Are Lavender Plants That Turned Black Dead?

Shab

• Lavender shab is a disease infecting lavender plants by discoloring and wilting it. Recognize shab discolorations on the plant. The stems turn brown, and then black spots appear. A fungus causes shab. The only way to help prevent the spread of shab is to make sure you do not plant your lavender plants too closely together. The fungus spreads easily from plant to plant.

Stopping the Spread of Shab

• Halt shab spread by pulling out the lavender plant by the root and burning it in a safe place. Place new lavender plants in a garden bed with well-drained soil and access to good sunlight and airflow.

Root Rot

• If you notice black leaves that are wilting on your lavender plant, then it is likely your plant is suffering from root rot. Root rot occurs when the soil is too wet and fungus begins growing. Cut back the diseased parts of the plant. Make sure your soil is well drained and do not overwater the lavender plant.

Growing Conditions

• Prevent plant disease by creating an optimal growth environment for your lavender plant. Prepare your planting section by loosening the soil and mixing aged manure, sand and river rocks. Pick a location with good sunlight. Shape mounds of soil about 8 to 20 inches high, which settles as it rains. Make a shallow cone at the top of the mound, add the lavender plant and spread soil over the roots.