This section is from the book "The Gardener's Monthly And Horticulturist V18", by Thomas Meehan. See also: Four-Season Harvest: Organic Vegetables from Your Home Garden All Year Long.
These are hard-wooded plants, but associate best with soft-wooded plants, and should only be grown in a house that is kept well heated during winter. Those employed for bedding purposes make nice pot plants, but the best of the family is B. longiflora, which produces a profusion of most elegant and sweet-scented white flowers during the winter. It is a troublesome plant, but worth any amount of trouble. Strike cuttings of the young wood in a brisk moist heat in March. Pot off as soon as rooted in five-inch pots, in a mixture of equal parts loam and peat, and a sixth part of the whole bulk of silver-sand. Put them into the warmest place you have, but they must not be closely shut up, and the foliage must be frequently syringed. A fortnight after this potting pinch out the points of all the shoots to promote a bushy habit. Winter them in a temperature of 50°, and in February shift them into eight-inch pots, and after this potting put them in a good growing temperature, and as the season advances move them to cooler quarters, so that by the middle of August they may be in a light airy house, to ripen the wood and prepare them for flowering.
As soon as flowers appear put them into a temperature of 60°. Keep them very clean, and they will continue to flower for four or five months.
The bedding varieties of Bouvardia are more hardy than the lovely longiflora, and may be prepared for the embellishment of the conservatory by a very simple course of culture. In the middle of May secure a sufficient number of plants of the sorts required. Newly-made plants from spring cuttings will not do, but old scrubby ugly ones will answer perfectly. Cut them rather close, so that when they make new shoots they will become neat round bushes, and plant them out in a sunny spot. Give water as required. In the first or second week of July pinch out the points of all shoots, and give no more water. About the middle of September take them up carefully, and pot them in a light loamy mixture, taking care to injure the roots as little as possible. Give them a good watering, and then put them near a wall out of doors where the sun will not shine on them, and keep them regularly sprinkled and watered. In the early part of October take them into the greenhouse, and very soon they will begin to flower and make a splendid show.
B. Vreelandi, which is a capital bedding plant, is also one of the best for this rough-and-ready course of culture for the production of winter flowers. - Gardener's Magazine.