diff --git a/plants_lib/init.lua b/plants_lib/init.lua
index c68f7e6..6fbff0f 100644
--- a/plants_lib/init.lua
+++ b/plants_lib/init.lua
@@ -11,7 +11,7 @@
 
 plantslib = {}
 
-local DEBUG = false --... except if you want to spam the console with debugging info :-)
+local DEBUG = true --... except if you want to spam the console with debugging info :-)
 
 plantslib.plantlife_seed_diff = 329	-- needs to be global so other mods can see it
 
@@ -38,8 +38,11 @@ function plantslib:is_node_loaded(node_pos)
 	return true
 end
 
-function dbg(msg)
-	if DEBUG then minetest.log("verbose", msg) end
+function plantslib:dbg(msg)
+	if DEBUG then
+		print("[Plantlife] "..msg)
+		minetest.log("verbose", "[Plantlife] "..msg)
+	end
 end
 
 -- Spawn plants using the map generator
@@ -61,7 +64,7 @@ function plantslib:search_for_surfaces(minp, maxp, biome, funct_or_model)
 		if biome.temp_max == nil then biome.temp_max = -1 end
 		if biome.rarity == nil then biome.rarity = 50 end
 
-		dbg("Started checking generated mapblock volume...")
+		plantslib:dbg("Started checking generated mapblock volume...")
 		local searchnodes = minetest.env:find_nodes_in_area(minp, maxp, biome.surface)
 		local in_biome_nodes = {}
 		local num_in_biome_nodes = 0
@@ -88,18 +91,18 @@ function plantslib:search_for_surfaces(minp, maxp, biome, funct_or_model)
 			end
 		end
 		
-		dbg("Found "..num_in_biome_nodes.." surface nodes of type "..biome.surface.." in 5x5x5 mapblock volume at {"..dump(minp)..":"..dump(maxp).."} to check.")
+		plantslib:dbg("Found "..num_in_biome_nodes.." surface nodes of type "..biome.surface.." in 5x5x5 mapblock volume at {"..dump(minp)..":"..dump(maxp).."} to check.")
 
 		for i in ipairs(in_biome_nodes) do
 			local pos = in_biome_nodes[i]
 			local p_top = { x = pos.x, y = pos.y + 1, z = pos.z }
 			if minetest.env:find_node_near(p_top, biome.avoid_radius + math.random(-1.5,1.5), biome.avoid_nodes) == nil then
 				if type(funct_or_model) == "table" then
-					dbg("Spawn tree at {"..dump(pos).."}")
+					plantslib:dbg("Spawn tree at {"..dump(pos).."}")
 					minetest.env:spawn_tree(pos, funct_or_model)
 				else
-					dbg("Call function: "..funct_or_model.."("..dump(pos)..")")
-					dbg("Call function: "..funct_or_model.."("..dump(pos)..")")
+					plantslib:dbg("Call function: "..funct_or_model.."("..dump(pos)..")")
+					plantslib:dbg("Call function: "..funct_or_model.."("..dump(pos)..")")
 					assert(loadstring(funct_or_model.."("..dump(pos)..")"))()
 				end
 			end
@@ -177,14 +180,14 @@ function plantslib:spawn_on_surfaces(
 					then
 						local walldir = plantslib:plant_valid_wall(p_top)
 						if splant == "poisonivy:seedling" and walldir ~= nil then
-							dbg("Spawn: poisonivy:climbing at "..dump(p_top).." on "..ssurface)
+							plantslib:dbg("Spawn: poisonivy:climbing at "..dump(p_top).." on "..ssurface)
 							minetest.env:add_node(p_top, { name = "poisonivy:climbing", param2 = walldir })
 						else
 							local deepnode = minetest.env:get_node({ x = pos.x, y = pos.y-depthmax-1, z = pos.z }).name
 							if (ssurface ~= "default:water_source")
 								or (ssurface == "default:water_source"
 								and deepnode ~= "default:water_source") then
-								dbg("Spawn: "..splant.." at "..dump(p_top).." on "..ssurface)
+								plantslib:dbg("Spawn: "..splant.." at "..dump(p_top).." on "..ssurface)
 								minetest.env:add_node(p_top, { name = splant, param2 = facedir })
 							end
 						end
@@ -214,6 +217,7 @@ function plantslib:grow_plants(
 	if grow_vertically ~= true then grow_vertically = false end
 	if height_limit == nil then height_limit = 62000 end
 	if ground_nodes == nil then ground_nodes = { "default:dirt_with_grass" } end
+	if grow_nodes == nil then grow_nodes = { "default:dirt_with_grass" } end
 	minetest.register_abm({
 		nodenames = { gplant },
 		interval = gdelay,
@@ -231,26 +235,26 @@ function plantslib:grow_plants(
 							if need_wall then
 								local walldir=plantslib:plant_valid_wall(p_top)
 								if walldir ~= nil then
-									dbg("Grow: "..gplant.." upwards to ("..dump(p_top)..") on wall "..walldir)
+									plantslib:dbg("Grow: "..gplant.." upwards to ("..dump(p_top)..") on wall "..walldir)
 									minetest.env:add_node(p_top, { name = gplant, param2 = walldir })
 								end
 							else
-								dbg("Grow: "..gplant.." upwards to ("..dump(p_top)..")")
+								plantslib:dbg("Grow: "..gplant.." upwards to ("..dump(p_top)..")")
 								minetest.env:add_node(p_top, { name = gplant })
 							end
 						end
 
 					-- corner case for changing short junglegrass to dry shrub in desert
 					elseif n_bot.name == dry_early_node and gplant == "junglegrass:short" then
-						dbg("Die: "..gplant.." becomes default:dry_shrub at ("..dump(pos)..")")
+						plantslib:dbg("Die: "..gplant.." becomes default:dry_shrub at ("..dump(pos)..")")
 						minetest.env:add_node(pos, { name = "default:dry_shrub" })
 
 					elseif gresult == nil then
-						dbg("Die: "..gplant.." at ("..dump(pos)..")")
+						plantslib:dbg("Die: "..gplant.." at ("..dump(pos)..")")
 						minetest.env:remove_node(pos)
 
 					elseif gresult ~= nil then
-						dbg("Grow: "..gplant.." becomes "..gresult.." at ("..dump(pos)..")")
+						plantslib:dbg("Grow: "..gplant.." becomes "..gresult.." at ("..dump(pos)..")")
 						if facedir == nil then
 							minetest.env:add_node(pos, { name = gresult })
 						else
@@ -264,11 +268,11 @@ function plantslib:grow_plants(
 					local noise1 = perlin1:get2d({x=p_top.x, y=p_top.z})
 					local noise2 = perlin2:get2d({x=p_top.x, y=p_top.z})
 					if type(grow_function) == "table" then
-						dbg("Grow sapling into tree at "..dump(pos))
+						plantslib:dbg("Grow sapling into tree at "..dump(pos))
 						minetest.env:remove_node(pos)
 						minetest.env:spawn_tree(pos, grow_function)
 					else
-						dbg("Call function: "..grow_function.."("..dump(pos)..","..noise1..","..noise2..")")
+						plantslib:dbg("Call function: "..grow_function.."("..dump(pos)..","..noise1..","..noise2..")")
 						assert(loadstring(grow_function.."("..dump(pos)..","..noise1..","..noise2..")"))()
 					end
 				end