Can the plants being able to grow some new leaves and flowers.
It would stop producing more when it reaches it limits.

Also when you prune the plants, instead of making the fallen leaves disappear into nothing, could the leaves fall on the floor so you can pick the fresh cutting up and plants them. You can clear the floor of excessive/dead leaves by simply clicking on Brush Tool.

I think some "flower" such as Citrus should not be on Flower Category, but in their own category called “Fruit”. You can cut fruits off the plants and sell them.