Huh. I used a completely different tactic. I lured both plants to a path through the forest that they couldn't pass through. They kept trying but were stuck. Meanwhile, I was far enough away that they couldn't destroy me with their spells, yet was still within my own spell range. I cast Burning Haze on them until they both just quietly expired.
No loss of hit points whatsoever. The game balance worked for me just fine...
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