Mods in den Spieleordner reingeschoben. So richtig tief.

mods/.farming_old/crops/spinach.lua

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+
+local S = minetest.get_translator("farming")
+
+-- item/seed
+
+minetest.register_craftitem("farming:spinach", {
+	description = S("Spinach"),
+	inventory_image = "farming_spinach.png",
+	groups = {compostability = 48, seed = 2, food_spinach = 1},
+	on_use = minetest.item_eat(1),
+
+	on_place = function(itemstack, placer, pointed_thing)
+		return farming.place_seed(itemstack, placer, pointed_thing, "farming:spinach_1")
+	end
+})
+
+farming.add_eatable("farming:spinach", 1)
+
+-- crop definition
+
+local def = {
+	description = S("Spinach") .. S(" Crop"),
+	drawtype = "plantlike",
+	tiles = {"farming_spinach_1.png"},
+	paramtype = "light",
+	sunlight_propagates = true,
+	waving = 1,
+	walkable = false,
+	buildable_to = true,
+	drop = "",
+	selection_box = farming.select,
+	groups = {
+		handy = 1, snappy = 3, flammable = 2, plant = 1, attached_node = 1,
+		not_in_creative_inventory = 1, growing = 1
+	},
+	_mcl_hardness = farming.mcl_hardness,
+	is_ground_content = false,
+	sounds = farming.node_sound_leaves_defaults()
+}
+
+-- stage 1
+
+minetest.register_node("farming:spinach_1", table.copy(def))
+
+-- stage 2
+
+def.tiles = {"farming_spinach_2.png"}
+minetest.register_node("farming:spinach_2", table.copy(def))
+
+-- stage 3
+
+def.tiles = {"farming_spinach_3.png"}
+def.drop = {
+	items = {
+		{items = {"farming:spinach"}, rarity = 1},
+		{items = {"farming:spinach"}, rarity = 3}
+	}
+}
+minetest.register_node("farming:spinach_3", table.copy(def))
+
+-- stage 4
+
+def.tiles = {"farming_spinach_4.png"}
+def.groups.growing = nil
+def.selection_box = farming.select_final
+def.drop = {
+	items = {
+		{items = {"farming:spinach 2"}, rarity = 1},
+		{items = {"farming:spinach 2"}, rarity = 2},
+		{items = {"farming:spinach 2"}, rarity = 3}
+	}
+}
+minetest.register_node("farming:spinach_4", table.copy(def))
+
+-- add to registered_plants
+
+farming.registered_plants["farming:spinach"] = {
+	crop = "farming:spinach",
+	seed = "farming:spinach",
+	minlight = 7,
+	maxlight = farming.max_light,
+	steps = 4
+}
+
+-- mapgen
+farming.register_decoration("spinach",4)