Add `compostability` to node definition group.

* mcl_cake/init.lua (cake);
* mcl_core/craftitems.lua (apple);
* mcl_core/nodes_base.lua (dirt with grass);
* mcl_core/nodes_cactuscane.lua (cactus, sugarcane);
* mcl_core/nodes_climb.lua (vines);
* mcl_core/nodes_trees.lua (leaves, saplings);
* mcl_dye/init.lua (cocoa beans);
* mcl_farming/beetroot.lua (beetroot, & seeds);
* mcl_farming/carrots.lua (carrot);
* mcl_farming/melon.lua (melon, & slice, & seeds);
* mcl_farming/potatoes.lua (potato, baked potato);
* mcl_farming/pumpkin.lua (pumpkin, carved &, & seeds, & pie);
* mcl_farming/wheat.lua (wheat, cookie, bread, hay block);
* mcl_flowers/init.lua (flowers, ferns, grass, & tall variants);
* mcl_mushrooms/small.lua (red and brown mushrooms);
* mcl_mushrooms/huge.lua (red and brown huge mushrooms);
* mcl_nether/init.lua (nether wart block);
* mcl_nether/nether_wart.lua (nether wart);
* mcl_ocean/kelp.lua (kelp, dried &, & block);
* mcl_ocean/sea_pickle.lua (sea pickle);
* mcl_ocean/seagrass.lua (seagrass).

mods/ITEMS/mcl_cake/init.lua

@@ -52,7 +52,10 @@ minetest.register_node("mcl_cake:cake", {
 		fixed = full_cake
 	},
 	stack_max = 1,
-	groups = {handy=1, cake=7, food=2,no_eat_delay=1, attached_node=1, dig_by_piston=1, comparator_signal=14},
+	groups = {
+		handy = 1, attached_node = 1, dig_by_piston = 1, comparator_signal = 14,
+		cake = 7, food = 2, no_eat_delay = 1, compostability = 100
+	},
 	drop = "",
 	on_rightclick = function(pos, node, clicker, itemstack)
 		-- Cake is subject to protection
@@ -125,7 +128,11 @@ local register_slice = function(level, nodebox, desc)
 			type = "fixed",
 			fixed = nodebox,
 			},
-		groups = {handy=1, cake=level, food=2,no_eat_delay=1,attached_node=1,not_in_creative_inventory=1,dig_by_piston=1,comparator_signal=level*2},
+		groups = {
+			handy = 1, attached_node = 1, not_in_creative_inventory = 1,
+			dig_by_piston = 1, cake = level, comparator_signal = level * 2,
+			food = 2, no_eat_delay = 1
+		},
 		drop = "",
 		on_rightclick = on_rightclick,
 		sounds = mcl_sounds.node_sound_leaves_defaults(),

mods/ITEMS/mcl_core/craftitems.lua

@@ -139,7 +139,7 @@ minetest.register_craftitem("mcl_core:apple", {
 	stack_max = 64,
 	on_place = minetest.item_eat(4),
 	on_secondary_use = minetest.item_eat(4),
-	groups = { food = 2, eatable = 4 },
+	groups = { food = 2, eatable = 4, compostability = 65 },
 	_mcl_saturation = 2.4,
 })
 

mods/ITEMS/mcl_core/nodes_base.lua

@@ -368,7 +368,12 @@ minetest.register_node("mcl_core:dirt_with_grass", {
 	color = "#8EB971",
 	is_ground_content = true,
 	stack_max = 64,
-	groups = {handy=1,shovely=1,dirt=2,grass_block=1, grass_block_no_snow=1, soil=1, soil_sapling=2, soil_sugarcane=1, cultivatable=2, spreading_dirt_type=1, enderman_takable=1, building_block=1},
+	groups = {
+		handy = 1, shovely = 1, dirt = 2, grass_block = 1, grass_block_no_snow = 1,
+		soil = 1, soil_sapling = 2, soil_sugarcane = 1, cultivatable = 2,
+		spreading_dirt_type = 1, enderman_takable = 1, building_block = 1,
+		compostability = 30
+	},
 	drop = "mcl_core:dirt",
 	sounds = mcl_sounds.node_sound_dirt_defaults({
 		footstep = {name="default_grass_footstep", gain=0.1},

