Grow thryallis in a spot that sees full sun (at least 6 to 8 hours of direct sun each day) to maximize its flowering potential. This sun-loving plant will tolerate part shade (areas with morning shade and afternoon sun), but is more likely to grow lanky and bloom less.
- Light Needs: Full Sun
- Watering Needs: Water thryallis when the top inch of the soil dries out.
Thryallis is a small evergreen tropical shrub that grows to a maximum height of about 6 ft (0.6 m) and about as wide. It grows moderately fast into a neat rounded shape with many slender stems that are reddish when young. This shrub forms a dense and twiggy mass covered in light green oblong leaves. These are arranged oppositely and are 1-2 in (2.5-5 cm) long and take on bronze tones during cooler periods. Thryallis smothers itself in beautiful yellow blossoms in late summer and fall although some flowers can be expected at all times if warm temperatures are maintained. The yellow flowers are about 3/4 in (2 cm) in diameter and are held in 4-6 in (10-15 cm) clusters at the stem tips. Flowers are followed by interesting three part seed capsules.