Build planner
Farming at level 20
The setup that gathers the most at your level, from everything on the wiki: judged by how long each gather takes, the chance it succeeds and the drops it gives, at the node you pick. Put your own piece in any slot and the planner builds the rest around it; save it to keep it and share it.
Tool
Its power decides which nodes you can gather: 8 reaches everything up to the Sugarcane Field
Why: Wheat Field needs only power 1, and this build reaches the limit there, so Rootpicker's luck counts for more than more efficiency.
Other pick: Vinesweeper (Lv 7: 11 efficiency, no luck; 10% less a minute here)
Armour and accessories
One of each; rings twice
Why: The only helmet on the wiki that helps Farming. Past the limit at the Wheat Field it adds nothing; it counts on stronger nodes.
No chestplate, leggings or boots on the wiki help Farming. Wear your combat set.
Why: The most efficiency any gloves give. Past the limit at the Wheat Field it adds nothing; it counts on stronger nodes.
Other pick: Gardening Gloves (Lv 4: 7.5% efficiency; about the same here)
Why: The most luck an amulet gives here. Luck is a chance of a second drop on each gather.
Other pick: Rookie Farmer Amulet (Lv 10: 7.5% XP, no luck; 10% less a minute here)
No ring or greaves on the wiki help Farming.
Pet, elixir and food
Why: +5% Farming XP. A pet's own bonus counts in full: we don't have data on which pet tier unlocks it.
+5 Farming Efficiency, added to the flat total. Permanent. Counted at its top level: it isn't in your elixirs yet.
+49.5% Farming Efficiency and +22.5% Farming XP for 3 hours. Each star adds 10%.
Guild and collections
Not countedYour guild's upgrades and your collections add efficiency and XP, but the planner can't know yours. Turn them on to count them.
The Wheat Field: its page, with its drops and where it is.