Gardening Questions #004 – Can You Use Shells for Drainage in Houseplant Pots?

Sea shells should not be used in plant pots because they are made of calcium carbonate (chemical formula CaCO₃), which is exactly the same substance as limestone and garden lime. They will make the potting medium extremely alkaline. Some plants don’t grow well in alkaline soils! Any material that is added to improve drainage shouldContinue reading “Gardening Questions #004 – Can You Use Shells for Drainage in Houseplant Pots?”