Colin Mills, compiler of the Hortus Camdenensis, died in late November 2012 after a short illness. As he always considered the Hortus his legacy, it is his family's intention to keep the site running in perpetuity. It will not, however, be updated in the near future.

Eupatorium sordidum Less.

Half hardy, bushy, rounded shrub with young stems covered in red woolly hairs, opposite, ovate, toothed leaves with red hairs beneath, and terminal corymbs, to 12cm across, of fragrant, violet flowers, mainly in winter.  To 3m.  [RHSE, Hortus].

Horticultural & Botanical History

‘The fine foliage, excellent habit, and large loose spreading heads of light blue flowers, which terminate any shoot of this plant, make it exceedingly attractive, and its season of blooming, winter and early spring, when blue flowers are scarce, merits for it a place in every condition of plants’.  [Gard. Chron. 1854].  Introduced to Britain in 1849.  [JD].  ‘A soft-wooded suffruticose plant, of easy cultivation.  It may be grown in a pot, and flowers freely when not a foot high.  Any kind of light open soil will suit it.  It has hitherto been treated as a stove-plant; but, judging from its affinity to Ageratum, and from its present appearance, we think that if planted out in the open border in the month of May, it will grow luxuriantly during the summer months.  It increases readily by cuttings, treated in the usual way.’  [BM t.4574/1851].

History at Camden Park

Listed only in the 1857 catalogue [T.341/1857].


Published Feb 26, 2009 - 02:30 PM | Last updated Feb 23, 2010 - 01:42 PM

The image shows ovate, toothed leaves  and terminal corymbs of violet flowers.  Curtis's Botanical Magazine t.4574, 1851.

Eupatorium sordidum Less. | BM t.4574/1851 | BHL

Family Asteraceae
Region of origin


  • Bartlettina sordida (Less.) R.M.King & H.Rob.
  • Eupatorium ianthinum Hemsl.
  • Conoclinium ianthinum Morr.
  • Hebeclinium ianthinum Hook.
Common Name
Name in the Camden Park Record

Conoclinum ianthemum 

Confidence level high