This section is from the book "The Gardener's Monthly And Horticulturist V24", by Thomas Meehan. See also: Four-Season Harvest: Organic Vegetables from Your Home Garden All Year Long.
There are two varieties of Ageratum that I have found growing in the river bottom, near me, and on the Post Oak hills, beyond the river. The variety growing in the bottom is sometimes two-feet high, and the fringe-like blooms are pale blue, fading to white. The roots are perennial, and if killed by frost put up again whenever we have a week or two of warm weather. It is a vigorous grower. The ageratum of the sandy " Post Oak " land is low and bushy in growth, like the dwarf ageratum of floral catalogues ; the color is a lovely purplish blue. I planted one in a pot, and the root threw out white, succulent shoots, underground, that growing near the surface put up leaves that grew into bushes, and it spreads thus somewhat like a verbena. The pot looked as if little seed plants were coming up all over it, when really they are root plants. I think this variety a valuable acquisition as a bedding plant. Indigenous plants stand the variations, the heat and dryness of our climate, much better than imported plants.