My bog standard yellow wallflowers have grown into small woody shrubs in
2 years, and the experts say they belong on the compost heap. Currently
they are covered in seed pods, and the lower parts are sprouting new
shoots everywhere.
My plan is to harvest the seeds for scattering next Spring, cut the
plants back to 6" or so, and maybe stick the offcuts in pots. They seem
very vigorous at the moment, and hopefully might overwinter in a cold
frame. I rather like the scruffy look of them and they were spectacular
in the Spring, so I'm reluctant to do what Monty suggests!
Thanks for any comments