The United States Department of Agriculture found that salicylic acid produced an enhanced immune response in plants of the nightshade family. The enhanced response helped prepare the plant for microbial or insect attack.
Gardeners at the University of Rhode Island sprayed a mixture of aspirin water on their vegetable gardens and found that plants grew more quickly and were more fruitful than a control group left untreated. Aspirin in vegetable gardens produced healthier plants than the control group. The team used a rate of three aspirins (250 to 500 milligrams) mixed with 4 gallons of water. They sprayed this every three weeks throughout the growing season. The vegetables were grown in raised beds with drip irrigation and compost-rich soil, which probably aided the effects found from using aspirin for plant growth.
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