Maybe instead of just being able to pollinate as many times as you want there could be an expensive one time use chemical in the shop that allowed you to re-pollinate.

If it were expensive enough, it wouldn't make the game easier to play, it would only be valuable after a certain point in the game when you are just trying to discover all the species, etc.
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Why is it that if someone tells you that there are 1 billion stars in the universe you will believe them,
but if they tell you a wall has wet paint you will have to touch it to be sure?