mods/ITEMS/mcl_core/nodes_cactuscane.lua

@@ -12,7 +12,10 @@ minetest.register_node("mcl_core:cactus", {
 	tiles = {"mcl_core_cactus_top.png", "mcl_core_cactus_bottom.png", "mcl_core_cactus_side.png"},
 	is_ground_content = true,
 	stack_max = 64,
-	groups = {handy=1, attached_node=1, plant=1, deco_block=1, dig_by_piston=1, enderman_takable=1},
+	groups = {
+		handy = 1, attached_node = 1, deco_block = 1, dig_by_piston = 1,
+		plant = 1, enderman_takable = 1, compostability = 50
+	},
 	sounds = mcl_sounds.node_sound_wood_defaults(),
 	paramtype = "light",
 	sunlight_propagates = true,
@@ -79,7 +82,10 @@ minetest.register_node("mcl_core:reeds", {
 		},
 	},
 	stack_max = 64,
-	groups = {dig_immediate=3, craftitem=1, deco_block=1, plant=1, non_mycelium_plant=1, dig_by_piston=1},
+	groups = {
+		dig_immediate = 3, craftitem = 1, deco_block = 1, dig_by_piston = 1,
+		plant = 1, non_mycelium_plant = 1, compostability = 50
+	},
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 	node_placement_prediction = "",
 	drop = "mcl_core:reeds", -- to prevent color inheritation

mods/ITEMS/mcl_core/nodes_climb.lua

@@ -104,7 +104,11 @@ minetest.register_node("mcl_core:vine", {
 		type = "wallmounted",
 	},
 	stack_max = 64,
-	groups = {handy=1,axey=1,shearsy=1,swordy=1, flammable=2,deco_block=1,destroy_by_lava_flow=1,dig_by_piston=1, fire_encouragement=15, fire_flammability=100},
+	groups = {
+		handy = 1, axey = 1, shearsy = 1, swordy = 1, deco_block = 1,
+		dig_by_piston = 1, destroy_by_lava_flow = 1, compostability = 50,
+		flammable = 2, fire_encouragement = 15, fire_flammability = 100
+	},
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 	drop = "",
 	_mcl_shears_drop = true,

mods/ITEMS/mcl_core/nodes_trees.lua

@@ -152,17 +152,10 @@ local function register_leaves(subname, description, longdesc, tiles, sapling, d
 		paramtype = "light",
 		stack_max = 64,
 		groups = {
-			handy=1,
+			handy = 1, hoey = 1, shearsy = 1, swordy = 1, dig_by_piston = 1,
-			hoey=1,
+			leaves = 1, leafdecay = leafdecay_distance, deco_block = 1,
-			shearsy=1,
+			flammable = 2, fire_encouragement = 30, fire_flammability = 60,
-			swordy=1,
+			compostability = 30
-			leafdecay=leafdecay_distance,
-			flammable=2,
-			leaves=1,
-			deco_block=1,
-			dig_by_piston=1,
-			fire_encouragement=30,
-			fire_flammability=60
 		},
 		drop = get_drops(0),
 		_mcl_shears_drop = true,
@@ -194,7 +187,11 @@ local function register_sapling(subname, description, longdesc, tt_help, texture
 			fixed = selbox
 		},
 		stack_max = 64,
-		groups = {dig_immediate=3, plant=1,sapling=1,non_mycelium_plant=1,attached_node=1,dig_by_water=1,dig_by_piston=1,destroy_by_lava_flow=1,deco_block=1},
+		groups = {
+			plant = 1, sapling = 1, non_mycelium_plant = 1, attached_node = 1,
+			deco_block = 1, dig_immediate = 3, dig_by_water = 1, dig_by_piston = 1,
+			destroy_by_lava_flow = 1, compostability = 30
+		},
 		sounds = mcl_sounds.node_sound_leaves_defaults(),
 		on_construct = function(pos)
 			local meta = minetest.get_meta(pos)

