How do I make a terrarium?
Select any glass container: a fishbowl, a large open-mouthed jar or bottle, or even a brandy snifter. Get a sheet of glass to put on top. To prevent waterlogging and souring of the soil, and cover the bottom of the container with 1 inch of sand, mixed with lumps of charcoal. Then, spread 2 to 5 inches of general-purpose soil mixture over this.
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