Product Field NotesCompanion Plants
Dark Amethyst Penstemon: Hummingbird Spikes in Lavender Soil
Save
Dark Amethyst penstemon is a bearded penstemon, or beardtongue, with slender, upright stems lined in narrow tubular flowers of dark reddish purple. The color is deeper than most purple penstemons and has no blue cast, so it reads as rich wine rather than violet. Underneath, a dense clump of smooth, dark blue-green leaves looks good all season.
Dark Amethyst at a glance
| Trait | What to expect |
|---|---|
| Botanical name | Penstemon barbatus 'Dark Amethyst' |
| Flowers | Dark reddish purple, tubular, about an inch long |
| Foliage | Dark blue-green, lance-shaped |
| Size | 18 to 22 inches tall, 20 to 26 inches wide |
| Bloom | Starts early June, peaks mid-June, about four weeks |
| Hardiness | USDA zones 4 to 8 |
| Light | Full sun |
| Wildlife | Great for pollinators, especially hummingbirds; moderately deer resistant |
A natural partner for lavender
This penstemon comes from a species native to rocky hillsides of the Southwest, so it shares lavender's love of sun and sharp drainage and dislikes the same thing: wet, heavy soil in winter. That makes it one of the few perennials you can plant right in the lavender bed without changing how you water.
Its timing and color are just as useful. It opens in early June and blooms for about four weeks, bridging into the first lavender flowers. The wine-purple spikes deepen the color of a lavender planting and add a second flower shape: hummingbird-friendly tubes beside lavender's bee-friendly whorls. Together they make a full pollinator stop. Try groupings in the Companion Plant Planner.
Planting and care
- Soil: well drained, even gritty. Sandy or gravelly soil is ideal; improve heavy clay or use a raised bed.
- Water: regular water the first season, then it handles heat and dry spells well.
- After bloom: cut spent spikes down to the foliage to tidy the plant and coax a smaller late-summer rebloom.
- Winter: hardy in Michigan in well-drained soil. Leave the basal leaves in place and keep heavy mulch off the crown.
- Pests: few problems beyond occasional aphids or spider mites in hot, dry weather.
Where else it shines
Beyond the lavender bed, Dark Amethyst suits rock gardens, xeriscapes, hummingbird gardens and containers. It is fair as a cut flower; a few stems mixed with fresh lavender make a deep-toned small bouquet. It is offered as a full 72-cell plug tray, a practical size for pollinator plantings. See the product page for current availability.
Frequently asked questions
Why is it called beardtongue?
Penstemon flowers have a small, often hairy sterile stamen in the throat, which looks a bit like a tiny bearded tongue.
Does it need deadheading?
It is not required, but cutting spent spikes back keeps the clump tidy and encourages a light rebloom.
Will it rot in clay?
It can. Wet, heavy soil, especially in winter, is the main cause of loss. Raise the bed or amend generously, just as you would for lavender.
Share how it went in your field