How to create interactive foilage? Cuttable/Regrowable grass and trees

Development Programming & Scripting C++
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1

What is the theory behind making grass that you can cut and will grow back after some time and trees which you can chop down and remove the stumps?

Basically I would like to know what things I need to use and do to create plants that have various states of existence and remove them altogether.

Thanks for any help.

2

I’m really not sure about this, but I think you can make something similair with morph target.