diff --git a/pl_seaweed/init.lua b/pl_seaweed/init.lua
index 49885d4..1171719 100644
--- a/pl_seaweed/init.lua
+++ b/pl_seaweed/init.lua
@@ -111,18 +111,34 @@ pl_seaweed.grow_seaweed = function(pos)
 	minetest.swap_node(right_here, {name=node_name, param2=math.random(1,3)})
 end
 
-biome_lib.register_on_generate({
-		surface = {"default:water_source"},
-		max_count = seaweed_max_count,
-		rarity = seaweed_rarity,
-		min_elevation = 1,
-		max_elevation = 40,
-		near_nodes = {"default:dirt_with_grass"},
-		near_nodes_size = 4,
-		near_nodes_vertical = 1,
-		near_nodes_count = 1,
-		plantlife_limit = -0.9,
+pl.register_on_generate({
+        place_on = {
+            "default:water_source"
+        },
+		noise_params = {
+			scale = 0.00234375,
+			offset = 0,
+			seed = 0,
+			octaves = 3,
+			lacunarity = 2,
+			flags = "absvalue",
+			spread = {
+				x = 100,
+				y = 100,
+				z = 100
+			},
+			persist = 0.6
+		},
+		flags = "all_floors",
+		y_min = 1,
+		y_max = 40,
+		near_nodes = {
+            "default:dirt_with_grass"
+        },
+        near_nodes_size = 1
 	},
+	"pl_seaweed:water_grass",
+	nil,
 	pl_seaweed.grow_seaweed
 )
 
diff --git a/plantlife_lib/init.lua b/plantlife_lib/init.lua
index 4c9619e..ea726bc 100644
--- a/plantlife_lib/init.lua
+++ b/plantlife_lib/init.lua
@@ -1,8 +1,10 @@
 pl = {}
 local deco = {}
 
+dofile(minetest.get_modpath("plantlife_lib") .. DIR_DELIM .. "util.lua")
+
 function pl.get_def_from_id(id)
-	for i, _ in pairs(deco) do
+	for i, _ in ipairs(deco) do
 		if deco[i][1].id and deco[i][1].id == id then
 			return deco[i]
 		end
@@ -20,25 +22,33 @@ function pl.register_on_generate(def, plantname, index, func)
 		noise_params = def.noise_params,
 		y_min = def.min_elevation,
 		y_max = def.max_elevation,
-		spawn_by = def.near_nodes,
-		num_spawn_by = def.near_nodes_count,
 		flags = def.flags,
 		decoration = "air",
-		near_nodes_size = def.near_nodes_size,
-		near_nodes_count = def.near_nodes_count,
 	}
+	-- handle near_nodes (we can't use the engine function for that)
+	if def.near_nodes then
+		deco_def.near_nodes = def.near_nodes
+		if def.near_nodes_size then
+			deco_def.near_nodes_size = def.near_nodes_size
+			if def.near_nodes_vertical then
+				deco_def.near_nodes_vertical = def.near_nodes_vertical
+			end
+		end
+		deco_def.near_nodes_count = def.near_nodes_count or 1
+	end
+	-- save def
 	local next = #deco + 1
 	deco[next] = {}
 	deco[next][1] = deco_def
 	deco[next][2] = func or nil
 	minetest.register_decoration(deco_def)
-	print(dump(deco))
+	-- print(dump(deco))
 end
 
 local ids = {}
 minetest.register_on_mods_loaded(function()
     -- print(dump(deco))
-    for k, v in pairs(deco) do
+    for k, v in ipairs(deco) do
 		local id = minetest.get_decoration_id(deco[k][1].name)
         deco[k][1].id = id
 		table.insert(ids, id)
@@ -51,7 +61,7 @@ end)
 local function place_handler(t)
 	local def = pl.get_def_from_id(t.id)
 	-- near nodes handler
-	if def.near_nodes_count and -- not tested yet
+	if def.near_nodes and
 		#minetest.find_nodes_in_area(
 			{x = t.pos.x-def.near_nodes_size, y = t.pos.y-def.near_nodes_vertical, z = t.pos.z-def.near_nodes_size},
 			{x = t.pos.x+def.near_nodes_size, y = t.pos.y+def.near_nodes_vertical, z = t.pos.z+def.near_nodes_size},
@@ -67,6 +77,7 @@ local function place_handler(t)
 	-- some fun
 	local player = minetest.get_player_by_name("Niklp")
 	-- player:set_pos(t.pos)
+	t.pos.y = t.pos.y + 3
 	minetest.add_particle({
 		pos = t.pos,
 		expirationtime = 15,
@@ -78,9 +89,10 @@ local function place_handler(t)
 end
 
 minetest.register_on_generated(function(minp, maxp, blockseed)
+	local t0 = minetest.get_us_time()
     local g = minetest.get_mapgen_object("gennotify")
     local locations = {}
-	for _, id in pairs(ids) do
+	for _, id in ipairs(ids) do
 		local deco_locations = g["decoration#" .. id] or {}
 		-- print("dl: " .. dump2(deco_locations))
 		for k, pos in pairs(deco_locations) do
@@ -93,10 +105,12 @@ minetest.register_on_generated(function(minp, maxp, blockseed)
 		end
 	end
     if #locations == 0 then return end
-	print("locations: " .. dump2(locations))
+	-- print("locations: " .. dump2(locations))
     for _, t in ipairs(locations) do
 		place_handler(t)
     end
+	local t1 = minetest.get_us_time()
+	print((t1 - t0) / 1000 .. " ms")
 end)
 
