Removing debris won't work. The trees still get destroyed. Though I will try Accname's method.
EDIT: Omg, Accname, you've saved me again! It works! +rep to you, this is the second time you've saved me. EDIT2: Sorry, I can't yet. But I will once I can.
If you didn't want to take the invulnerable trees route you could always make a trigger.
Event - destructible dies
Condition - destructible is equal to tree(whatever kind ur using)
Action - Instantly regenerate Event response - triggering unit
I'm at work right now(and not looking at WE) so that might not be exactly how it would work, but it would be something like that.
I'm on a page about incorrect corrections, and spent the better part of like two hours trying to get someone to understand that -5^2 = -25, not 25, and then that post had comments get reposted because that group is self sustaining, and that person was in turn trying to explain what I just explained to them. And I'm taking that as a victory
I will be AFK for a couple of days you guys hold down the fort while I am gone. I will be checking in on my phone but that will severly limit me. Be back saturday!