Information provided at February's Twice on Tuesdays landscaping seminar confirms BobandMarilyn's advice.
Also:
Look for fertilizer that doesn't have more than a 2:1 ratio of nitrogen to potassium (first and third numbers on the fertilzer bag).
Total nitrogen content percentage should be at least 15% but 30% works better.
Buy fertilizer that is slow release, which is indicated by water insoluble or polymer coated written somewhere on the bag.
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