Gardening Question: Download Questions PDF
The garden section of one of my magazines referred to a planting of tweedia. It looked beautiful, but I can’t find the plant listed in any of my gardening books. Can you tell me a little about it?
Even gardening books that talk about this plant, Tweedia caerulea, usually use its former name, Oxypetalum caeruleum. It is also called southern star and blue milkweed, since it is a member of the milkweed family. It is a native of the tropics of South America, so must be grown as an annual in the United States. Not really a vine but more of a subshrub, it has twining stems to three feet tall. Its most spectacular feature is its flower color, described as a powder blue tinged with green that makes it almost turquoise, becoming lilac as it ages.
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