How to Prune marsh mallow?
Cut down to ground once flowering is over

marsh mallow · Althaea officinalis
Also known as: bismalva; guimauve; Joseph's staff; mauve; mortification root; white mallow; wymot; wymote
Easy to grow and tolerates a wide range of conditions, though does best in fertile, moist but well-drained soil in full sun
Cut down to ground once flowering is over