 --[[ Example plant
diff --git a/plantlife_lib/util.lua b/plantlife_lib/util.lua
new file mode 100644
index 0000000..7a77e91
--- /dev/null
+++ b/plantlife_lib/util.lua
@@ -0,0 +1,14 @@
+-- Biome lib util functions
+
+function pl.get_nodedef_field(nodename, fieldname)
+	if not minetest.registered_nodes[nodename] then
+		return nil
+	end
+	return minetest.registered_nodes[nodename][fieldname]
+end
+
+if minetest.get_modpath("unified_inventory") or not minetest.settings:get_bool("creative_mode") then
+	pl.expect_infinite_stacks = false
+else
+	pl.expect_infinite_stacks = true
+end
\ No newline at end of file
diff --git a/trunks/generating.lua b/trunks/generating.lua
index 8a63e4c..7d38e1a 100644
--- a/trunks/generating.lua
+++ b/trunks/generating.lua
@@ -169,19 +169,35 @@ biome_lib.register_on_generate({
 end
 
 if Twigs_on_water == true then
-biome_lib.register_on_generate({
-    surface = {"default:water_source"},
-    max_count = Twigs_on_water_Max_Count,
-    rarity = Twigs_on_water_Rarity,
-    min_elevation = 1,
-	max_elevation = 40,
-	near_nodes = {"group:tree"},
-	near_nodes_size = 3,
-	near_nodes_vertical = 1,
-	near_nodes_count = 1,
-    plantlife_limit = -0.9,
-  },
-  abstract_trunks.place_twig
+pl.register_on_generate({
+		place_on = {
+			"default:water_source"
+		},
+		noise_params = {
+			flags = "absvalue",
+			offset = 0,
+			scale = 0.05,
+			spread = {
+				z = 100,
+				x = 100,
+				y = 100
+			},
+			seed = 0,
+			octaves = 3,
+			lacunarity = 2,
+			persist = 0.6
+		},
+		flags = "all_floors",
+		y_min = 1,
+		y_max = 40,
+		near_nodes = {"group:tree"},
+		near_nodes_size = 3,
+		near_nodes_vertical = 1,
+		near_nodes_count = 1
+	},
+	"trunks:on_water",
+	nil,
+	abstract_trunks.place_twig
 )
 end
 
@@ -356,24 +372,43 @@ abstract_trunks.grow_moss_on_ground = function(pos)
 
 end
 
-biome_lib.register_on_generate({
-    surface = {"default:dirt_with_grass"},
-    max_count = Moss_on_ground_Max_Count,
-    rarity = Moss_on_ground_Rarity,
-    min_elevation = 1,
-	max_elevation = 40,
-	near_nodes = {
-		"group:tree",
-		"ferns:fern_03",
-		"ferns:fern_02",
-		"ferns:fern_01"
+pl.register_on_generate({
+        y_max = 40,
+        flags = "all_floors",
+        deco_type = "simple",
+        place_on = {
+			"default:dirt_with_grass"
+        },
+        noise_params = {
+			offset = 0,
+			scale = 0.1,
+			persist = 0.6,
+			seed = 0,
+			octaves = 3,
+			lacunarity = 2,
+			flags = "absvalue",
+			spread = {
+				x = 100,
+				y = 100,
+				z = 100
+			}
+        },
+        flags = "all_floors",
+		y_min = 1, 
+		y_max = 40,
+		near_nodes = {
+			"group:tree",
+			"ferns:fern_03",
+			"ferns:fern_02",
+			"ferns:fern_01"
+		},
+		near_nodes_size = 2,
+		near_nodes_vertical = 1,
+		near_nodes_count = 1
 	},
-	near_nodes_size = 2,
-	near_nodes_vertical = 1,
-	near_nodes_count = 1,
-    plantlife_limit = -0.9,
-  },
-  abstract_trunks.grow_moss_on_ground
+	"trunks:on_dirt_with_grass",
+	nil,
+	abstract_trunks.grow_moss_on_ground
 )
 end
 
diff --git a/woodsoils/generating.lua b/woodsoils/generating.lua
index 9af10f9..803cb02 100644
--- a/woodsoils/generating.lua
+++ b/woodsoils/generating.lua
@@ -73,25 +73,41 @@ abstract_woodsoils.place_soil = function(pos)
 	end
 end
 
-biome_lib.register_on_generate({
-    surface = {
-		"group:tree",
-		"ferns:fern_03",
-		"ferns:fern_02",
-		"ferns:fern_01"
+pl.register_on_generate({
+		place_on = {
+			"group:tree",
+			"ferns:fern_03",
+			"ferns:fern_02",
+			"ferns:fern_01"
+		},
+        noise_params = {
+			flags = "absvalue",
+			offset = 0,
+			scale = 0.15625,
+			spread = {
+				x = 100,
+				y = 100,
+				z = 100
+			},
+			seed = 0,
+			octaves = 3,
+			persist = 0.6,
+			lacunarity = 2
+        },
+		flags = "all_floors,force_placement",
+		y_min = 1,
+        y_max = 40,
+		near_nodes = {
+			"group:tree",
+			"ferns:fern_03",
+			"ferns:fern_02",
+			"ferns:fern_01"
+		},
+        near_nodes_count = 4
 	},
-    max_count = 1000,
-    rarity = 1,
-    min_elevation = 1,
-	max_elevation = 40,
-	near_nodes = {"group:tree","ferns:fern_03","ferns:fern_02","ferns:fern_01"},
-	near_nodes_size = 5,
-	near_nodes_vertical = 1,
-	near_nodes_count = 4,
-    plantlife_limit = -1,
-    check_air = false,
-  },
-  "abstract_woodsoils.place_soil"
+	"woodsoils:place_soil",
+	nil,
+	abstract_woodsoils.place_soil
 )
 
 pl.register_on_generate({