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The California glory flannel bush is the most spectacular flowering shrubs among our cultivated garden plants. As seen in the images, the springtime flowering cycle covers the stems and branches with an abundant display of large star shaped yellow flowers. This cultivar grows very fast and develops an upright form when young, 15-20 ft. tall, and as wide. Leaves grow 1-2 in. across with 3 round lobes. Flowers are clear yellow above, rusty brown below.

This popular flannel bush cultivar is best suited to dry garden zones in combination with other drought adapted native plants. Experience has shown that it grows well with normal winter rains in the Inland Empire and should not receive summer water due to disease issues. A combination of sunny exposures and good drainage is also essential for survival and success. It is not unusual for this cultivar to live 6-8 years before dying, however, many people value them in spite of these challenges. Plant them on slopes in background areas and in where there is sufficient space to accommodate their robust size.

Water Needs

The California glory flannel bush is highly adapted to sunny garden locations on well drained soils and with no supplemental water during summer. All species and cultivars of the flannel bush are highly sensitive to disease and excessive growth when they receive summer water in dry climate areas of southern California. Young plants should be planted in the fall and provided with sufficient moisture to sustain them until the winter rains; no additional watering is recommended after the first winter.

Irrigation Schedule and Graph

Low Water Use Plants

Irrigation Schedule 1

  Jan* Feb* Mar* Apr May Jun Jul Aug Sep Oct Nov* Dec*
Runs per Month 0x to 2x 0x to 2x 0x to 2x 1x 1x 1x 1x 1x 1x 1x 0x to 2x 0x to 2x
Inches per Run 1" 1" 1" 1" 1" 1" 1" 1" 1" 1" 1" 1"
Inches per Month 0" to 2" 0" to 2" 0" to 2" 1" 1" 1" 1" 1" 1" 1" 0" to 2" 0" to 2"

Range of supplemental summer water: 7"
Range of supplemental winter water: 0"-10"

  Jan* Feb* Mar* Apr May Jun Jul Aug Sep Oct Nov* Dec*
For more information on how to use this Irrigation Schedule and Graph, follow this link.

For information how to calculate your irrigation system’s schedule and precipitation rate, please follow this link.

Plant Properties

Plant Type: Shrub, Native
Foliage Character: Evergreen
Habit: Upright, Robust, Mounding, Dense
Growth Rate: Short-lived, Fast
Height: 15 ft. - 20 ft.
Width: 15 ft. - 20 ft.
Water Needs: Low 1
Foliage Color: Dark green
Flower Color: Yellow
Flower Season: Spring
Soil Adaptations: Well-draining soil
Exposure Adaptations: Heat, Drought, All day sun
Function: Slopes, Flowering accent plant, Background plant, Attracts butterflies


On young plants, you can lightly prune tips of branches to increase branching density, if desired, after blooms fade, around July (2). If growing in windy areas, keep a more open form because they have shallow roots and can blow over (3) Try to avoid pruning older plants much and do not cut into old wood (2). The hairs on the leaves are VERY irritating to skin, lungs, etc., enough so, that many people avoid growing this beautiful plant. If pruning, always wear gloves, long sleeves, and eye protection. Depending on your sensitivity you may want to change clothes and shower immediately after pruning Fremontodendron (3). They are extremely sensitive to summer water, and any amount of water or irrigation during the heat of summer is likely to kill them. Usually this is not one for the novice gardener. Make sure you really know what you are getting into (S).



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