Strictly speaking, fertilizing annuals isn't necessary, but for best performance, it's highly recommended. Remember, annuals are high-energy plants that respond impressively if you fertilize them regularly. See Chapter 4 for more information on fertilizing.
The effects of adding plant food can be dramatic but not instant. Keep an eye on your annuals for a week or two or even three before concluding that you've given them enough.
By and large, annuals lap up nutrients eagerly and use this extra nutrition to produce more and healthier growth and to bloom like gangbusters. So you'll be amply rewarded for your efforts!
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