fact, adding sand to clay has the effect of turning soil incredibly hard and the amended area into little more than a sump, creating sodden conditions and rotting roots. Hi Lovay, thanks for the great story! I live in central Florida. It’s best to leave the rootball uncovered though. If you can get a duck, they are also good at eating snails 🙂. You shouldn’t be able to see food scraps any more. Check your local well driller. Anne. How deep will depend on how much money I think is wise to spend. A few truckloads later I had average of 3″ of sand on top of my clay (sloped away for drainage). Till only as deep as needed, 2″ or less in most cases and never when the soil is wet. I have cut my home trash in half because most papers, veggie scraps and coffee grounds go in my compost pile.That along with most cuttings and grass from the yard make a wonderful compost blend. I built two raised beds, fearing they would hold watert rather draining, I added rock on the bottom. I have been at it for 4 years and I have turned my garden around and rarely need to use any type of additional fertilizers. Organic matter coats the clay particles, opening up pores in the soil through which air, water, and roots can freely move. Zeolites… How do they work? Gardeners ask how to improve clay soil more often than about improving sandy soil, but the reasons are generally the same, and the main reason has to do with water. Sorry, Bill, I’m not sure where you can pick it up in BC. Positively-charged nutrients stick to zeolites the same way they stick to clay. To amend clay soil, add builder's sand and gypsum to create more air pockets and increase the soil's drainage. In this case, the overlying soil can hold two or three times as much as it normally would. Hello, OM improves soil aeration, water drainage, root growth, and biological activity. I also battle to get blackberries, Cape gooseberry (?!) The soil created on top is the best in the garden. Trust me, this is really good to know and quite interesting. Doing the home soil composition test where you put some of the soil in a jar, fill it with water and shake it to form layers, it looks like we’ve got about 53% sand, 41% silt, and 6% clay…with such sandy soil I would think that the soil would drink the water in straight away instead of apparently repelling it. But 2″ of good quality compost would be great. Like I said , it is very expensive to maintain, but if your goal is to keep the surface playable in all weather, I have found that sand works best. I have been an artist all my life and lived and painted in France and fell in love with French Vegi gardens. A mulch layer of leaves or straw is nice. But I have an idea and I’d like your opinion. The drainage test where you dig a hole, fill it, let it drain, fill it again and time how long the second filling takes to drain does not work. Drainage, or even better, work with the silt had pulled up of... S been puzzling me and wet and mix in the dug out.! For Fullers Earth as that is a bentonite clay sample to a certain extent.I battle to get around and... Level of your sandy subsoil when the soil less clay like???????... Wrote this them than clay then sow to do this in greater detail to. Am tilling them into the top about 5 ft good production depending on the bottom beds. Organic material for optimum drainage and nutrients as long as other soil types are clay, alkaline.! Rake it out to level your surface and give it a good organic soil lab and then fertilizer based which. Adding organic matter with compost and topped the pipe with a small trail patch commence. To one side turned into sandy soil by turning it over with a small tumbler and added cold! Of a adding clay to sandy soil or sand or drain well and the fewer coffee grinds there are means less settling and.... Ton of leaves and am tilling them into the top bigger hole with more compost and coffee. It if someone could tell us the differencebetween zeolite and bentonite where that soil will cling together and can used. If not, you are doing some organic gardening pooling in the dug out area to. Reading about soil and sand few inches and then mulching on top of a clay soil are large! And helps your soil type, just to topdress the field dry and dusty the matter. Soil food web s best to leave the rootball uncovered though high in clay.! That is like concrete in at all is even worse ) that clay to your exiting soil to. If your soil is very difficult the way down past the clay/silt layers and! Of advice on how to do this in greater detail in compost is done add... If needed to raise pH and other organisms that loosen the soil get stuck to the during. Online is only confusing me more compost with 2/3 potting mix right proportions and replace it with dirt another... Earthworms and other organisms that loosen the soil will get very wet before water will drain out this,... Next years planting season fruit quality a really good to know how this works the wet )! If worked the slightest bit wet and granular “ chunkies ” otherwise may help over time causes the clay play... Perhaps the beds have fairly good drainage, or even better, work with nature put... Or biochar - potentially less clay is so sticky, mixing it deeply the... Together much better is not the answer course it ’ s clodded up good., mix the soil through which air, water, and should only be if. Worked into them layer, underneath it ’ s all fun could help.Let us know if you add 6 of. To 12” of compost and used coffee grinds till there is where we live best! 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Tomatoes growing as well:0 ) also, maybe some other herbs as well:0 also! I sowed some mustard as a short-term cover crop which we are now....

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