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Description

A large mounding evergreen shrub that quickly grows 10-15 ft. tall, and that can eventually grow into a small tree to 25 ft. high. Bright green pinnately divided leaves have 5-7 leaflets with coarsely toothed margins. Showy bright yellow trumpet-shaped flowers occur in large clusters during spring and intermittently through summer. Long cylindrical seed pods become conspicuous during the summer.

Yellow bells is native to subtropical climate zones throughout Central and South America. Hardy to 28°F, it is easily damaged by frost, but recovers quickly during the spring flowering season. It grows best in well-drained soils with regular water through late spring to sustain robust growth and heavy flowering; pruning longer stems after the flowering cycle helps maintain good size and denser character. One cultivar, Tecoma stans var. stans 'Gold Star' is a mounding shrub to 10 ft. tall that has larger leaves and flowers for a very lush and colorful display.

Water Needs

Yellow bells is well adapted to sunny locations on well-drained soils in protected areas in the Inland Empire. It grows fastest and produces abundant flowers when provided with moderate amounts of water on a regular schedule. 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. As shown in the chart below, there are several months indicated 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 moisture in spring will help stimulate a more robust flowering cycle.

Irrigation Schedule and Graph

Low Water Use Plants

Irrigation Schedule 2

  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 to 2x 1x to 2x 1x to 2x 1x to 2x 1x to 2x 1x to 2x 1x to 2x 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" to 2" 1" to 2" 1" to 2" 1" to 2" 1" to 2" 1" to 2" 1" to 2" 0" to 2" 0" to 2"

Range of supplemental summer water: 7"-14"
Range of supplemental winter water: 0"-10"

 
0"-2"
0"-2"
0"-2"
1"-2"
1"-2"
1"-2"
1"-2"
1"-2"
1"-2"
1"-2"
0"-2"
0"-2"
  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
Foliage Character: Evergreen
Habit: Upright, Sprawling, Robust, Mounding
Growth Rate: Fast
Height: 10 ft. - 15 ft.
Width: 10 ft. - 15 ft.
Water Needs: Low 2
Foliage Color: Dark green
Flower Color: Yellow
Flower Season: Summer, Spring
Soil Adaptations: Silt, Loam, Clay, Calcareous soil
Exposure Adaptations: Heat, All day sun
Function: Wildlife value, Screening, Residential spaces, Raised planters, Parks and open space, Flowering accent plant, Espalier, Commercial spaces, Civic spaces, Banks, Background plant

Maintenance

Prune excessively long stems after flowering to maintain good form (4). May be trained as a sort of small multi-trunk tree-ish shrub, if desired (5). Pruning time is recommended for Spring, after danger of frost has passed, but before flower buds form (D).

References

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