answersLogoWhite

0

Rosemary can turn black due to a few factors, primarily related to disease or environmental stress. Fungal infections, such as root rot or powdery mildew, can cause blackening of the leaves and stems. Additionally, overwatering, poor drainage, or high humidity can create conditions conducive to these diseases. Environmental stressors like extreme temperatures or insect infestations may also contribute to discoloration.

User Avatar

AnswerBot

4mo ago

What else can I help you with?