Rosemary leaves can turn brown for a number of reasons. A common one, though, is due to too much or too little water. If your plant is in a pot, especially, make sure that it has adequate drainage and is not sitting in water. When watering, give it a good soaking, letting it drain through the bottom, but do not let it sit in water. Then, let the soil dry down to about 1 or 2 inches deep in the soil before watering again. Too much water can cause root rot, which can cause browning leaves. Insects and diseases, as well as cold temperatures or a sudden change in lighting (such as by taking it from bright light outdoors to a lower light level indoors) may also cause browning leaves. Make sure that your plant has enough light, and if you think it is getting too much water, let it dry out (drain off any excess water, if applicable). Hopefully, the plant will recover in a week or two.
Rosemary leaves can turn brown for a number of reasons. A common one, though, is due to too much or too little water. If your plant is in a pot, especially, make sure that it has adequate drainage and is not sitting in water. When watering, give it a good soaking, letting it drain through the bottom, but do not let it sit in water. Then, let the soil dry down to about 1 or 2 inches deep in the soil before watering again. Too much water can cause root rot, which can cause browning leaves. Insects and diseases, as well as cold temperatures or a sudden change in lighting (such as by taking it from bright light outdoors to a lower light level indoors) may also cause browning leaves. Make sure that your plant has enough light, and if you think it is getting too much water, let it dry out (drain off any excess water, if applicable). Hopefully, the plant will recover in a week or two.