Gambelia Species, Island Bush Snapdragon, Showy Greenbright

Gambelia speciosa

Family: Plantaginaceae
Genus: Gambelia
Species: speciosa (spee-see-OH-suh) (Info)
Synonym:Antirrhinum speciosum
Synonym:Galvezia speciosa
Synonym:Galvezia speciosa var. pubescens



Tropicals and Tender Perennials

Water Requirements:

Drought-tolerant; suitable for xeriscaping

Average Water Needs; Water regularly; do not overwater

Sun Exposure:

Full Sun

Sun to Partial Shade

Light Shade




Foliage Color:

Unknown - Tell us


24-36 in. (60-90 cm)

36-48 in. (90-120 cm)


24-36 in. (60-90 cm)

36-48 in. (90-120 cm)


USDA Zone 9a: to -6.6 C (20 F)

USDA Zone 9b: to -3.8 C (25 F)

USDA Zone 10a: to -1.1 C (30 F)

USDA Zone 10b: to 1.7 C (35 F)

USDA Zone 11: above 4.5 C (40 F)

Where to Grow:

Unknown - Tell us


Unknown - Tell us

Bloom Color:


Scarlet (dark red)

Bloom Characteristics:

This plant is attractive to bees, butterflies and/or birds

Bloom Size:

Unknown - Tell us

Bloom Time:

Mid Spring

Late Spring/Early Summer

Mid Summer

Late Summer/Early Fall

Mid Fall

Other details:

Soil pH requirements:

Unknown - Tell us

Patent Information:

Unknown - Tell us

Propagation Methods:

From semi-hardwood cuttings

From seed; sow indoors before last frost

From seed; direct sow after last frost

Seed Collecting:

Unknown - Tell us


This plant is said to grow outdoors in the following regions:

Bonsall, California

Carlsbad, California

Elk Grove, California

Malibu, California

Richmond, California

San Rafael, California

Spring Valley, California

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Gardeners' Notes:


On Mar 11, 2014, econte530 from San Rafael, CA wrote:

San Rafael, CA. Part to full sun.

Gorgeous foliage year round, but doesn't bloom as much as I thought it would. I planted one last june? in a brand new raised bed that everything else is thriving in. It is about 3' tall and wide, but I have trimmed it a few times. It only bloomed late summer and early fall. Hopefully this year it will have a longer bloom time. Deer love it, so a fence or spray is necessary.


On May 12, 2013, cloud91977 from Spring Valley, CA (Zone 10a) wrote:

Here in SS zone 24, USDA zone 10w, I have three plants growing around the yard.

In a mostly shaded spot (under a magnolia), in sandy loam, this plant grows slower, taller, and blooms much less than those in the sun. It gets hosed off every couple of weeks when it's hot but otherwise survives on what little winter rainfall we get here in So Cal. After two years it's about 3' high and a little less wide.

In an open sunny spot, exposed to hot winds, the plant is wider, lower, and blooms profusely in the spring and then enough to keep the hummers coming all summer. It grows in soil that is heavier in clay content, gets watered deeply only when it rains heavily, and otherwise is hosed off lightly every week or two during the summer. After two years it's probably... read more


On Sep 23, 2006, Gina_Rose from Hollywood, FL (Zone 10b) wrote:

I rated it neutral b/c I haven't grown it, but would like to. Here's info I've collected so far:
The width I gave the plant is mainly for the plant when it reaches maturity, but it's a spreading groundcover and I read reports that it has spread to up to 15'.
It's a native to CA, the Channel Islands, and it's habitat is rocky cliffs & canyons.
If grown near the coast, it likes full sun and can be drought tolerant, but inland it needs more shade and water.

It's considered endangered in some of it's native areas.