Grasses need an even supply of nutrients – especially nitrogen – during seasons of active growth. When and how often you should apply fertilizer to your lawn depends on the type of grass you have. If you fertilize grass when it’s naturally dormant, you will be wasting your fertilizer. Space your applications too far apart, and your grass will grow fine for a while, then slow down. Then with the next application, it will speed up again. My Landscapers can help you with your Denver landscape maintenance
In general, you should plan on feeding warm-season grasses from late spring to early fall. Warm-season grasses like Bermuda grass and St. Augustine grass grow rapidly in warmer weather. If you feed too early in spring, the nitrogen will promote the rapid growth of cool-season weeds. If you fertilize too late in fall, the grass is likely to be less hardy as it enters cold weather, and it will be more susceptible to winter injury.
The most important time to feed cool-season grasses is in fall and spring – and sometimes in winter. Fall is a very important time to feed cool-season grass so it grows longer into cool weather and therefore has the reserves needed for a quick green-up in spring. In fact, you should avoid fertilizing
cool-season grasses too early in spring. You end up with an overly lush top growth at the expense of root growth, and that can cause problems. If you fertilize in fall, the lawn doesn’t need another application until later in the spring anyway. Cool-season grasses such as Kentucky bluegrass and tall fescue grow most vigorously in the cooler months of fall and spring. In mild-winter climates such as the deep South and southern California, cool-season grasses can grow throughout the entire winter.
You’ll want to break up the yearly requirement of nitrogen into an appropriate number of applications. For instance, you’ll need one or two in spring, two or three in fall for cool-season grasses, and three over the summer for warm-season grasses. For maximum appearance, fertilize your lawn about once every six to eight weeks during the active-growth period.
If you don't have time for frequently mowing a high-maintenance lawn, fertilizing once in spring and once in fall for cool-season grasses, and once in early summer and once in late summer for warm-season grasses, can give you a nice lawn.
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Additional Resources: http://www.dummies.com/home-garden/lawn-care/when-to-fertilize-your-lawn/