mods/ITEMS/mcl_dye/init.lua

@@ -78,7 +78,7 @@ dyelocal.dyes = {
 	{"dark_green", "dye_dark_green",    S("Cactus Green"),{dye=1, craftitem=1, basecolor_green=1,   excolor_green=1,     unicolor_dark_green=1}},
 	{"green", "mcl_dye_lime",           S("Lime Dye"),     {dye=1, craftitem=1, basecolor_green=1,   excolor_green=1,     unicolor_green=1}},
 	{"yellow", "dye_yellow",            S("Dandelion Yellow"),    {dye=1, craftitem=1, basecolor_yellow=1,  excolor_yellow=1,    unicolor_yellow=1}},
-	{"brown", "mcl_dye_brown",          S("Cocoa Beans"),     {dye=1, craftitem=1, basecolor_brown=1,  excolor_orange=1,    unicolor_dark_orange=1}},
+	{"brown", "mcl_dye_brown",          S("Cocoa Beans"),     {dye=1, craftitem=1, basecolor_brown=1,  excolor_orange=1,    unicolor_dark_orange=1, compostability = 65}},
 	{"orange", "dye_orange",            S("Orange Dye"),    {dye=1, craftitem=1, basecolor_orange=1,  excolor_orange=1,    unicolor_orange=1}},
 	{"red", "dye_red",                  S("Rose Red"),       {dye=1, craftitem=1, basecolor_red=1,     excolor_red=1,       unicolor_red=1}},
 	{"magenta", "dye_magenta",          S("Magenta Dye"),   {dye=1, craftitem=1, basecolor_magenta=1, excolor_red_violet=1,unicolor_red_violet=1}},
@@ -561,5 +561,3 @@ minetest.register_craft({
 	output = "mcl_dye:white 3",
 	recipe = {{"mcl_mobitems:bone"}},
 })
-
-

mods/ITEMS/mcl_farming/beetroot.lua

@@ -5,7 +5,7 @@ minetest.register_craftitem("mcl_farming:beetroot_seeds", {
 	_tt_help = S("Grows on farmland"),
 	_doc_items_longdesc = S("Grows into a beetroot plant. Chickens like beetroot seeds."),
 	_doc_items_usagehelp = S("Place the beetroot seeds on farmland (which can be created with a hoe) to plant a beetroot plant. They grow in sunlight and grow faster on hydrated farmland. Rightclick an animal to feed it beetroot seeds."),
-	groups = { craftitem=1 },
+	groups = {craftitem = 1, compostability = 30},
 	inventory_image = "mcl_farming_beetroot_seeds.png",
 	wield_image = "mcl_farming_beetroot_seeds.png",
 	on_place = function(itemstack, placer, pointed_thing)
@@ -133,7 +133,7 @@ minetest.register_craftitem("mcl_farming:beetroot_item", {
 	wield_image = "mcl_farming_beetroot.png",
 	on_place = minetest.item_eat(1),
 	on_secondary_use = minetest.item_eat(1),
-	groups = { food = 2, eatable = 1 },
+	groups = {food = 2, eatable = 1, compostability = 65},
 	_mcl_saturation = 1.2,
 })
 

mods/ITEMS/mcl_farming/carrots.lua

@@ -86,7 +86,7 @@ minetest.register_craftitem("mcl_farming:carrot_item", {
 	_doc_items_longdesc = S("Carrots can be eaten and planted. Pigs and rabbits like carrots."),
 	_doc_items_usagehelp = S("Hold it in your hand and rightclick to eat it. Place it on top of farmland to plant the carrot. It grows in sunlight and grows faster on hydrated farmland. Rightclick an animal to feed it."),
 	inventory_image = "farming_carrot.png",
-	groups = { food = 2, eatable = 3 },
+	groups = {food = 2, eatable = 3, compostability = 65},
 	_mcl_saturation = 3.6,
 	on_secondary_use = minetest.item_eat(3),
 	on_place = function(itemstack, placer, pointed_thing)

