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What To Do To Prevent Your Home-Grown Lettuce From Tasting Bitter
Homegrown lettuce can quickly turn bitter for several reasons, including high heat, a lack of water and drainage, deficiency of nutrients, and diseases like aster yellows.
To prevent this, first place your plant in a shaded area or cover it with a shade cloth. Lettuce needs five hours of daily sunlight; direct light beyond that can cause it to bolt.
Give your plant about 1 to 2 inches of water per week to ensure the soil is moist. Water more frequently if the soil dries between sessions, but take care
not to waterlog the soil.
Check if the soil is draining adequately and add some mulch to the soil to help it retain moisture and fertilize it.
When harvesting, pluck lettuces early in the morning to save them from heat stress. Soak them in cold water for a few minutes before drying and refrigerating them.