diff --git a/mods/default/trees.lua b/mods/default/trees.lua
index 8e99eb72..03c3f198 100644
--- a/mods/default/trees.lua
+++ b/mods/default/trees.lua
@@ -57,7 +57,6 @@ function default.grow_tree(pos, is_apple_tree, bad)
 	if bad then
 		error("Deprecated use of default.grow_tree")
 	end
-	local seed = math.random(1, 100000)
 
 	local vm = minetest.get_voxel_manip()
 	local minp, maxp = vm:read_from_map(
@@ -67,8 +66,8 @@ function default.grow_tree(pos, is_apple_tree, bad)
 	local a = VoxelArea:new({MinEdge = minp, MaxEdge = maxp})
 	local data = vm:get_data()
 
-	local pr = PseudoRandom(seed)
-	local th = pr:next(4, 5)
+	local random = math.random
+	local th = random(4, 5)
 	local x, y, z = pos.x, pos.y, pos.z
 	for yy = y, y + th - 1 do
 		local vi = a:index(x, yy, z)
@@ -96,9 +95,9 @@ function default.grow_tree(pos, is_apple_tree, bad)
 	-- Add leaves randomly
 	for iii = 1, 8 do
 		local d = 1
-		local xx = pr:next(leaves_a.MinEdge.x, leaves_a.MaxEdge.x - d)
-		local yy = pr:next(leaves_a.MinEdge.y, leaves_a.MaxEdge.y - d)
-		local zz = pr:next(leaves_a.MinEdge.z, leaves_a.MaxEdge.z - d)
+		local xx = random(leaves_a.MinEdge.x, leaves_a.MaxEdge.x - d)
+		local yy = random(leaves_a.MinEdge.y, leaves_a.MaxEdge.y - d)
+		local zz = random(leaves_a.MinEdge.z, leaves_a.MaxEdge.z - d)
 
 		for xi = 0, d do
 		for yi = 0, d do
@@ -115,7 +114,7 @@ function default.grow_tree(pos, is_apple_tree, bad)
 	for zi = -2, 2 do
 		local vi = a:index(x + xi, y + yi, z + zi)
 		if data[vi] == c_air and leaves_buffer[leaves_a:index(xi, yi, zi)] then
-			if is_apple_tree and pr:next(1, 100) <=  10 then
+			if is_apple_tree and random(1, 100) <= 10 then
 				data[vi] = c_apple
 			else
 				data[vi] = c_leaves
@@ -141,7 +140,7 @@ function default.grow_jungletree(pos, bad)
 	if bad then
 		error("Deprecated use of default.grow_jungletree")
 	end
-	local seed = math.random(1, 100000)
+
 	local vm = minetest.get_voxel_manip()
 	local minp, maxp = vm:read_from_map(
 			{x = pos.x - 2, y = pos.y - 1, z = pos.z - 2},
@@ -149,13 +148,13 @@ function default.grow_jungletree(pos, bad)
 	local a = VoxelArea:new({MinEdge = minp, MaxEdge = maxp})
 	local data = vm:get_data()
 
-	local pr = PseudoRandom(seed)
+	local random = math.random
 	local x, y, z = pos.x, pos.y, pos.z
 
 	-- Add the roots
 	for xi = -1, 1 do
 	for zi = -1, 1 do
-		if pr:next(1, 3) >= 2 then
+		if random(1, 3) >= 2 then
 			local vi1 = a:index(x + xi, y,     z + zi)
 			local vi2 = a:index(x + xi, y - 1, z + zi)
 			if data[vi2] == c_air then
@@ -168,7 +167,7 @@ function default.grow_jungletree(pos, bad)
 	end
 
 	-- Add the trunk
-	local th = pr:next(8, 12)
+	local th = random(8, 12)
 	for yy = y, y + th - 1 do
 		local vi = a:index(x, yy, z)
 		if data[vi] == c_air or yy == y then
@@ -195,9 +194,9 @@ function default.grow_jungletree(pos, bad)
 	-- Add leaves randomly
 	for iii = 1, 30 do
 		local d = 1
-		local xx = pr:next(leaves_a.MinEdge.x, leaves_a.MaxEdge.x - d)
-		local yy = pr:next(leaves_a.MinEdge.y, leaves_a.MaxEdge.y - d)
-		local zz = pr:next(leaves_a.MinEdge.z, leaves_a.MaxEdge.z - d)
+		local xx = random(leaves_a.MinEdge.x, leaves_a.MaxEdge.x - d)
+		local yy = random(leaves_a.MinEdge.y, leaves_a.MaxEdge.y - d)
+		local zz = random(leaves_a.MinEdge.z, leaves_a.MaxEdge.z - d)
 
 		for xi = 0, d do
 		for yi = 0, d do