Gricoller's can is a reward from the Tithe Farm minigame released as part of the Phase 1 update, Great Kourend. Players who have obtained 100% favour with the Hosidius House may play Tithe Farm; afterwards, a player may exchange points for Gricoller's can.
Gricoller's can costs 200 points and acts exactly like a watering can except it holds 1,000 charges instead of 8 and can only be recharged by returning to Farmer Gricoller's reward shop. It costs 1 point for every 5% (50 uses), or 20 points if completely empty.
Players may find Tithe Farm easier using Gricoller's can because it removes the need to bring multiple watering cans and keep track of empty ones. On a perfect Tithe Farm run (all 100 fruits grown), the can will lose exactly 30% of its charges, which costs 6 points to recharge. This means Gricoller's can is less efficient compared to using regular watering cans.
The tool leprechaun is able to store Gricoller's can in the watering can slot.