mods/ITEMS/mcl_farming/melon.lua

@@ -7,7 +7,7 @@ minetest.register_craftitem("mcl_farming:melon_seeds", {
 	_doc_items_longdesc = S("Grows into a melon stem which in turn grows melons. Chickens like melon seeds."),
 	_doc_items_usagehelp = S("Place the melon seeds on farmland (which can be created with a hoe) to plant a melon stem. Melon stems grow in sunlight and grow faster on hydrated farmland. When mature, the stem will attempt to grow a melon at the side. Rightclick an animal to feed it melon seeds."),
 	stack_max = 64,
-	groups = { craftitem=1 },
+	groups = {craftitem = 1, compostability = 30},
 	inventory_image = "mcl_farming_melon_seeds.png",
 	on_place = function(itemstack, placer, pointed_thing)
 		return mcl_farming:place_seed(itemstack, placer, pointed_thing, "mcl_farming:melontige_1")
@@ -21,7 +21,10 @@ local melon_base_def = {
 	_doc_items_longdesc = S("A melon is a block which can be grown from melon stems, which in turn are grown from melon seeds. It can be harvested for melon slices."),
 	stack_max = 64,
 	tiles = {"farming_melon_top.png", "farming_melon_top.png", "farming_melon_side.png", "farming_melon_side.png", "farming_melon_side.png", "farming_melon_side.png"},
-	groups = {handy=1,axey=1, plant=1,building_block=1,enderman_takable=1,dig_by_piston=1},
+	groups = {
+		handy = 1, axey = 1, plant = 1, building_block = 1, dig_by_piston = 1,
+		enderman_takable = 1, compostability = 65
+	},
 	drop = {
 		max_items = 1,
 		items = {
@@ -134,7 +137,7 @@ minetest.register_craftitem("mcl_farming:melon_item", {
 	inventory_image = "farming_melon.png",
 	on_place = minetest.item_eat(2),
 	on_secondary_use = minetest.item_eat(2),
-	groups = { food = 2, eatable = 2 },
+	groups = {food = 2, eatable = 2, compostability = 50},
 	_mcl_saturation = 1.2,
 })
 

mods/ITEMS/mcl_farming/potatoes.lua

@@ -91,7 +91,7 @@ minetest.register_craftitem("mcl_farming:potato_item", {
 	_doc_items_longdesc = S("Potatoes are food items which can be eaten, cooked in the furnace and planted. Pigs like potatoes."),
 	_doc_items_usagehelp = S("Hold it in your hand and rightclick to eat it. Place it on top of farmland to plant it. It grows in sunlight and grows faster on hydrated farmland. Rightclick an animal to feed it."),
 	inventory_image = "farming_potato.png",
-	groups = { food = 2, eatable = 1 },
+	groups = {food = 2, eatable = 1, compostability = 65},
 	_mcl_saturation = 0.6,
 	stack_max = 64,
 	on_secondary_use = minetest.item_eat(1),
@@ -112,7 +112,7 @@ minetest.register_craftitem("mcl_farming:potato_item_baked", {
 	inventory_image = "farming_potato_baked.png",
 	on_place = minetest.item_eat(5),
 	on_secondary_use = minetest.item_eat(5),
-	groups = { food = 2, eatable = 5 },
+	groups = {food = 2, eatable = 5, compostability = 85},
 	_mcl_saturation = 6.0,
 })
 

