Jeff wrote:

I fertilize in the fall only. In the fall grass puts its energy into root
growth, in spring blade growth. Sure if you fertilize in the spring your
lawn will have darker green color, but you will be mowing frequently. In
damp climates lots of blade growth can also lead to mildew and fungus
problems. There also tends to be more weed growth in the spring so avoid
helping them out. Sometimes I apply broadleaf weed killer in the spring if
the dandelions and clover are getting out of control.
"tenplay" wrote in message

Most county agents will not recommend fall fertilizing. It promotes new
growth just prior to freezes which is detrimental to grasses. It's
best to let the grass toughen up for the winter months.
If your lawn has been kept in good shape over the summer, it does not
need "root energy" in the fall. (Contrary to fertilizer manufacturers
literature since they want year round sales).

Bob S.
(A master gardener who works with the county agent)