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Conoclinium coelestinum

Conoclinium coelestinum
hardy ageratum; mistflower
The other blue (pompom) flowers in the picture above belong to its neighbor, devil's bit scabious.

Synonym(s) Eupatorium coelestinum
Common name hardy ageratum; mistflower
Family asteraceae
Life cycle perennial (Z4-11)
Flowers blue (late summer-fall)
Size 2'
Light sun-part shade
Cultural notes ordinary garden soil

The clear blue flowers, which arrive in late summer, are most welcome in our summer-weary garden. For years I wondered why this plant is not more popular – it would spread a little by its roots, but wasn't too aggressive in our garden. In recent years, however, I have come to appreciate how it can take over in the border. It makes a tangle of brittle shallow roots; while they aren't hard to pull up, some are always left behind, so it is difficult to weed out. So in most areas of our garden, this is now unwelcome – but I still allow it to do its thing in the side garden, where I first introduced it.

We left this plant behind in our Pennsylvania garden (and wish it well); we don't grow it in Houston.

One or more images of this plant are included in my stock photo catalog

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