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Golden Thryallis

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October 4, 2014
Several years ago we briefly showed a plant that was new to many gardeners. After growing this plant I’m convinced that Golden Thryallis is a must have plant for our Mississippi landscapes. Golden Thryallis is a fantastic fall flowering shrub that is known botanically as Galphimia glauca. Flowering starts beginning in July with the plants in full flower from August 1st until early winter. The flower clusters are a very bright yellow that simply can’t be missed. Adding to the color are the red stamens and pistil. The flower petal bases are also tinged with red. The flowers clusters produced are up to six inches long and the leaves are a bit oblong in shape and about one to two inches in length. The branches are initially a rusty brown which compliments the color of the flowers. In our Mississippi landscapes golden thryallis will grow into a rounded shrub three to four foot tall and two foot wide. Golden thryallis is very pruning tolerant and since the flowers develop on new growth pruning will not have a huge impact if the plants become untidy. Golden thryallis is deciduous in the winter and will die back to the ground around 25 degrees. It is surprisingly cold hardy, these plants survived 15 degrees this past winter. In north Mississippi treat the same as you would a butterfly bush. Prune the plant to the ground after the first frost and mulch heavily for winter protection. Plant golden thryallis in the full sun for best flowering performance as this will help keep the overall structure and appearance. I’m horticulturist Gary Bachman for Southern Gardening.

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