Are rhubarb leaves safe to put in the compost pile?
Although rhubarb leaves do contain poisonous oxalic acid, they can be placed in the compost pile. Oxalic acid, like other organic acids, is not readily absorbed by plant roots. Compost containing decomposed rhubarb leaves can be safely applied to the vegetable garden. My ‘Spring Snow’ crabapple bloomed beautifully this spring, but has recently begun to lose many of its leaves. Why? The ‘Spring Snow’ crabapple is widely planted as it’s one of the few crabapple varieties that doesn’t bear fruit. Unfortunately, ‘Spring Snow’ is very susceptible to apple scab. Apple scab is a fungal disease. It’s caused by the fungus Venturia inaequalis. Cool, wet weather in spring favors apple scab development. Apple scab appears as velvety, olive-green to black spots on the crabapple leaves. Heavily infected leaves turn yellow and fall from the tree. Highly susceptible crabapple varieties may lose a large percentage of their leaves by mid-summer. Fortunately, apple scab does not kill affected trees. The
