Fixes vines not being vines.

code/modules/hydroponics/trays/tray_process.dm

@@ -120,6 +120,14 @@
 		harvest = 1
 		lastproduce = age
 
+	// If we're a vine which is not in a closed tray and is at least half mature, and there's no vine currently on our turf: make one (maybe)
+	if(!closed_system && \
+	 seed.get_trait(TRAIT_SPREAD) == 2 && \
+	 2 * age >= seed.get_trait(TRAIT_MATURATION) && \
+	 !(locate(/obj/effect/plant) in get_turf(src)) && \
+	 prob(2 * seed.get_trait(TRAIT_POTENCY)))
+		new /obj/effect/plant(get_turf(src), seed)
+
 	if(prob(3))  // On each tick, there's a chance the pest population will increase
 		pestlevel += 0.1 * HYDRO_SPEED_MULTIPLIER