Green Algae

Marijuana Horticulture

by Jorge Cervantes

Identify

Slimy green algae need nutrients, light, and a mist surface on which to grow. These algae are found growing on moist rockwool and other growing mediums exposed to light. They cause little damage but attract fungus gnats and other critters that damage rots. Once rots have lesions and abrasions, diseases enter easily.

Control

Cover the moist rockwool and growing mediums to exclude light. Run an algaecide in the nutrient solution or water with an algaecide.