Uses more QDEL_NULLs

code/modules/hydroponics/gene_modder.dm

@@ -296,8 +296,7 @@
 							var/datum/plant_gene/core/gene = disk.gene
 							gene.value = min(gene.value, max_extract_pot)
 						disk.update_name()
-						qdel(seed)
-						seed = null
+						QDEL_NULL(seed)
 						update_icon()
 				if("replace")
 					if(disk && disk.gene && istype(disk.gene, G.type) && istype(G, /datum/plant_gene/core))
@@ -421,4 +420,4 @@
 /obj/item/weapon/storage/box/disks_plantgene/New()
 	..()
 	for(var/i in 1 to 7)
-		new /obj/item/weapon/disk/plantgene(src)
+		new /obj/item/weapon/disk/plantgene(src)

code/modules/hydroponics/hydroponics.dm

@@ -373,8 +373,7 @@
 	var/oldPlantName
 	if(myseed) // In case there's nothing in the tray beforehand
 		oldPlantName = myseed.plantname
-		qdel(myseed)
-		myseed = null
+		QDEL_NULL(myseed)
 	else
 		oldPlantName = "empty tray"
 	switch(rand(1,18))		// randomly pick predominative weed
@@ -422,8 +421,7 @@
 	var/oldPlantName = myseed.plantname
 	if(myseed.mutatelist.len > 0)
 		var/mutantseed = pick(myseed.mutatelist)
-		qdel(myseed)
-		myseed = null
+		QDEL_NULL(myseed)
 		myseed = new mutantseed
 	else
 		return
@@ -445,8 +443,7 @@
 /obj/machinery/hydroponics/proc/mutateweed() // If the weeds gets the mutagent instead. Mind you, this pretty much destroys the old plant
 	if( weedlevel > 5 )
 		if(myseed)
-			qdel(myseed)
-			myseed = null
+			QDEL_NULL(myseed)
 		var/newWeed = pick(/obj/item/seeds/liberty, /obj/item/seeds/angel, /obj/item/seeds/nettle/death, /obj/item/seeds/kudzu)
 		myseed = new newWeed
 		dead = 0
@@ -914,8 +911,7 @@
 			plant_health = 0
 			if(harvest)
 				harvest = FALSE //To make sure they can't just put in another seed and insta-harvest it
-			qdel(myseed)
-			myseed = null
+			QDEL_NULL(myseed)
 			plant_hud_set_health()
 			plant_hud_set_status()
 		adjustWeeds(-10) //Has a side effect of cleaning up those nasty weeds
@@ -935,8 +931,7 @@
 	else if(dead)
 		dead = 0
 		to_chat(user, "<span class='notice'>You remove the dead plant from [src].</span>")
-		qdel(myseed)
-		myseed = null
+		QDEL_NULL(myseed)
 		update_icon()
 		plant_hud_set_status()
 		plant_hud_set_health()
@@ -953,8 +948,7 @@
 	else
 		to_chat(user, "<span class='notice'>You harvest [myseed.getYield()] items from the [myseed.plantname].</span>")
 	if(!myseed.get_gene(/datum/plant_gene/trait/repeated_harvest))
-		qdel(myseed)
-		myseed = null
+		QDEL_NULL(myseed)
 		dead = 0
 	plant_hud_set_status()
 	plant_hud_set_health()
@@ -1041,4 +1035,4 @@
 	else
 		..()
 
-#undef HYDRO_CYCLES_PER_AGE
+#undef HYDRO_CYCLES_PER_AGE