diff --git a/mods/plantlife_modpack/plants_lib/init.lua b/mods/plantlife_modpack/plants_lib/init.lua
index 00e4831c..7b626154 100755
--- a/mods/plantlife_modpack/plants_lib/init.lua
+++ b/mods/plantlife_modpack/plants_lib/init.lua
@@ -204,7 +204,7 @@ function plantslib:populate_surfaces(biome, nodes_or_function_or_model, snodes,
 		local pos = snodes[i]
 		local p_top = { x = pos.x, y = pos.y + 1, z = pos.z }
 		local noise1 = perlin_fertile_area:get2d({x=pos.x, y=pos.z})
-		local noise2 = plantslib.perlin_temperature:get2d({x=pos.x, y=pos.z})
+		local noise2 = -plantslib.perlin_temperature:get2d({x=pos.x, y=pos.z})
 		local noise3 = plantslib.perlin_humidity:get2d({x=pos.x+150, y=pos.z+50})
 		local biome_surfaces_string = dump(biome.surface)
 		local surface_ok = false