Thyrallis or Yellow Plumbago
Galphimia glauca (Thryrallis glauca)
Thyrallis is a handsome small to medium size evergreen shrub with season long interest that is native to Mexico and Guatemala. Plants have a rounded habit, blue-green leaves, and spring to fall terminal spikes of yellow flowers. Plants can serva as general purpose evergreen shrubs in warm climates and as summer annual accents in colder climates. They work well in shrub borders, hedges, masses, and large containers.
Plant Habit or Use:
Shrub, small shrub, medium shrub, topiary, tropical
sun, partial sun
Bright yellow, small 0.5 inch flowers in dense 2 inch to 4 inch terminal spikes.
Spring, summer, fall
Small brown 3-part capsules, not ornamental.
4 ft to 6 ft (9 ft)
3 ft to 4 ft (6 ft)
Explanation of the Earth–Kind® Index breakdown
- Heat Tolerance: High Heat Tolerance
- Water Requirements: Medium Water Use
- Soil Requirements: Medium Soil Requirements
- Pest Tolerance: High Pest Resistance
- Fertility Requirements: Medium Fertility Requirements
USDA Hardiness Zones:
9, 10, 11
Regions that intersect these hardiness zones:
Click image for enlarged map of USDA Hardiness Zones
Region E - Upper Rio Grande• Region F - Hill Country and Central Coast• Region G - Southeast Texas• Region H - Rio Grande Valley
This species should be more frequently grown where cold hardy, very marginal in USDA zone 8b. Few problems, sometimes reported to be difficult to root from cuttings.