mods/ITEMS/mcl_farming/pumpkin.lua

@@ -15,7 +15,7 @@ minetest.register_craftitem("mcl_farming:pumpkin_seeds", {
 	_doc_items_usagehelp = S("Place the pumpkin seeds on farmland (which can be created with a hoe) to plant a pumpkin stem. Pumpkin stems grow in sunlight and grow faster on hydrated farmland. When mature, the stem attempts to grow a pumpkin next to it. Rightclick an animal to feed it pumpkin seeds."),
 	stack_max = 64,
 	inventory_image = "mcl_farming_pumpkin_seeds.png",
-	groups = { craftitem=1 },
+	groups = {craftitem=1, compostability = 30},
 	on_place = function(itemstack, placer, pointed_thing)
 		return mcl_farming:place_seed(itemstack, placer, pointed_thing, "mcl_farming:pumpkin_1")
 	end
@@ -99,7 +99,10 @@ local pumpkin_base_def = {
 	stack_max = 64,
 	paramtype2 = "facedir",
 	tiles = {"farming_pumpkin_top.png", "farming_pumpkin_top.png", "farming_pumpkin_side.png"},
-	groups = {handy=1,axey=1, plant=1,building_block=1, dig_by_piston=1, enderman_takable=1},
+	groups = {
+		handy = 1, axey = 1, plant = 1, building_block = 1, dig_by_piston = 1,
+		enderman_takable = 1, compostability = 65
+	},
 	sounds = mcl_sounds.node_sound_wood_defaults(),
 	on_rotate = on_rotate,
 	_mcl_blast_resistance = 1,
@@ -230,7 +233,7 @@ minetest.register_craftitem("mcl_farming:pumpkin_pie", {
 	wield_image = "mcl_farming_pumpkin_pie.png",
 	on_place = minetest.item_eat(8),
 	on_secondary_use = minetest.item_eat(8),
-	groups = { food = 2, eatable = 8 },
+	groups = {food = 2, eatable = 8, compostability = 100},
 	_mcl_saturation = 4.8,
 })
 

mods/ITEMS/mcl_farming/wheat.lua

@@ -9,7 +9,7 @@ minetest.register_craftitem("mcl_farming:wheat_seeds", {
 		Place the wheat seeds on farmland (which can be created with a hoe) to plant a wheat plant.
 		They grow in sunlight and grow faster on hydrated farmland. Rightclick an animal to feed it wheat seeds.
 	]]),
-	groups = { craftitem=1 },
+	groups = {craftitem = 1, compostability = 30},
 	inventory_image = "mcl_farming_wheat_seeds.png",
 	on_place = function(itemstack, placer, pointed_thing)
 		return mcl_farming:place_seed(itemstack, placer, pointed_thing, "mcl_farming:wheat_1")
@@ -104,7 +104,7 @@ minetest.register_craftitem("mcl_farming:wheat_item", {
 	_doc_items_longdesc = S("Wheat is used in crafting. Some animals like wheat."),
 	_doc_items_usagehelp = S("Use the “Place” key on an animal to try to feed it wheat."),
 	inventory_image = "farming_wheat_harvested.png",
-	groups = { craftitem = 1 },
+	groups = {craftitem = 1, compostability = 65},
 })
 
 minetest.register_craft({
@@ -125,7 +125,7 @@ minetest.register_craftitem("mcl_farming:cookie", {
 	description = S("Cookie"),
 	_doc_items_longdesc = S("This is a food item which can be eaten."),
 	inventory_image = "farming_cookie.png",
-	groups = {food=2, eatable=2},
+	groups = {food = 2, eatable = 2, compostability = 85},
 	_mcl_saturation = 0.4,
 	on_place = minetest.item_eat(2),
 	on_secondary_use = minetest.item_eat(2),
@@ -136,7 +136,7 @@ minetest.register_craftitem("mcl_farming:bread", {
 	description = S("Bread"),
 	_doc_items_longdesc = S("This is a food item which can be eaten."),
 	inventory_image = "farming_bread.png",
-	groups = {food=2, eatable=5},
+	groups = {food = 2, eatable = 5, compostability = 85},
 	_mcl_saturation = 6.0,
 	on_place = minetest.item_eat(5),
 	on_secondary_use = minetest.item_eat(5),
@@ -156,8 +156,11 @@ minetest.register_node("mcl_farming:hay_block", {
 	stack_max = 64,
 	paramtype2 = "facedir",
 	on_place = mcl_util.rotate_axis,
-	groups = {handy=1, hoey=1, flammable=2, fire_encouragement=60,
+	groups = {
-		fire_flammability=20, building_block=1, fall_damage_add_percent=-80},
+		handy = 1, hoey = 1, building_block = 1, fall_damage_add_percent = -80,
+		flammable = 2, fire_encouragement = 60, fire_flammability = 20,
+		compostability = 85
+	},
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 	on_rotate = on_rotate,
 	_mcl_blast_resistance = 0.5,

