Propagation—­is by dividing the roots, by cuttings, by suckers, or by seed; the latter is generally resorted to, where new varieties are desired.  Mr. George A. Lake, in an article on this subject (Gardeners’ Magazine, 1833) says:  “I speak advisedly, and from, experience, when I assert that plants raised from cuttings do not produce equally perfect flowers, in regard to size, form, and fulness, with those produced by plants grown from division of tubers;” and he more fully shews in another part of the same paper, that this appears altogether conformable to reason, as the cutting must necessarily for a long period want that store of starch, which is heaped up in the full grown tuber for the nutriment of the plant.  This objection however might be met by not allowing the cuttings to flower in the season when they are struck.

To those who are curious in the cultivation of this handsome species, it may be well to know how to secure varieties, especially of mixed colors; for this purpose it is necessary to cover the blossoms intended for fecundation with fine gauze tied firmly to the foot stalk, and when it expands take the pollen from the male flowers with a camel’s hair pencil, and touch with it each floret of the intended bearing flower, tying the gauze again over it, and keeping it on until the petals are withered.  The operation requires to be performed two or three successive days, as the florets do not expand together.

Soil &c. They thrive best in a rich loam, mixed with sand; but should not be repeated too often on the same spot, as they exhaust the soil considerably.

Culture.  The Dahlia requires an open, airy position unsheltered by trees or walls, the plants should be put out where they are to blossom, immediately on the cessation of the rains, at a distance of three feet apart, either in rows or in clumps, as they make a handsome show in a mass; and as they grow should be trimmed from the lower shoots, to about a foot in height, and either tied carefully to a stake, or, what is better, surrounded by a square or circular trellis, about five feet in height.  As the buds form they should be trimmed off, so as to leave but one on each stalk, this being the only method by which full, large, and perfectly shaped blossoms are obtained.  Some people take up the tubers every year in February or March, but this is unnecessary.  The plants blossom in November and December in the greatest perfection, but may with attention be continued from the beginning of October to the end of February.

Those plants which are left in the ground during the whole year should have their roots opened immediately on the close of the rains, the superabundant or decayed tubers, and all suckers being removed, and fresh earth filled in.  The earth should always be heaped up high around the stems, and it is a good plan to surround each plant with a small trench to be filled daily with water so as to keep the stem and leaves dry.