Polyculture
Very rare1.3%Ship 15 of each crop.
Ship 15 of each of the 28 standard-season crops - flowers, fruit trees, Ancient Fruit, Sweet Gem Berry and the Ginger Island exclusives all don't count, so don't burn effort there.
The list: Spring - Parsnip, Potato, Cauliflower, Green Bean, Kale, Garlic, Rhubarb (Desert seeds), Strawberry (Egg Festival seeds), Coffee Bean. Summer - Melon, Tomato, Blueberry, Hot Pepper, Wheat, Radish, Red Cabbage, Corn, Hops, Starfruit (Desert). Autumn - Pumpkin, Eggplant, Bok Choy, Yam, Cranberries, Beet (Desert), Amaranth, Grape, Artichoke.
Gotchas: Red Cabbage seeds are year-2 at Pierre's (or the Travelling Cart earlier), Strawberry seeds only at the Egg Festival (buy plenty), Coffee Beans from the cart or dust sprites, and remember to ship them - kegs and jars don't count. Plant 15+ of everything in its season and tick the checklist here as you go.