mods/ITEMS/mcl_flowers/init.lua

@@ -80,7 +80,13 @@ function mcl_flowers.register_simple_flower(name, def)
 		walkable = false,
 		stack_max = 64,
 		drop = def.drop,
-		groups = {dig_immediate=3,flammable=2,fire_encouragement=60,fire_flammability=100,plant=1,flower=1,place_flowerlike=1,non_mycelium_plant=1,attached_node=1,dig_by_water=1,destroy_by_lava_flow=1,dig_by_piston=1,enderman_takable=1,deco_block=1},
+		groups = {
+			attached_node = 1, deco_block = 1, dig_by_piston = 1, dig_immediate = 3,
+			dig_by_water = 1, destroy_by_lava_flow = 1, enderman_takable = 1,
+			plant = 1, flower = 1, place_flowerlike = 1, non_mycelium_plant = 1,
+			flammable = 2, fire_encouragement = 60, fire_flammability = 100,
+			compostability = 65
+		},
 		sounds = mcl_sounds.node_sound_leaves_defaults(),
 		node_placement_prediction = "",
 		on_place = on_place_flower,
@@ -143,7 +149,12 @@ local def_tallgrass = {
 	walkable = false,
 	buildable_to = true,
 	is_ground_content = true,
-	groups = {handy=1,shearsy=1, flammable=3,fire_encouragement=60,fire_flammability=100,attached_node=1,plant=1,place_flowerlike=2,non_mycelium_plant=1,dig_by_water=1,destroy_by_lava_flow=1,deco_block=1},
+	groups = {
+		handy = 1, shearsy = 1, attached_node = 1, deco_block = 1,
+		plant = 1, place_flowerlike = 2, non_mycelium_plant = 1,
+		flammable = 3, fire_encouragement = 60, fire_flammability = 100,
+		dig_by_water = 1, destroy_by_lava_flow = 1, compostability = 30
+	},
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 	drop = wheat_seed_drop,
 	_mcl_shears_drop = true,
@@ -167,6 +178,7 @@ def_fern.selection_box = {
 	type = "fixed",
 	fixed = { -6/16, -0.5, -6/16, 6/16, 5/16, 6/16 },
 }
+def_fern.groups.compostability = 65
 
 minetest.register_node("mcl_flowers:fern", def_fern)
 
@@ -187,7 +199,15 @@ local function add_large_plant(name, desc, longdesc, bottom_img, top_img, inv_im
 		is_flower = true
 	end
 
-	local bottom_groups = {flammable=2, fire_encouragement=60, fire_flammability=100, non_mycelium_plant=1, attached_node=1, dig_by_water=1, destroy_by_lava_flow=1, dig_by_piston=1, plant=1, double_plant=1, deco_block=1}
+	local bottom_groups = {
+		attached_node = 1, deco_block = 1,
+		dig_by_water = 1, destroy_by_lava_flow = 1, dig_by_piston = 1,
+		flammable = 2, fire_encouragement = 60, fire_flammability = 100,
+		plant = 1, double_plant = 1, non_mycelium_plant = 1, compostability = 65
+	}
+	if name == "double_grass" then
+		bottom_groups.compostability = 50
+	end
 	if is_flower then
 		bottom_groups.flower = 1
 		bottom_groups.place_flowerlike = 1
@@ -410,7 +430,10 @@ minetest.register_node("mcl_flowers:waterlily", {
 	liquids_pointable = true,
 	walkable = true,
 	sunlight_propagates = true,
-	groups = {dig_immediate = 3, plant=1, dig_by_water = 1,destroy_by_lava_flow=1, dig_by_piston = 1, deco_block=1, dig_by_boat=1},
+	groups = {
+		deco_block = 1, plant = 1, compostability = 65, destroy_by_lava_flow = 1,
+		dig_immediate = 3, dig_by_water = 1, dig_by_piston = 1, dig_by_boat = 1,
+	},
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 	node_placement_prediction = "",
 	node_box = {

