Ageratum houstonianum (40 days from transplanting) Also known as Flossflower. A cutting ageratum with long stems. Blooms held nicely through a rainy summer, all the way from July 20 to Oct. 5 killing frost. Covered with blossoms, great for summer borders. Annual. ③
4811 Dondo Blue
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Annual. Its name means ‘not growing old’ as the flowers retain color for a long time. Also known as Flossflower. Covered with blossoms, great for summer borders.
Culture: Start indoors at 80° for 6–8 weeks before last frost; grow on at 60–65°. Set 9–12" apart. Likes full sun. Water in hot weather. Extreme temperatures inhibit flowering. Will not tolerate frost. Cut for vase when flowers are first opening. ~7,000 seeds/g.
All flowers are open-pollinated except where noted.
Days in parentheses after a variety indicate days to first bloom.
For the latest results of our germination tests, please see the germination page.