Little Brown Spots on Lettuce
The depth of red that will eventually develop depends on a variety of factors.
Many AeroGardeners report "little brown spots" on some of the leaves in the Salad Greens Seed Kit. Perfect! That's the normal pigmentation of red-leaf lettuce, and as the leaves mature you will see more of it. This is a red leafed lettuce just starting to show its colors. The depth of red that will eventually develop depends on a variety of factors such as temperature, light and water quality.