Shrub
Thryallis
Galphimia gracilis
Varieties We Carry
StandardGalphimia gracilis
Sizes & Pricing
3 galFrom$14.95
Fresh this week. Last restocked Jun 25.
LightFull Sun, Part Sun
WaterLow
Mature size5-9 feet × 4-6 feet
About Thryallis
Thryallis (Galphimia gracilis) is a fast-growing tropical shrub native to Mexico and Central America, producing clusters of bright golden-yellow flowers from summer through fall. It thrives in NE Florida's warm climate as a landscape shrub, butterfly attractor, or informal hedge, rebounding readily from roots if damaged by an occasional freeze. Starting at $14.95.
Plant details
- Bloom Season
- Summer, Fall
- Flower Color
- Yellow
- Growth Rate
- Fast
- Foliage
- Evergreen
- Soil
- Sandy, Loam, Well-drained
Best planting months
Recommended forZone 9b · St. Augustine, FL
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This monthGood windowOther months
Seasonal care
Bloom season. Good planting window.
Bloom season. Handles summer heat well once established.
Bloom season. Ideal planting window.
Retains foliage through winter.
Care essentials
Light
Thrives in full sun; tolerates part sun but blooms best with at least 6 hours of direct sun — a prime spot in NE Florida's landscape for maximum golden-yellow flower production.
Water
Drought tolerant once established; water regularly during the first season to establish roots, then reduce irrigation — overwatering leads to root rot in well-drained sandy Florida soils.
Soil & Fertilizer
Grows well in NE Florida's sandy or loamy, well-drained soils; apply a balanced slow-release fertilizer in spring, but avoid excess nitrogen which promotes leggy growth at the expense of flowering.
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Common questions
Is Thryallis a good plant for St. Augustine?
Thryallis is a shrub for Zone 9b coastal Florida gardens, reaching 5-9 feet × 4-6 feet.
Care information verified from
Last reviewed February 2026. Our care guidance comes from trusted horticulture sources and decades of helping St. Augustine gardeners. Conditions here can vary dramatically from one area to the next, so come ask us and we'll tailor it to your yard.