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The numbers are confusing if you don't understand how they were measured, because the quoted "dry matter organic content" of 40%-50% does not account for all the organic material in the original compost. Drying the compost in an oven to measure the "dry matter weight" causes chemical reactions in the organic material and the volatile ...


3

Perilla is an annual herb and can be subject to rust which shows as rust coloured spots. As the spots on the leaves in the picture are light coloured it looks like aphids or spider mites which suck sap. Spider mites are the size of a grain of salt and cluster on the undersides of the leaves. You may need a magnifying glass to see them. They make a web when ...


3

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, ...


2

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 ...


2

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 ...


1

Typical ingredients depend on the plant and soil needs. Little water holding requries good drainage. That's done with Sands or lava rocks, perlite.


1

For your lemons and strawberries this will probably do (use pots with drainage holes though), but for cacti it is advisable to use something else (with better drainage capacity, and less peat). You can buy special cactus potting soil (e.g., Pokon), it contains more sand or gravel of some kind to encourage proper drainage. You can also make your own cactus ...


1

Many succulents/desert type plants are expecting their water and nutrient in short sharp bursts; some get most of their water and food from being either drip/rained on, or absorbed through water accumulating in the cupped axils of the leaves. So the function of roots is mostly to keep the plant solidly in place, either in desert grit or clinging to the bark ...


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