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Thorns convert Regrow Bloons into normal Bloons.
~ In-game description


Heart of Oak is the second upgrade in the middle path for the Druid in BTD6 . Heart of Oak allows the Druid's thorns to strip Regrowth Bloons of their regrow property. It costs $295 on Easy, $350 on Medium, $380 on Hard and $420 on Impoppable.

TipsEdit

  • A Monkey Knowledge upgrade named Warm Oak reduces the price of this upgrade by $100. Note that this applies after difficulty price multipliers.
    • The same Monkey Knowledge can be used to make it easier to farm with Jungle's Bounty Druids.

GalleryEdit

TriviaEdit

  • Heart of Oak, similar to Counter-Espionage and Perishing Potions, removes one specific bloon property type from bloons. Coincidentally, all of these upgrades come from Magic Monkeys (Druid, Ninja, Alchemist, in the respective order).
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