Mistflower conoclinium greggii — a quick note to anchor this piece for readers.
Mistflower conoclinium greggii: Quick notes
Want to know how to grow Gregg’s mistflower in Arizona? Keep reading for exactly how to plant it, how much sun and water it needs, when to prune, how it handles frost, and the best planting windows.
Gregg’s mistflower was the star of my fall garden. From October through November, it was covered in Queen butterflies, and for a brief stretch in November, the Monarchs showed up too. I was in awe. It was also the star of the show all fall at Arizona Worm Farm. Every time I visited, the plants were blanketed in Queens and bringing joy to everyone who walked by. I picked up my transplant there last spring. I planted mine in a raised bed, but it does just as well in the ground. It survived the summer here, and I just added more to my front yard pollinator and milkweed garden in a rain-catchment area.
Plant tag and Texas Ageratum with a Queen butterfly at Arizona Worm Farm
Want a complete habitat plan? See my Arizona Butterfly Garden Guide for host, nectar, shelter, and water.
Key Takeaways
- Gregg’s mistflower attracts butterflies like Queens and Monarchs, thriving in gardens during fall.
- It prefers morning sun, well-drained soil, and moderate watering for optimal growth.
- Plant transplants in fall or early spring, allowing roots to establish before summer heat.
- Mistflower can handle light frosts but may go dormant; a late winter cutback promotes new growth.
- This plant is perfect for pollinator gardens, pairing well with native milkweeds and long-blooming nectar plants.
Queen butterfly
Quick facts
- Botanical name: Conoclinium greggii
- Type: Perennial nectar plant
- Size: 12–30 in tall (30–75 cm), spreading clumps
- Bloom: Late summer through fall in the low desert
- Pollinators: Queens, Monarchs, skippers, native bees
- Habit: Spreads by short rhizomes; easy to shape
Also called “Texas ageratum”
Gregg’s mistflower (Conoclinium greggii) is also known as Texas ageratum or blue mistflower. It’s different from the annual flossflower/ageratum (Ageratum houstonianum). They share a family but are different genera—Gregg’s mistflower is a perennial that spreads by short rhizomes and shines in late summer and fall.
Growing conditions (low desert)
- Sun: Morning sun with light afternoon shade is ideal. In very hot spots, filtered light helps it bloom longer.
- Soil: Well-drained, loamy or amended native soil. It will grow in raised beds or in the ground.
- Water: Moderate. Keep evenly moist getting established, then water deeply and regularly to keep it blooming through heat.
- Spacing: 18–24 in (45–60 cm) apart to allow spreading.
- Fertilizer: Not heavy-feeding. Amending with a little compost or worm castings in spring is enough.
When to plant
- Best timing: Plant transplants in fall or early spring so roots establish before summer heat.
- Containers or beds: Works in large containers, raised beds, or in-ground borders.
How to plant
- Choose a spot with morning sun and good drainage.
- Loosen soil 8–12 in (20–30 cm) deep. Mix in compost if needed.
- Set the crown level with the soil surface and water deeply.
- Mulch 1–2 in (2.5–5 cm) around the plant to moderate heat and conserve moisture, keeping mulch off the stems.
Watering
- Keep soil consistently moist for the first 4–6 weeks.
- Once established, water deeply, then allow the top inch (2–3 cm) to dry before watering again.
- In a rain-catchment or basin, it benefits from monsoon runoff. That’s where I added mine in the front yard.
Summer care
Mistflower can handle our summers if it has a little afternoon shade and steady moisture. A layer of mulch helps. If it struggles a bit, it should rebound quickly once the nights cool.
Frost tolerance and winter care
Light frosts may nip the tops. After frost, it will brown and can go dormant. In late winter, shear or cut back to a few inches to clean it up. New growth returns with warmer days.
How to prune
- Deadhead lightly when it’s blooming to shape and encourage new blooms.
- Hard cutback in late winter to refresh the clump.
- If it spreads more than you want, edge or spade off the outer runners and replant divisions elsewhere.
Propagation
- Division: Lift and split clumps in early spring.
- Cuttings: Softwood cuttings root easily in warm weather.
Pests and notes
- Generally low pest pressure.
- Aphids are normal on nearby milkweed and are mostly cosmetic. They do not bother Monarch or Queen caterpillars. Do not spray. Caterpillar eggs are tiny and easy to dislodge, and efforts to make milkweed aphid-free can cause harm.
Design ideas and good companions
- Plant mistflower between native milkweeds so adults have nectar near larval hosts.
- Pair with long-bloom nectar plants for continuous color:
- Tithonia (Mexican sunflower) for late-summer fuel
- Zinnias for all-summer landing pads
- Verbena and blackfoot daisy for low edging
- Dalea or Buddleja marrubifolia for a drought-tough shrub backdrop
- Add a puddling dish nearby for minerals and a shelter shrub upwind to calm the air.
My experience
Monarch butterfly
The plant I brought home from Arizona Worm Farm took off in a raised bed, bloomed through fall, and was covered in Queens for weeks. It survived summer with afternoon shade and regular deep watering. I liked it so much, I added another plant to my front yard pollinator garden.
Keep learning and planting
FAQs
Is Gregg’s mistflower invasive in Arizona?
In the low desert it spreads politely by short rhizomes. Give it space or edge it once a year if needed.
Will it bloom in full sun?
Yes, but it holds blooms longer with morning sun and light afternoon shade in our heat.
When will butterflies use it?
Peak activity is late summer through fall. Queens are especially drawn to it in October and November here.
Can I grow it in a container?
Yes. Choose a wide pot with a well-drained mix. Water consistently and shear in late winter.
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