I bought an Asparagus plant in the spring last year 2012. It has been doing well untill just 2 months ago in May I noticed it starting to turn yellow then brown and now there is just one sm green place on it left. Please what can I do to say this plant ? I don't see any thing eating it. I have it in a 5 gal contaner to keep it up right and the contaner bottom is cut out. any help would be Appreciated ty.