Mods in den Spieleordner reingeschoben. So richtig tief.

mods/farming/crops/blackberry.lua

@@ -61,9 +61,9 @@ def.groups.growing = nil
 def.selection_box = farming.select_final
 def.drop = {
 	items = {
-		{items = {'farming:blackberry 2'}, rarity = 1},
-		{items = {'farming:blackberry'}, rarity = 2},
-		{items = {'farming:blackberry'}, rarity = 3},
+		{items = {"farming:blackberry 2"}, rarity = 1},
+		{items = {"farming:blackberry"}, rarity = 2},
+		{items = {"farming:blackberry"}, rarity = 3},
 	}
 }
 minetest.register_node("farming:blackberry_4", table.copy(def))
@@ -79,4 +79,21 @@ farming.registered_plants["farming:blackberry"] = {
 }
 
 -- mapgen
-farming.register_decoration("blackberry",4)
+
+minetest.register_decoration({
+	deco_type = "simple",
+	place_on = {
+		"default:dirt_with_grass", "mcl_core:dirt_with_grass", "ethereal:prairie_dirt"
+	},
+	sidelen = 16,
+	noise_params = {
+		offset = 0,
+		scale = farming.blackberry,
+		spread = {x = 100, y = 100, z = 100},
+		seed = 567,
+		octaves = 3,
+		persist = 0.6
+	},
+	y_min = 3, y_max = 20,
+	decoration = "farming:blackberry_4"
+})