many worldgen mods and gonna try technic now

mods/dfcaverns/df_primordial_items/sapling_growth_conditions.lua

@@ -0,0 +1,22 @@
+-- these methods should indicate whether a sapling placed at pos should bother attempting to grow.
+-- check soil conditions and biome here, for example.
+
+df_primordial_items.giant_fern_growth_permitted = function(pos)
+	return minetest.get_item_group(minetest.get_node({x=pos.x, y=pos.y-1, z=pos.z}).name, "soil") > 0
+end
+
+df_primordial_items.giant_mycelium_growth_permitted = function(pos)
+	return true
+end
+
+df_primordial_items.jungle_mushroom_growth_permitted = function(pos)
+	return minetest.get_item_group(minetest.get_node({x=pos.x, y=pos.y-1, z=pos.z}).name, "soil") > 0
+end
+
+df_primordial_items.jungletree_growth_permitted = function(pos)
+	return minetest.get_item_group(minetest.get_node({x=pos.x, y=pos.y-1, z=pos.z}).name, "soil") > 0
+end
+
+df_primordial_items.primordial_mushroom_growth_permitted = function(pos)
+	return minetest.get_item_group(minetest.get_node({x=pos.x, y=pos.y-1, z=pos.z}).name, "soil") > 0
+end