Good day John. There really isn't a "plant" fertilizer or a "grass"
fertilizer nor is there "plant food". All fertilizer is nitrogen,
phosphorus and potassium in various amounts. Nitrogen is the chemical that
gives plants their green color and phosphorus is needed for flower
For lawns and other grasses you would want to supplement them with more
nitrogen than any other chemical. The numbers on the bag/container of
fertilizer tells you how much of each chemical the bag contains. The first
number is _always_ nitrogen. A bag of fertilizer that has a 21-3-7 number
on it is telling you that the bag has 21% pure nitrogen in it.
If these grasses are in a mixed flower bed, then fertilize them with the
fertilizer that your going to be using for the other plants. No need to
use different fertilizer for them. Most flower bed fertilizers will be a
low nitrogen number and higher phosphorus and potassium numbers. I use a
10-16-10 for flower beds for the most part.
If you use a high nitrogen fertilizer in your flower beds you will have
much more green growth than flowering which is generally not what people
want out of their flower beds.
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