Feat: Stem the Tide
You can cast Protector Tree as a 1st-rank primal innate spell once per day. At 7th level, the spell is heightened to 2nd rank, and every 2 levels thereafter, the spell is heightened an additional spell rank.
Pathfinder 2e Database
You can cast Protector Tree as a 1st-rank primal innate spell once per day. At 7th level, the spell is heightened to 2nd rank, and every 2 levels thereafter, the spell is heightened an additional spell rank.