Calylophus serrulatus

Dwarf Sundrops

This xeric wildflower, native to the western Great Plains, blooms most of the summer with a profusion of bright yellow flowers. This is a tough colorful species that gently re-seeds itself when happy. Drought resistant/drought tolerant plant (xeric).
Zones4 - 9
Advantages
Attract Butterflies
Bee Friendly
Deer Resistant
Native
Low Maintenance
Groundcover
Good Rockgarden Or Alpine Plant
Multiplies / Naturalizes
Light Requirements
Full Sun
Annual Rainfall
10 to 20"
20 to 30"
30 to 40" (with care)
Mature Height6-8" tall
Mature Spread15" wide
Bloom TimeLate spring to late summer
ShippingNo longer available this season. Learn More…
SizePlant - 2.5" Pot
SKUHC014487

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).

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SKU
HC014487

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Details
6-8" tall x 15" wide (cutting propagated). A little known native from the short grass prairies of the western Great Plains. But not for long! A heavy bloomer from late spring through the summer, this tough plant will be the star of your xeriscape. Dwarf Sundrops likes a lean, well-drained soil and a good shearing before the growing season in late spring to keep it looking tidy and loaded with flowers. A fine companion plant for Nepeta and Penstemon.
More Information
SKUHC014487
Item Package Size
Plant - 2.5" Pot
Common Name
Dwarf Sundrops
Botanical Name
Calylophus serrulatus
Zones
4, 5, 6, 7, 8, 9
Light Requirements
Full Sun
Flower Color
Yellow
Mature Height
6-8" tall
Mature Spread
15" wide
Bloom Time
Late spring to late summer
Ships As
Potted Plant
Soil Type
Low Fertility Soil, Well-Drained Soil
Soil Moisture
Drought Resistant / Waterwise
Amount Of Rain
10 to 20", 20 to 30", 30 to 40" (with care)
Advantages
Attract Butterflies, Bee Friendly, Deer Resistant, Native, Low Maintenance, Groundcover, Good Rockgarden Or Alpine Plant, Multiplies / Naturalizes
Ideal Region
Western Only
Planting Time
Spring / Summer, Fall
Native To
North America
Item Unit Of Measure
Plant
Ships To 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.
Shipping

No longer available this season.

As soon as your order is placed you will receive a confirmation email. You will receive a second email the day your order ships telling you how it has been sent. Some perennials are shipped as potted plants, some as perennial roots packed in peat.  The ‘Plant Information’ section describes how that item will ship. All perennials and spring-planted bulbs are packaged to withstand shipping and are fully-guaranteed. Please open upon receipt and follow the instructions included.

Perennials and spring-planted bulbs are shipped at the proper planting time for your hardiness zone. Perennial and spring-planted bulb orders will arrive separately from seeds. If your order requires more than one shipment, there is no additional shipping charge. See our shipping information page for approximate ship dates and more detailed information. If you need express shipping or have any questions, please call Customer Service toll-free at (800) 925-9387 or contact us by email.

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