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Sepiolite is a clay that's non-toxic (it's used in animal feed) but unlike vermiculite and perlite actually hurts, rather than helps, drainage. According to this source, it can absorb its weight in water. Unlike a hydrogel, it does not release the water back to the roots. This will leave your soil waterlogged, which will kill most houseplants. Interestingly, ...


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Thanks everyone for their answers and suggestions. What I've decided to do is to use sifted compost (regular vegetal compost, not vermicompost/worm castings). I'm using only the coarse part of the compost (the one that stays on the sieve). This guy made a very interesting video on water retention for different materials (both organic and inorganic). Video ...


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A cheap ingredient that is available at feed stores is chicken grit. What is available near you may vary but common sources are granite, calcium, flint or oyster shell. It is sold as tiny sharp edged fragments. It goes well with peat based soil mixes that are often acidic as the calcium or oyster based mixes are usually alkaline. It does not degrade and ...


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It depends on what plants you have .For my orchids, which need good=fast drainage and air circulation , I use small gravel, porous rock ( lava stone ,very similar to tufa but cheaper ) , chunks of bark, charcoal and maybe a pinch of potting soil . For bromeliads and cactus , I use mostly sand and enough rock and gravel to physically support them. For large ...


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