try a more efficient way of changing the interiors of columns

df_caverns/mod.conf

@@ -1,4 +1,4 @@
 name = df_caverns
 description = Adds vast underground caverns in the style of Dwarf Fortress, complete with underground flora in diverse biomes. Also adds stalactite/stalagmite decorations in the smaller tunnels.
 depends = default, subterrane, df_trees, df_mapitems
-optional_depends = df_farming, ice_sprites, oil, df_underworld_items, magma_conduits, bones_loot
+optional_depends = df_farming, ice_sprites, oil, df_underworld_items, magma_conduits, bones_loot, named_waypoints, map

df_caverns/primordial.lua

@@ -299,6 +299,7 @@ local decorate_primordial = function(minp, maxp, seed, vm, node_arrays, area, da
 		local jungle = nvals_cave[vi] < 0
 		if jungle then
 			data[vi] = c_plant_matter
+			minetest.get_node_timer(area:position(vi)):start(math.random(10, 60))
 		else
 			data[vi] = c_mycelial_dirt
 		end

df_caverns/sunless_sea.lua

@@ -380,6 +380,7 @@ local decorate_sunless_sea = function(minp, maxp, seed, vm, node_arrays, area, d
 			else
 				data[vi] = c_coral_table[math.random(1,3)]
 				data_param2[vi] = math.random(1,4)-1
+				minetest.get_node_timer(area:position(vi)):start(math.random(10, 60))
 			end
 		end
 	end