Calylophus hartwegii High Plains Yellow

High Plains Yellow Sundrops




Exclusive. 'High Plains Yellow' Sundrops is a long blooming wildflower from the western Great Plains that withstands heat, drought and rugged growing conditions. Drought resistant/drought tolerant plant (xeric).

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Zones 5 - 9
Deer Resistant
Deer Resistant
Attract Butterflies
Attract Butterflies
Extended Bloom Time (more than 4 weeks)
Good Rockgarden or alpine plant
Great for Mass Plantings
Light Requirements
Full Sun
Full Sun
Annual Rainfall
10 to 20"
20 to 30"
Ideal Region
Only in Western US
Bloom Time Late spring to late summer
Shipping Buy now and we'll ship your order during the ideal planting time for your region. Orders with this item will begin shipping the week of Feb. 29 and continue through mid-June. Expected ship week will display at checkout after you enter your zip code. More shipping info. Learn More…


4-6" tall x 12-15" wide. A new, long blooming wildflower introduction collected from the rugged, high dry plains of eastern NM, ‘High Plains Yellow’ Sundrops is well adapted to heat, cold, wind, and drought. This prairie native thrives in harsh conditions. Beginning in late spring, colorful, red speckled buds burst open into large, brilliant yellow flowers. It’s a superb companion plant for Lavender.
Associated SKUs
HBLE321 (Plant - 2.5" deep pot)
HBLE351 (Plant - 5" deep pot) - Out of stock.
Common Name High Plains Yellow Sundrops
Botanical Name Calylophus hartwegii High Plains Yellow
Zones 5, 6, 7, 8, 9
Light Requirements Full Sun
Mature Height 4-6" tall
Mature Spread 12-15" wide
Bloom Time Late spring to late summer
Ships As Potted Plant
Native Yes
Planting Time Spring / Summer, Fall
Soil Type Clay Soil, Sandy Soil, Average Soil
Soil Moisture Drought Resistant / Waterwise
Amount of Rain 10 to 20", 20 to 30"
Advantages Deer Resistant, Attract Butterflies, Groundcover, Native, Extended Bloom Time (more than 4 weeks), Good Rockgarden or alpine plant, Great for Mass Plantings
Special Groups High Country Gardens Exclusive, High Country Gardens Introduction
Ideal Region Western Only, Hot Desert, Southwest, West
Neonicotinoid-Free Yes - Learn More
Ships to Hawaii, Alaska & Canada No

Planting Guides

Tips On Growing Calylophus (Sundrops)

Calylophus (Sundrops) is a showy genus of native western species.  Closely related to Oenothera, but these perennials are day bloomers.

Preferred growing conditions:

  • Plant in fast draining sandy, rocky or light loam soils. Some species (C. hartwegii) are fine with clay in arid climates.
  • All need full sun conditions.
  • Mulch with gravel or other coarse texted non-bark mulch.
  • Keep regularly watered for the first growing season to establish the roots. Thereafter, infrequent but deep watering is preferred.
  • Fertilize lightly in fall with Yum Yum Mix/compost blend.

Special comments:

  • Deadheading is not needed as these plants are naturally long blooming. Cut back hard in early to mid-spring to a height of 2 to 3 inches.

View more Planting Guides, or download our complete Planting Guide for tips on caring for your plants when you receive your order, as well as planting instructions for Perennials, Spring-Planted Bulbs, Fall-Planted Bulbs, Cacti & Succulents, Xeric Plants and more.


Plant Shipping: Buy now and we will ship your order at the ideal planting time for your region. Expected ship week will display on the cart at checkout after you enter your zip code. Spring-Planted Perennial and Bulb orders will ship from Feb 25 through mid-June, warmest zones first.

Most plant and bulb orders arrive within 2-6 days, or less, of leaving our greenhouses in Colorado. This prompt delivery is provided without additional express charges.

Grass Plugs Will ship at planting time in spring, beginning in late February.

Wildflower Seed & Grass Seed Orders ship within 2-3 days.

Standard shipping costs are $4.99 and up, depending on the size of the order.

Make Fast Even Faster: For ‘Rush’ same week delivery, please call customer service at 800-925-9387.

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Reviewsby PowerReviews


by PowerReviews
High Country GardensCalylophus hartwegii High Plains Yellow

(based on 2 reviews)

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High hopes but disappointing


from Beeville, Texas

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Verified Buyer

Comments about High Country Gardens Calylophus hartwegii High Plains Yellow:

Due to the harshness of our summers, I always order a single specimen of a species I am interested in. I also spend a lot of time studying growing needs to make sure a plant meets the requirements for surviving the brutal South Texas summers. The Calyophus was planted next to a Gaillardia and while the latter thrived, bloomed all summer and self-seeded in its first season, the Calyophus fizzled after putting out a single bud which never opened. It may have been weak to begin with and I might have had better luck if I'd ordered multiples, but this is one I would not recommend for those living in similar climates.

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  • Personal

(1 of 1 customers found this review helpful)


Beautiful plant


from Farr West, UT

About Me Avid Gardener

Verified Reviewer


  • Accurate Instructions
  • Attractive
  • Hardy
  • Healthy


  • No Cons They Are Exactly

Best Uses

  • Garden
  • Outdoors

Comments about High Country Gardens Calylophus hartwegii High Plains Yellow:

Plant came healthy and already have flowers, very happy with this plant.

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  • Personal

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Q & A

Suggested Companion Plants:

USDA Hardiness Planting Zones

To determine if a plant is sufficiently cold hardy, the USDA created numbered zones indicating winter low temperatures; the lower the zone number the colder the winter.

  • If the coldest winter temperature expected in your area is -15°F (zone 5) then any plants rated zones 3-5 will survive the winter temperatures in your area.
  • If you live in very warm winter areas (zones 9-11) plants with zones 3-4 ratings are not recommended. The lack of freezing winter temperatures do not provide a time for winter dormancy (rest).

Find Your Planting Zone:

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