Hexberry

The Hexberry is an exclusive rare crop with one of the busiest type-tag lists in the game: it counts as Magical, Berry, Spooky, Night, Sour and Fruit all at once. That stacking is the whole economic story here. Because no seed cost or fixed sell price is listed, treat Hexberry as an event-locked asset whose value comes from how many type-targeted buffs and quests it can satisfy simultaneously rather than from a clean cost-to-revenue ratio.

In practice the six overlapping types make Hexberry unusually flexible: any pet, tool, or event multiplier aimed at Berry, Night, or Spooky crops will land on it, so it pulls weight during Halloween-style night cycles when those modifiers are active. For mutation stacking, lean into the Spooky/Night identity — Moonlit and Chilled-class mutations apply during the same night windows you'd be harvesting it, and a fruit base accepts the high-value growth mutations cleanly.

Progression-wise, Hexberry is not a beginner buy: with no reliable shop price it only enters your garden through limited rotations, so grow it when you already have night-focused pets and mutation tools online to exploit every one of its tags at once.