dyzzypyxxy said:Organic material is best, David. Some of your compost would work. Anything that is made out of cellulose fibers, as all plants are, acts like a sponge, absorbing water, then releasing it slowly. That is why you need to amend poor sandy or clay soil with compost, because the little cellulose fibers expand with moisture, then contract to leave air holes in the soil.
But if you have unglazed clay or terra cotta pots, they also absorb water, and release it slowly. They have a cooling effect on the plants' roots and the air around them, too. So placing a clay pot in a shallow pan of water, then placing another plant pot inside it will surely keep that plant cooler and more humidified.
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