Answer: Poorly draining soils are the most common reason for rosemary to turn brown. You can root tip cuttings of rosemary. Use the prunings to root new plants. You can safely trim your rosemary down by about one third without harming the plants. I shear off a few inches in the spring and again in mid-summer without problem. It keeps the plants neat and tidy and encourages lots of healthy new growth. Best wishes with your plants.
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