diff --git a/code/modules/cargo/exports/seeds.dm b/code/modules/cargo/exports/seeds.dm
index 3aa33ea2cf6..b560c7bbee5 100644
--- a/code/modules/cargo/exports/seeds.dm
+++ b/code/modules/cargo/exports/seeds.dm
@@ -3,17 +3,26 @@
 	k_elasticity = 0 //price inelastic/quantity elastic, only need to export a few samples
 	unit_name = "new plant species sample"
 	export_types = list(/obj/item/seeds)
-	// Only for undiscovered species
+	/// Only for undiscovered species
 	var/needs_discovery = FALSE
-	// Plants sold on the market
+	/// Plants sold on the market
 	var/static/list/discovered_plants = list()
+	/// Highest rarity of the most valuable seed
+	var/highest_rarity = 0
+
+/datum/export/seed/New()
+	. = ..()
+	for(var/obj/item/seeds/seed as anything in subtypesof(/obj/item/seeds))
+		if(seed::rarity > highest_rarity)
+			highest_rarity = seed::rarity
 
 /datum/export/seed/get_base_cost(obj/item/seeds/S)
-	if(!needs_discovery && (S.type in discovered_plants))
+	var/discovered = discovered_plants[S.type]
+	if(!needs_discovery && discovered)
 		return 0
-	if(needs_discovery && !(S.type in discovered_plants))
+	if(needs_discovery && !discovered)
 		return 0
-	return ..() * S.rarity // That's right, no bonus for potency. Send a crappy sample first to "show improvement" later.
+	return ..() * (S.rarity /  highest_rarity) // That's right, no bonus for potency. Send a crappy sample first to "show improvement" later.
 
 /datum/export/seed/sell_object(obj/item/seeds/S, datum/export_report/report, dry_run, apply_elastic)
 	. = ..()
@@ -23,7 +32,6 @@
 /datum/export/seed/potency
 	cost = CARGO_CRATE_VALUE * 0.0125 // Gets multiplied by potency and rarity.
 	unit_name = "improved plant sample"
-	export_types = list(/obj/item/seeds)
 	needs_discovery = TRUE // Only for already discovered species
 
 /datum/export/seed/potency/get_base_cost(obj/item/seeds/S)