Auto Stuff Respawning Within Game Setup Help

Yo guys!.

So I wanted to Know how i can setup so my stuff such as rocks and trees to Respawn after they are broken and a person is not in range together with time it will take to respawn.

I Will Also Use The Engine’s Procedural Foliage To Produce the Stuff BTW. so is there something that can done to The Procedural Foliage Generator to do it automatically?