Last year I planted a malve Blue fountian that flowered all season. Unfortunetly I lost it over the winter. This year I tried two varities, both Malve sylvestris, Mystic Merlin and nZebrina. These stopped bloming the end of July and I would like to know if I should cut the plante back. None of my guides has any information on Malve sylvestris, not even Tracy DiSabato- Aust,Well Tended Prrennial Garden. Any advise would be appriciated.