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How many wicking baskets for a shallow container?

Athenian
11 years ago

I'm thinking of using a galvanized washtub as a self-watering herb planter. Since the tub is only about 11" tall, I'm thinking of using multiple 2" net pots as wicking baskets. Should I use 2 or 3 wicking baskets for a 24" diameter tub or just go with a larger 4" backet and shallower soil?

Thanks.

Athena