Alphabetical Plant Listing

Dendromecon harfordii (Island Tree Poppy)

Harford's Tree Poppy, Channel Island Tree Poppy, Island Tree Poppy, Dendromecon rigida ssp. harfordii


Dendromecon harfordii (Island Tree Poppy) is a handsome evergreen shrub or small tree clothed with smooth-edged, oval, blue-green leaves, 3 in. long (8 cm). A profusion of bright yellow flowers, 3 in. across (8 cm), smother the plant from spring into summer, and scattered blooms can be enjoyed throughout the rest of the year. A spectacular shrub worthy of inclusion in the landscape. A most beautiful California native that is easy to grow, gets very few pests and diseases, enjoys coastal influence and is one of the most dependable ever-blooming shrubs.

  • Grows usually up to 8-20 ft. tall and wide (2-6 m).
  • A full sun lover, this plant is easily grown in well-drained soils. Adaptable, it can handle a wide variety of soils, including clay and sand. Does well in dry part shade too. Water once per month in summer after the plant is established. Drought tolerant. Protect from strong winds.
  • Perfect for as a hedge or as a specimen or accent plant. Great in Mediterranean gardens.
  • Prune to shape or to thin after flowering.
  • No serious pest and disease issues. Keep an eye out for aphids.
  • Propagation by seed or stem cuttings. More easily propagated from stem cuttings in winter with intermittent mist and bottom heat.
  • Native to Santa Cruz and Santa Rosa Islands, off the coast of southern California.

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Requirements

Hardiness 9 – 10
Climate Zones 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Plant Type Shrubs, Trees
Exposure Full Sun, Partial Sun
Season of Interest Spring (Early,Mid,Late)
Summer (Early,Mid,Late)
Fall
Winter
Height 8' – 20' (240cm – 6m)
Spread 8' – 20' (240cm – 6m)
Spacing 240" (600cm)
Water Needs Low
Maintenance Low
Soil Type Clay, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Well-Drained
Characteristics Showy, Evergreen
Native Plants United States, California
Tolerance Drought, Dry Soil
Attracts Butterflies
Garden Uses Hedges and Screens
Garden Styles Coastal Garden, Mediterranean Garden

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The marmot, CountryMouse13 (Flickr)

While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.


Requirements

Hardiness 9 – 10
Climate Zones 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Plant Type Shrubs, Trees
Exposure Full Sun, Partial Sun
Season of Interest Spring (Early,Mid,Late)
Summer (Early,Mid,Late)
Fall
Winter
Height 8' – 20' (240cm – 6m)
Spread 8' – 20' (240cm – 6m)
Spacing 240" (600cm)
Water Needs Low
Maintenance Low
Soil Type Clay, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Well-Drained
Characteristics Showy, Evergreen
Native Plants United States, California
Tolerance Drought, Dry Soil
Attracts Butterflies
Garden Uses Hedges and Screens
Garden Styles Coastal Garden, Mediterranean Garden

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