What's the difference between 10-10-10 and 20-20-20 or 7-7-7 ???


the answer is basically nothing, other than the lower number fertilizer has
more filler in it than the higher, which dosent really matter unless the bags
are exactly the same weight and price, then you would go with the higher
because it cover a larger area. Ignore the fancy labeling on the bag and look
specifically at how much actual nitrogen, phosphorus, and potassium is in the
bag and how much the bag costs. Most garden centers sell the same stuff in 5
different bags with different labels for lawn, trees, flowers, acid loving
plants, and so on. 10-10-10 is the one that is always recommended for whatever
reason, but anything under 15-15-15 usually has a large amount of filler which
can raise your soil pH. At any rate, the important thing is to have a balance
fertilizer that contains at least N, P, and k.

Toad