Question: When Should I Fertilize Cool-Season Grasses?
Common cool-season grasses include bentgrasses, bluegrasses, fescues and ryegrasses. The best time to fertilize these cool-season grasses coincides with the time when they grow most vigorously....
Answer: Fertilize cool-season grasses in spring and autumn -- the seasons when cool-season grasses grow most actively. But avoid fertilizing too heavily late in the spring, since heavy fertilization at that time can lead to disease problems.
More Landscaping Q&A