Answer: Terra cotta pots are the perfect medium for moss growing, and will often develop a green algae growth all on their own. But, for a true coating of moss, soak your pots until they're completely saturated with water. Then collect some moss, toss it into the blender with some water or milk to make a slurry. (The milk provides sugar - you could use stale beer instead, or plain water plus a teaspoon of table sugar.) Use an old paintbrush to brush the moss slurry onto the pots. Keep the pots moist by misting them daily. In a few weeks the moss will begin developing new little moss plants, with roots that will adhere to the sides of the terra cotta pots. As long as you keep the pots moist, and in a shady spot, the moss will continue to grow. You can plant in the pot after the moss slurry has been applied.
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