Can I apply starter fertilizer to an established fescue lawn in February without hurting it?Sure - fescue can not read the label in your fertilizer bags…and I guarantee to keep your secret.
Typical “starter” fertilizers have a higher percentage of phosphorus (the middle number on the bag) than “maintenance” fertilizers. Even so, the bag contains lots of nitrogen (the first number) which can be probably the most important nutrient for turfgrass.
The timing of fertilizer applications is considerably much more crucial to fescue than the label.
Considering that fescue does the majority of its growing from September through Could, that is when the majority of fertilizer needs to be applied.
I recommend four applications: September, November, February and April. The directions around the bag will let you know how much to put out each time.
In the event you stimulate vigorous growth during the cool season, fescue is much less probably to have weed problems and is a lot more probably to survive the summer months without thinning out.