at lv.36 it learns ancient power then it will evolve.
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Tangela > level up while knowing Ancientpower > Tangrowth
It can evolve as early as Level 33 in Pokemon Diamond, Pearl, Platinum, HeartGold and SoulSilver but it needs to know the move AncientPower.
Tangela does not evolve in Fire Red.
tangela evolves when it learns the move ancient power then you get tangrowth... :D
Tangela > level up while knowing Ancientpower > Tangrowth