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Hayes Iva, also known as San Diego marsh elder, is an evergreen shrub with a naturally sprawling habit with branches extending to 2 - 3 ft. tall and plants reaching 4 - 5 ft. wide. It is characterized by pale green leaves and spikes covered with tiny yellow flowers during spring.

Hayes Iva is a tough plant that is highly suited to sunny exposures and summer moist or dry conditions. It grows well in both clay and loam type soils throughout the Inland Empire. Throughout this range, Hayes Iva is most often grown on banks and slopes, in parkways and adjacent to natural areas as a low maintenance ground cover. It can be easily trimmed along walkways and topped to achieve a neat appearance.

Water Needs

Hayes iva is well adapted to all parts of the Inland Empire with normal winter rains and low amounts of summer irrigation. The chart shown below provides a recommended baseline guide to the monthly irrigation schedule and volume of supplemental water needed to maintain healthy growth throughout the average year. It should be noted there are several months marked by an asterisk (*) when winter rains can provide sufficient moisture and irrigation is not needed. The high and low range of moisture indicates it can grow with varying amounts of water; more supplemental water commonly results in a longer growing season and spreading more rapidly.

Irrigation Schedule and Graph

Moderate Water Use Plants

Irrigation Schedule 3

  Jan* Feb* Mar* Apr May Jun Jul Aug Sep Oct Nov* Dec*
Runs per Month 0x to 3x 0x to 3x 0x to 3x 2x to 3x 1x to 2x 1x to 2x 1x to 2x 1x to 2x 1x to 2x 2x to 3x 0x to 3x 0x to 3x
Inches per Run 1" 1" 1" 1" 1" 1" 1" 1" 1" 1" 1" 1"
Inches per Month 0" to 3" 0" to 3" 0" to 3" 2" to 3" 1" to 2" 1" to 2" 1" to 2" 1" to 2" 1" to 2" 2" to 3" 0" to 3" 0" to 3"

Range of supplemental summer water: 9"-16"
Range of supplemental winter water: 0"-15"

  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, Ground cover, Native
Foliage Character: Evergreen
Habit: Spreading, Dense
Growth Rate: Moderate
Height: 2 ft. - 3 ft.
Width: 4 ft. - 5 ft.
Water Needs: Moderate 3
Flower Color: Insignificant
Flower Season: Spring
Soil Adaptations: Well-draining soil, Clay, Alkaline soil
Exposure Adaptations: Heat, Drought, All day sun
Function: Slopes, Restoration, Parks and open space, California native, Background plant


As needed, cut back hard in the winter to reinvigorate. This is not necessarily every year (2). Large plantings of hayes iva can be cut back with a brush mower (3).



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