Q: Our hybrid amaryllis leaves have spots on them. Are they caused by disease?
--F.C., Gardena A: If the spots are reddish, they are probably caused by a fungus. Crowding, too much shade or soggy soil are the most common contributing factors.
Q : I have access to a planting of bamboo that I want to use to construct a patio wall. Do I have to do anything to the stems before I put them up?
--S.H., Hawthorne A: Bamboo stems should be dried or cured in the shade for at least three months to prevent splitting during construction. A dressing of linseed oil and turpentine also prevents splitting and preserves the light, straw color.