Use & Care NotesCompanion Plants
Prairie Princess Ironweed: Late Rosy Purple After the Lavender Harvest
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Prairie Princess ironweed is a compact take on a tough prairie native. From late summer into early fall, its upper half disappears under flat to domed clusters of small, fluffy, rosy purple flower heads. The rest of the season, narrow dark olive-green leaves with a silvery sheen keep it looking sharp.
Compared with wild ironweed, it is shorter and sturdier, with stems that stay upright in heavy rain and better mildew resistance. For a lavender grower, its best trick is timing: purple in the garden again, weeks after the lavender has been cut.
Prairie Princess at a glance
| Trait | What to expect |
|---|---|
| Botanical name | Vernonia 'Prairie Princess' |
| Flowers | Rosy purple, fluffy clusters 3 to 5 inches wide |
| Foliage | Narrow, dark olive green with a silver cast |
| Size | 26 to 30 inches tall, 30 to 36 inches wide |
| Bloom | Starts mid-August, peaks early September, about six weeks |
| Hardiness | USDA zones 4 to 9 |
| Light | Full sun |
| Wildlife | Excellent for pollinators and butterflies; deer resistant |
A late-season backdrop
Set Prairie Princess behind a row of lavender and it plays two roles. Through early summer, its silvery olive leaves form a dark, rounded backdrop that makes lavender's gray-green and purple stand out. Then, in mid-August, it erupts in rosy purple fluff right when the lavender bed is at its quietest. Butterflies love those late flowers, and so do bees stocking up before fall.
It is wider than it is tall, close to three feet across, so give it room and keep it from crowding the lavender in front. Use the Companion Plant Planner to space the two.
Native toughness
- Soil: average soil, dry or moist. That flexibility also lets it bridge from a lavender bed into a rain garden.
- Heat: very heat tolerant; it keeps blooming through hot late-summer weather.
- Disease: generally trouble-free. Good airflow keeps foliage clean in humid summers.
- Self-sowing: deadhead after bloom if you do not want seedlings.
- Winter: fully hardy in Michigan within its zones. Leave stems standing and cut back in early spring.
Cutting and drying
The flower clusters are good for cutting and dry fairly well. Rosy purple ironweed with dried lavender and a few grass seed heads makes a fine prairie-style fall bundle.
Plug tray or bare root
Prairie Princess comes as a 72-cell plug tray for meadow and pollinator plantings, and as a bare root plant for direct planting. See each product page for current availability.
Frequently asked questions
Will Prairie Princess flop like wild ironweed?
It was selected to stay shorter and sturdier, with stems that stay upright even after heavy rain.
Is it a native plant?
Ironweed is a North American prairie plant, and this compact selection suits native and pollinator gardens.
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