mods/ITEMS/mcl_mushrooms/huge.lua

@@ -3,7 +3,10 @@ local S = minetest.get_translator(minetest.get_current_modname())
 local vector = vector
 
 local template = {
-	groups = {handy=1,axey=1, building_block = 1, material_wood = 1, flammable = -1 },
+	groups = {
+		handy = 1, axey = 1, building_block = 1, material_wood = 1,
+		flammable = -1, compostability = 85
+	},
 	sounds = mcl_sounds.node_sound_wood_defaults(),
 	is_ground_content = true,
 	_mcl_blast_resistance = 0.2,
@@ -51,6 +54,7 @@ local function register_mushroom(color, species_id, template, d_cap, d_stem, d_s
 	stem_full.tiles = { "mcl_mushrooms_mushroom_block_skin_stem.png" }
 	stem_full.groups.huge_mushroom = species_id
 	stem_full.groups.huge_mushroom_stem = 2
+	stem_full.groups.compostability = 65
 	minetest.register_node("mcl_mushrooms:"..color.."_mushroom_block_stem_full", stem_full)
 
 	-- Stem
@@ -60,6 +64,7 @@ local function register_mushroom(color, species_id, template, d_cap, d_stem, d_s
 	stem.tiles = { "mcl_mushrooms_mushroom_block_inside.png", "mcl_mushrooms_mushroom_block_inside.png", "mcl_mushrooms_mushroom_block_skin_stem.png" }
 	stem.groups.huge_mushroom = species_id
 	stem.groups.huge_mushroom_stem = 1
+	stem.groups.compostability = 65
 	minetest.register_node("mcl_mushrooms:"..color.."_mushroom_block_stem", stem)
 
 	-- Mushroom block (cap)

mods/ITEMS/mcl_mushrooms/small.lua

@@ -38,7 +38,11 @@ minetest.register_node("mcl_mushrooms:mushroom_brown", {
 	sunlight_propagates = true,
 	paramtype = "light",
 	walkable = false,
-	groups = {dig_immediate=3,mushroom=1,attached_node=1,dig_by_water=1,destroy_by_lava_flow=1,dig_by_piston=1,enderman_takable=1,deco_block=1},
+	groups = {
+		attached_node = 1, deco_block = 1, destroy_by_lava_flow = 1,
+		dig_immediate = 3, dig_by_water = 1, dig_by_piston = 1,
+		mushroom = 1, enderman_takable = 1, compostability = 65
+	},
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 	light_source = 1,
 	selection_box = {
@@ -62,7 +66,11 @@ minetest.register_node("mcl_mushrooms:mushroom_red", {
 	sunlight_propagates = true,
 	paramtype = "light",
 	walkable = false,
-	groups = {dig_immediate=3,mushroom=1,attached_node=1,dig_by_water=1,destroy_by_lava_flow=1,dig_by_piston=1,enderman_takable=1,deco_block=1},
+	groups = {
+		attached_node = 1, deco_block = 1, destroy_by_lava_flow = 1,
+		dig_immediate = 3, dig_by_water = 1, dig_by_piston = 1,
+		mushroom = 1, enderman_takable = 1, compostability = 65
+	},
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 	selection_box = {
 		type = "fixed",

mods/ITEMS/mcl_nether/init.lua

@@ -174,7 +174,7 @@ minetest.register_node("mcl_nether:nether_wart_block", {
 	stack_max = 64,
 	tiles = {"mcl_nether_nether_wart_block.png"},
 	is_ground_content = false,
-	groups = {handy=1, hoey=1, building_block=1},
+	groups = {handy=1, hoey=1, building_block=1, compostability = 85},
 	sounds = mcl_sounds.node_sound_leaves_defaults(
 		{
 			footstep={name="default_dirt_footstep", gain=0.7},

