Common Causes of Bitter Lettuce Most gardeners will tell you that bitter lettuce is the result of summer heat; lettuce is known as a cool season vegetable. When temperatures rise, the plant snaps into maturation mode and bolts — sends out a stalk and flowers. Another answer to why does lettuce turn bitter is nutrition.Click to see full answer. Herein, is it safe to eat bitter lettuce?But the answer to the question, “Is bitter lettuce safe to eat?” is, for probably at least 99% of people, yes! So unless you are desperate for fresh plants to add to your compost, there are other uses for lettuce that is bolting that will extend their culinary usability. what type of lettuce is bitter? Romaine The rib also gives this lettuce a slight bitter taste. This is the lettuce originally used when the Caesar salad was created. Similarly, why is my hydroponic lettuce bitter? Lettuce doesn’t require too many nutrients to flourish. So, if your mix is too rich, it can lead to the bitter taste you have experienced. Although flushing your system is not vital to grow tasty lettuce, it can help improve flavor and remove the bitter taste.What does bad lettuce taste like? Taste the lettuce to see if it is sour. You are most likely familiar with the inoffensive, watery taste of fresh lettuce. Spoiled lettuce will taste the same way rotten lettuce smells. It will have a very strong, rancid, sour taste that will make you want to spit it out. Avoid eating the lettuce if it is sour.

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