Experts and BHG readers answer.
FLOWER ON HOT HOT POKER PLANT
Thanks for writing. It could be that your plants are still working on getting adjusted to your landscape, especially if you planted them late last year. Sometimes perennials like this require we gardeners to be patient, as hard as that can be sometimes...!
Other than that, be sure they're in a spot with full sun (at least 6 hours of direct sunlight hitting the plants per day) and are in well-drained soil.
---Justin, Senior Garden Editor, BHG.com