Winter hardy to USDA Zone 9b where it is grown in average, medium moisture well drained soils in full sun. Established trees have some drought tolerance. Site in locations protected from drying winds. Intolerant of frost. Propagate from seed.

This shrub is one of the best for shearing into low hedges. Use in foundation plantings beneath windows where its dense thicket of stems will discourage prowlers. Thryallis makes a great background plant for perennial beds. Mass this shrub for large scale groundcovers. Useful for preventing hillside erosion. Thryallis is also happy in containers as well as in greenhouses and conservatories where it is glad to brighten up the situation with quantities of bright yellow blossoms.