I have a few asparagus plants outdoors (actual asparagus, not the fern) and since I didn't manage to harvest any of them this year, they're super tall and fluffy. The odd thing is that some of them are yellowing now, when normally it doesn't happen til fall. They also have a sticky white substance in clumps on the stems. I cut them back since it doesn't look great but should I treat them with anything? All my searching only yielded answers on treating houseplants.