Only the Sickle purchased from the Merchant can be used to harvest Hay. The Ice Sickle and Death Sickle do not work.
Dicas[]
Since it is so fast and easy to obtain, it makes for an excellent building block for large-scale projects, e.g. a skybridge. It is also immune to biome spread (i.e., Hallow/Corruption/Crimson).
Using the Flower Boots, the player can repeatedly swing a Sickle for very large amounts of Hay.