diff --git a/code/modules/hydroponics/hydroponics.dm b/code/modules/hydroponics/hydroponics.dm
index e6c37ea39f4..1f63b52ed03 100644
--- a/code/modules/hydroponics/hydroponics.dm
+++ b/code/modules/hydroponics/hydroponics.dm
@@ -615,11 +615,11 @@
 
 	// Saltpetre is used for gardening IRL, to simplify highly, it speeds up growth and strengthens plants
 	if(S.has_reagent("saltpetre", 1))
-		adjustHealth(round(S.get_reagent_amount("saltpetre") * 0.25))
-		if(myseed)
-			myseed.adjust_production(-round(S.get_reagent_amount("saltpetre") * 0.01))
-			myseed.adjust_potency(round(S.get_reagent_amount("saltpetre") * 0.05))
-
+		var/salt = S.get_reagent_amount("saltpetre")
+		adjustHealth(round(salt * 0.25))
+		if (myseed)
+			myseed.adjust_production(-round(salt/100)-prob(salt%100))
+			myseed.adjust_potency(round(salt*0.15))
 	// Ash is also used IRL in gardening, as a fertilizer enhancer and weed killer
 	if(S.has_reagent("ash", 1))
 		adjustHealth(round(S.get_reagent_amount("ash") * 0.25))