Clever idea, and nice music. I think the puzzle aspect of this is worth exploring. The controls are a bit finicky, and the timings are tight. I would lean harder into the puzzle side of it, and away from the precision aspect.
It would also be very useful to have the bloom times for plants visible even after you’ve planted them. Maybe it could display next to the squares they start in.
It’s a good idea, could use some more intent in execution. Very nice work all in all!