Every year we fill several planters around the outside of our house with petunias. The are pretty easy to care for, just water once a day and fertilize every other week. Over the years we were spending quite a bit on fertilizer until we found out about urea. Urea is a white organic crystal that contains about 45% nitrogen that can be bought cheaply at the drug store. Nitrogen is very important to the strong growth of lots of plants, and urea is the cheapest form we have found. Just mixing one teaspoon of urea to a gallon of water every other week keeps our petunias growing all summer long. By the end of the summer they are draped over the sides of our planters almost to the ground.
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