[quote name='Daisydog']I'm trying, but it says I need more trees. And then I put down trees and it tells me I have too many

(probably just a few acres that need some). Now I'm just throwing flowers everywhere.
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I have the triforce

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yeah, it was telling me that for a while. and i finally gave in and made a grid out of my town by placing tiles on the ground. this would have gone pretty quick. but i made a mistake and gridded my town into a 4x4 grid, instead of a 5x5 grid. once i realized my mistake, i had to regrid everything and plant a bunch of more trees since i'd cut town a bunch.
the problem i was having, i found out, was that if you have too few or too many trees you need a ton of flowers. but there's a sweet spot.
for 8 of the squares (there's 25), if you have 12-15 trees, you only need 3 flowers.
and for the rest of the squares, if you have 10-17 trees, you won't need any flowers.
that's not the only way to do it, but for me it was the easiest.
edit - also i should mention. you can have too many trees, but you can't have too many flowers.