Flamestrike and Death and Decay not destroying trees

Yeah, like the topic says, how can I let Flamestrike and Death and Decay not destroy trees? I dont want to turn them into 'fake' trees since I might need interaction with them later.

Some targets are hardcoded. If removing Tree from the Allowed Targets doesn't work, then you can change how the trees are targeted (i.e. targeted as None). If you don't want to change the trees, maybe you want to consider using other spells like Blizzard, Healing Spray, or Cluster Rockets for your AoE damage.

Changing the target type of the trees also made them uninteractable. And I used Flamestrike and DnD for their specific effects. Well, perhaps I wont need interaction with trees.
Thanks for the help.