Posted: 14/09/2013 at 17:36
If you saw gardeners world this week Monty was talking about deadheading dahlias. ,anyway, the more you deadhead the more flowers you should,have. ,always cut back those long stalks to shoots further down.
Let the frost dictate when flowering is over. ,when foliage is blackened by the frost you can lift or keep,dahlias in the ground of its mild enough where you live.
Well, dahlias flower for a long time....mid to late summer. Are you looking for plants that flower for late,spring? There are lots of perennials but lupins are excellent for late spring to mid summer. Delphiniums too.