diff --git a/df_farming/growth_conditions.lua b/df_farming/growth_conditions.lua
index e69de29..8ce1f42 100644
--- a/df_farming/growth_conditions.lua
+++ b/df_farming/growth_conditions.lua
@@ -0,0 +1,25 @@
+df_farming.growth_permitted = {}
+
+df_farming.growth_permitted["df_farming:cave_wheat_seed"] = function(pos)
+	return true
+end
+
+df_farming.growth_permitted["df_farming:dimple_cup_seed"] = function(pos)
+	return true
+end
+
+df_farming.growth_permitted["df_farming:pig_tail_seed"] = function(pos)
+	return true
+end
+
+df_farming.growth_permitted["df_farming:quarry_bush_seed"] = function(pos)
+	return true
+end
+
+df_farming.growth_permitted["df_farming:sweet_pod_seed"] = function(pos)
+	return true
+end
+
+df_farming.growth_permitted["df_farming:plump_helmet_spawn"] = function(pos)
+	return true
+end
\ No newline at end of file
diff --git a/df_farming/plants.lua b/df_farming/plants.lua
index 455de13..2714001 100644
--- a/df_farming/plants.lua
+++ b/df_farming/plants.lua
@@ -35,7 +35,6 @@ df_farming.spawn_dead_fungus_vm = function(vi, area, data, param2_data)
 	param2_data[vi] = 0
 end
 
--- not DF canon
 minetest.register_node("df_farming:cavern_fungi", {
 	description = S("Cavern Fungi"),
 	_doc_items_longdesc = df_farming.doc.cavern_fungi_desc,
@@ -132,7 +131,10 @@ local place_seed = function(itemstack, placer, pointed_thing, plantname)
 	
 	-- add the node and remove 1 item from the itemstack
 	minetest.add_node(pt.above, {name = plantname, param2 = 1})
-	df_farming.plant_timer(pt.above, plantname)
+	local growth_permitted_function = df_farming.growth_permitted[plantname]
+	if not growth_permitted_function or growth_permitted_function(pt.above) then
+		df_farming.plant_timer(pt.above, plantname)
+	end
 	if not minetest.settings:get_bool("creative_mode", false) then
 		itemstack:take_item()
 	end
diff --git a/df_farming/plump_helmet.lua b/df_farming/plump_helmet.lua
index 366e207..303751b 100644
--- a/df_farming/plump_helmet.lua
+++ b/df_farming/plump_helmet.lua
@@ -47,7 +47,12 @@ local plump_helmet_on_place =  function(itemstack, placer, pointed_thing, plantn
 
 	-- add the node and remove 1 item from the itemstack
 	minetest.add_node(pt.above, {name = plantname, param2 = math.random(0,3)})
-	df_farming.plant_timer(pt.above, plantname)
+	
+	local growth_permitted_function = df_farming.growth_permitted["df_farming:plump_helmet_spawn"] -- use the same permitted function for all plump helmets
+	if not growth_permitted_function or growth_permitted_function(pt.above) then
+		df_farming.plant_timer(pt.above, plantname)
+	end
+
 	if not minetest.settings:get_bool("creative_mode", false) then
 		itemstack:take_item()
 	end