For cool season grass varieties such as bluegrass and fescue the answer would be no, as fertilizing during the summer months can cause lawn diseases and can stress or burn a lawn. During the summer months, we apply weed control products (herbicides), fungicides, insecticides and organic type products which are safe during the summer months. As for warm season grass varieties such as zoysia or bermuda grass, it is just the opposite where it is best to apply fertilizer during the summer months and not during the months when the grass is dormant.
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