General Plant Information (Edit)
Plant Habit: Shrub
Life cycle: Perennial
Sun Requirements: Full Sun to Partial Shade
Water Preferences: Mesic
Soil pH Preferences: Slightly acid (6.1 – 6.5)
Neutral (6.6 – 7.3)
Slightly alkaline (7.4 – 7.8)
Minimum cold hardiness: Zone 7a -17.8 °C (0 °F) to -15 °C (5 °F)
Maximum recommended zone: Zone 11
Plant Height: 6-10 feet
Plant Spread: 6-10 feet or more
Leaves: Glaucous
Deciduous
Other: Gray-green, summer deciduous
Fruit: Other: 1-1.5 inch long bristly capsule containing numerous tiny seeds
Fruiting Time: Late summer or early fall
Fall
Flowers: Showy
Fragrant
Flower Color: White
Bloom Size: 3"-4"
Flower Time: Late spring or early summer
Summer
Underground structures: Rhizome
Wildlife Attractant: Bees
Propagation: Other methods: Cuttings: Root
Miscellaneous: Goes Dormant
Awards and Recognitions: RHS AGM

Image
Common names
  • Matilija Poppy
  • California Tree Poppy
  • Coulter's Matilija Poppy
  • Fried-Egg Flower

Photo Gallery
Location: Hanbury Botanical Gardens, Italy
Date: 2017-06-14
Location: British Columbia
Date: July 2013
Stand of Romneya

Date: 2008-09-20
Location: Washington 8b
Date: 2020-06-10
Location: Washington 8b
Date: 2020-06-11
Location: Palo Alto, CA
Date: 2013-06-08
at the Elizabeth Gamble Garden
Photo by wcgypsy

Date: 2008-09-20
Location: Los Angeles Arboretum, Arcadia, California
Date: 2012-05-27
Location: Santa Barbara Botanical Gardens, CA
Date: 2010-05-05

Date: 2008-09-20
Location: San Diego, CA
Date: 2019-06-09
the common name "fried-egg flower" makes a lot of sense especiall
Location: Palo Alto, CA
Date: 2015-05-02
Elizabeth Gamble Garden
Location: Malibu Creek State Park, Calabasas, California
Date: 2009-10-07

Photo courtesy of Annie's Annuals and Perennials
Location: Los Rios District , SoCal
Date: 2021-05-15
Location: Los Angeles Arboretum, Arcadia, California
Date: 2012-05-27

Date: 2011-05-15
Credit USFWS

Photo courtesy of Joy Creek Nursery
  • Uploaded by Joy
Location: Santa Barbara Botanical Gardens, CA
Date: 2010-05-05

Photo Courtesy of Secret Garden Growers.
  • Uploaded by Joy

Photo courtesy of: Rod Waddington
Photo by wcgypsy
Location: Washington 8b
Date: 2020-10-06
Location: Los Rios District , SoCal
Date: 2021-05-15
Location: Botanical garden UG, Gent, Belgium
Date: 2015-09-06
Location: Botanical garden UG, Gent, Belgium
Date: 2015-09-06
Location: Botanical garden UG, Gent, Belgium
Date: 2015-09-06
Location: Botanical garden UG, Gent, Belgium
Date: 2015-09-06
Location: Botanical garden UG, Gent, Belgium
Date: 2015-09-06

Photo courtesy of Annie's Annuals and Perennials
  • Uploaded by Joy
Location: Los Rios District, SoCal
Date: 2021-05-15
Location: Los Rios District , SoCal
Date: 2021-05-15
Location: Los Rios District , SoCal
Date: 2021-05-15
Location: Los Rios District , SoCal
Date: 2021-05-15
Comments:
  • Posted by KFredenburg (Black Hills, SD - Zone 5a) on Jun 6, 2020 4:38 PM concerning plant:
    Late-summer white flowers up to 6 inches across with crinkled satiny petals on branching stems up to 8 feet tall.
    For best results (if planting more than one of these plants), space each plant at least 3 feet apart.
    Landscape uses:
    Give California tree poppy a sunny site where there is plenty of room for its invasive roots. Use in arrangements, first searing the cut stems over a flame.
  • Posted by Mindy03 (Delta KY) on May 9, 2012 5:27 PM concerning plant:
    Valuable source of nectar and pollen for honey bees.
  • Posted by Marilyn (Kentucky - Zone 6a) on May 25, 2013 1:03 AM concerning plant:
    "Romneya coulteri (Coulter's Matilija poppy or Californian tree poppy) is species of flowering plant in the poppy family. Native to southern California and Baja California, it grows in dry canyons in chaparral and coastal sage scrub plant communities, sometimes in areas recently burned. It is a popular ornamental plant, kept for its large, showy flowers.

    This is a shrub which may exceed two meters in height, its woody stem growing from a network of rhizomes. The gray-green, waxy-textured leaves are each divided into a few lance-shaped lobes, the blades growing up to 20 centimeters long. The inflorescence is a large, solitary flower with six crinkly white petals each up to 10 centimeters long. At the center of the flower is a cluster of many yellow stamens. The fruit is a bristly capsule 3 or 4 centimeters long containing many tiny seeds.

    This plant bears the largest flowers of any species native to California, rivaled only by Hibiscus lasiocarpos. It was nominated for the honor of California state flower in 1890, but the California poppy won the title in a landslide.

    It has gained the Royal Horticultural Society's Award of Garden Merit."

    Taken from wikipedia's page at: http://en.wikipedia.org/wiki/R...

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