Like many gardeners, I have a fondness for blue flowers. ‘Great blue’ perennial lobelia not only gives me a taste of sky blue, but also does so late in the season when other blues have faded. The charming and exquisite flowers cluster at the top of a sturdy stem; their tubular form splays open to offer abundant nectar to appreciative hummingbirds and butterflies. This woodland native is the blue version of cardinal flower, preferring a moist, sunny location, but mine do fine in part sun and ‘regular’ soil. They do self-seed gently, though I’ve heard can be more aggressive in ideal moist conditions. And, multi-purposed as many perennials are, their seed heads provide winter snacks for the birds.
Technical stuff – Great blue perennial lobelia/siphilitica, hardy to zone 4, prefers full sun but mine does fine in part sun, likes moist rich soil, height 24”-36” and spread of about 18”, blooming late summer into fall.