Procedural foliage spawner questions

ok so im using the procedural foliage spawner to spawn foliage

that part all works well my tress spawn it looks great.

my question is how do i get them to respawn or do they respawn on there own?

basicly what i do is when i intereact with it is i spawn a actor in its place and then that actor dies or is gathered by the player,.

for some reason the foliage never comes back how do i make it respawn at runtime