I have a few dahlias and gladioli I planted this spring. They flowered, but now the last of the gladioli has lost its flowers and whilst the dahlia is still producing flowers, you can tell it's starting to wind down, with fewer new heads forming to replace the old ones.
The green stems of the gladioli are still very green and healthy, so should I leave them along or could I cut them down to the base now?
And once the last of the dahlia flowers is gone (when is that likely to be? I didn't expect them to still be flowering in October) should I cut the bush back down to the base?
Also, is it OK to plant dahlias and gladioli bulbs together with daffodil and tulip bulbs? My hope is I can densely pack both bulbs in the same areas so that the gladiolis and dahlias flower in the summer whils the daffs and tulips flower in the spring, without the need to dig up one set of bulbs and re-plant the other twice a year.