PlantFiles: Thryallis, Golden Thryallis
Galphimia gracilis

I Have had this plant for over 2 years in my garden, and since have added a couple more of them. These plants love full sun but I have found that mine like a little supplemental water occasionally during the heat of summer. This winter we had 2 nights of back to back lows of 21oF, this did not faze this plant only a handful of leaves on this 5 feet shrub turned a slight redish color, otherwise it was business as usual, and there was no overhead protection. This plant as others have pointed out here is pure sunshine. Mine bloom here in zone 8B from June-November. Each flower seems to produce a seed pod, however, I have never had problems with volunteers. I have mine planted with firebush, which where knocked to ground during that freeze. If you have a sunny location and don't mind this getting 5-7 feet tall and constantly covered in dainty yellow flowers, then this is worth a try (it can be pruned hard) certainly in zone 8B maybe even 8A.

This bush is a strong grower that flowers all summer. It will grow with no help after it is established . It will not become a problem as it does not spread except ocasionally . Ed Brandon FL eamusg@juno.com

I would emphasize this plant is a "pure sun play" -- mine only get about 5 hours a day, and while healthy, they do tend to get a bit leggy. Having said that, they are reliable bloomers in late summer even in that situation and I just whack 'em back in the late winter to keep them looking well rounded and full. Great plant and a really nice, semi-wild looking shrub with clear, bright yellow blooms for the informal garden. Also a great choice if you wanted to fill a large area with a lot of blooming shrubs as a backdrop. Even when not in bloom it's structure and leaf color are interesting.

This is a great addition to the potted garden as well as the beds. It will tolerate salty conditions as well as dry soil. Blooms Blooms Blooms all the time in FL.

San Antonio, Texas 3/18/93

Excellent heat tolerant, xeriscape plant. It is a robust bloomer which tolerates a variety of well drained soils. Extreme cold will cause it to die back to the ground; however, it will resprout in the spring. Mild cold causes the leaves to turn a bronzy to reddish color. Poor salt tolerance requres it to be shielded by other plants in coastal regions, but it must receive a fair amount of sunlight in order to encourage blooms and discourage legginess. To increase fullness and thus more blooms, it can be pruned after the last freeze.

Very showy and easy to grow. Blooms almost continually. Will become leggy in low-light. Tolerant of brief periods of very cold weather. Branches are brittle and break easily. Will rot and die if over-watered. Self-seeding but not so much as to be a nuisance, just enough so that you can pot up some new bushes which grow very rapidly to a good size. Trim in the winter to promote a thicker bushes.