mods/ITEMS/mcl_nether/nether_wart.lua

@@ -110,6 +110,7 @@ minetest.register_craftitem("mcl_nether:nether_wart_item", {
 	_doc_items_usagehelp = S("Place this item on soul sand to plant it and watch it grow."),
 	inventory_image = "mcl_nether_nether_wart.png",
 	wield_image = "mcl_nether_nether_wart.png",
+	groups = {craftitem = 1, brewitem = 1, compostability = 30},
 	on_place = function(itemstack, placer, pointed_thing)
 		if pointed_thing.type ~= "node" then
 			return itemstack
@@ -143,7 +144,6 @@ minetest.register_craftitem("mcl_nether:nether_wart_item", {
 			end
 		end
 	end,
-	groups = { craftitem = 1, brewitem=1 },
 })
 
 local names = {"mcl_nether:nether_wart_0", "mcl_nether:nether_wart_1", "mcl_nether:nether_wart_2"}

mods/ITEMS/mcl_ocean/kelp.lua

@@ -741,7 +741,7 @@ minetest.register_craftitem("mcl_ocean:kelp", {
 	inventory_image = "mcl_ocean_kelp_item.png",
 	wield_image = "mcl_ocean_kelp_item.png",
 	on_place = kelp.kelp_on_place,
-	groups = { deco_block = 1 },
+	groups = {deco_block = 1, compostability = 30},
 })
 
 if mod_doc then
@@ -756,7 +756,7 @@ minetest.register_craftitem("mcl_ocean:dried_kelp", {
 	_doc_items_longdesc = S("Dried kelp is a food item."),
 	inventory_image = "mcl_ocean_dried_kelp.png",
 	wield_image = "mcl_ocean_dried_kelp.png",
-	groups = { food = 2, eatable = 1 },
+	groups = {food = 2, eatable = 1, compostability = 30},
 	on_place = minetest.item_eat(1),
 	on_secondary_use = minetest.item_eat(1),
 	_mcl_saturation = 0.6,
@@ -773,7 +773,10 @@ minetest.register_node("mcl_ocean:dried_kelp_block", {
 	description = S("Dried Kelp Block"),
 	_doc_items_longdesc = S("A decorative block that serves as a great furnace fuel."),
 	tiles = { "mcl_ocean_dried_kelp_top.png", "mcl_ocean_dried_kelp_bottom.png", "mcl_ocean_dried_kelp_side.png" },
-	groups = { handy = 1, hoey = 1, building_block = 1, flammable = 2, fire_encouragement = 30, fire_flammability = 60 },
+	groups = {
+		handy = 1, hoey = 1, building_block = 1, compostability = 50,
+		flammable = 2, fire_encouragement = 30, fire_flammability = 60
+	},
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 	paramtype2 = "facedir",
 	on_place = mcl_util.rotate_axis,

mods/ITEMS/mcl_ocean/sea_pickle.lua

@@ -106,7 +106,10 @@ for s=1,4 do
 		},
 		inventory_image = img,
 		wield_image = img,
-		groups = { dig_immediate = 3, deco_block = 1, sea_pickle=1, not_in_creative_inventory=nici },
+		groups = {
+			dig_immediate = 3, deco_block = 1, sea_pickle = 1,
+			not_in_creative_inventory=nici, compostability = 65
+		},
 		-- Light level: 6 at size 1, +3 for each additional stage
 		light_source = math.min(6 + (s-1)*3, minetest.LIGHT_MAX),
 		selection_box = {

mods/ITEMS/mcl_ocean/seagrass.lua

@@ -85,7 +85,7 @@ minetest.register_craftitem("mcl_ocean:seagrass", {
 	inventory_image = "mcl_ocean_seagrass.png^[verticalframe:12:0",
 	wield_image = "mcl_ocean_seagrass.png^[verticalframe:12:0",
 	on_place = seagrass_on_place,
-	groups = { deco_block = 1 },
+	groups = {deco_block = 1, compostability = 30},
 })
 
 -- Seagrass nodes: seagrass on a surface node