Onion seeds are a Summer crop can be bought from the General Store and take 8 days to grow. They can be sold in a Shipment Box for 80 G each and therefore 720 G can be obtained per harvest of 9 crops.
It is possible to get 580 G profit per harvest, and assuming crops are replanted as soon as they are harvested, up to 2160 G (1740 G profit) can be obtained each season.
NPCs
Abii • Ashlee •Brandon •Candice •Cloe •Danieru •Fenn •Granny Katlin •Jade •Jakob •Jenni •Jim •Johan •Liara •Mayor Jeimmi •Tiberius •Tomas •Yulif •Harvest Goddess
Buildings
Animal Ranch •Cafe •Carpenter's Hut •Church •Clockmaker •Fishing Hole •Fishing Hut •General Store •Goddess Pond •Mining Hill •Mining Hut •Poultry Farm •The Blacksmith •Townhall
Crops
Beetroot Cabbage Carrot Corn Cucumber Eggplant Grass Green Pepper •Industrial Hemp Hardy Turnip Onion Pineapple Potato Pumpkin Spinach Strawberry Sweet Potato Tomato Turnip Watermelon Wheat
Animals
Chicken Cow Sheep Animal Fodder Animal Medicine Chicken Feed Chicken Treat Cow Treat Egg Feeding Tray Food Trough Incubator Milk Miracle Potion Nest Box Sheep Treat Treat Wool
Tools
Cooking