Thryallis (Galphimia glauca)

Grow thryallis in your yard to add a beautiful ray of sunshine from this easy-care, sun-loving shrub. A beautiful tropical plant, thryallis is loved for its long bloom season; it blooms on and off all spring, summer, and fall in the North, and all year long in frost-free regions. It produces small spikes of beautiful golden-yellow flowers that give it a soft, almost cottage-garden texture. Thryallis is hardy outdoors only in frost-free Zones 10 and 11. In these regions, as a landscaping shrub, it can grow up to 9 feet tall and 6 feet wide if unpruned. In cold-winter regions, thryallis typically only grows up to 5 feet tall and 4 feet wide.