I made the mistake of planting two 25 cent seed packets of cosmos in my garden and promptly forgot about them. I neglected to stake them and they grew horizontally, about 4-5' long. When I cut them back after flowering, I had to use an AXE, some stems were 8 inches in diameter. I did not dig them up because they were labeled annuals. Please tell me these things aren't going to come back next year.