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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Vegetable > Lettuce and Endive > Bitter taste

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Lettuce and Endive > Leaves > Bitter taste

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  • Image: Codling moth 1

High temperature

  • Lettuce may taste bitter if grown under high temperatures
  • Plant produces a flower stalk under multiple days of high temperatures (> 75° F)
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  • Image: Fruitworms 1
  • Image: Fruitworms 2

Aster Yellows
Aster Yellows Phytoplasma

  • Lettuce has a bitter taste
  • Plants infected when very young are overall yellow, stunted and may have deformed leaves
  • Plants infected when older; only center leaves are pale yellow and stunted
  • Drops of tan milky sap may be present at the midrib of the lower leaves
  • Symptoms are most severe in July and August
  • More information on Aster Yellows

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