Answer: There are several common causes for this to happen. It might be caused by aphids, little sucking insects that can be controlled with insecticidal soap according to the label instructions, or by washing them off with a strong spray of water from the garden hose. It might also be caused by a variety of cultural problems such as cultivating around the plant and damaging the roots, overwatering, over-pruning, or even by large fluctuations between day and night temperatures. If you can correct the cause, the plants should recover.
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