diff --git a/code/modules/hydroponics/grown/towercap.dm b/code/modules/hydroponics/grown/towercap.dm
index 1d1d0edad032..887496ddd438 100644
--- a/code/modules/hydroponics/grown/towercap.dm
+++ b/code/modules/hydroponics/grown/towercap.dm
@@ -16,6 +16,7 @@
 	icon_dead = "towercap-dead"
 	genes = list(/datum/plant_gene/trait/plant_type/fungal_metabolism)
 	mutatelist = list(/obj/item/seeds/tower/steel)
+	reagents_add = list(/datum/reagent/carbon = 0.5)
 
 /obj/item/seeds/tower/steel
 	name = "pack of steel-cap mycelium"
@@ -25,6 +26,7 @@
 	plantname = "Steel Caps"
 	product = /obj/item/grown/log/steel
 	mutatelist = list()
+	reagents_add = list(/datum/reagent/iron = 0.5)
 	rarity = 20