Mescaline of the genus "Echinopsis" are technically controlled substances under the Controlled Substances Act, they are commonly sold publicly as ornamental plants. In the United Kingdom, mescaline in purified powder form is a Class A drug. However, dried cactus can be bought and sold legally. Mescaline is considered a schedule 9 substance in Australia under the Poisons Standard (October 2015). A schedule 9 substance is classified as "Substances with a high potential for causing harm at low exposure and which require special precautions during manufacture, handling or use. These poisons should be available only to specialised or authorised users who have
Plant–soil feedback Plant–soil feedback Plant–soil feedback is a process where plants alter the biotic and abiotic qualities of soil they grow in, which then alters the ability of plants to grow in that soil in the future. Negative plant–soil feedback occurs when plants are less able to grow in soil that was previously occupied by a member of the same species, and positive plant–soil feedback occurs when plants are more able to grow in soil that was previously occupied by a member of the same species. Although it was originally assumed that negative plant–soil feedback was caused by plants depleting the soil