Last year our Maple tree had thousands of helicopters. So far this year, I see none. I do not want to put mulch out until I know for sure they are not falling. Can you tell me why one year there are thousands and the next none (so far).

I depends on the weather.  Last was a good one for them.  This last winter was tough on them and we also has three nights of hard freezes in early April which may have frozen the flower buds which would eliminate the possibility of flowers this year.

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