“Feeding” plants too often with fertilizer can cause what’s known as “nutrient burn.” The plant’s body can’t use all the nutrients that it’s absorbing and the chemical overload can cause it to lose leaves, have stunted growth, wilt, or even die.
EDIT: Some helpful people have pointed out that this actually doesn’t have anything to do with the plants processing nutrients, but rather that many of the nutrients in fertilizer are chemicals and salts that affect the roots’ ability to absorb water, and this is what causes the affected plants to appear “burnt”. It’s less like diabetes and more like choking on your food.
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