The pretty blue plumbago with its jasmine-like flowers is one of the most popular of greenhouse plants. It can be grown in a soil of two parts fibrous loam, and one part leaf-mould and silver sand mixed. It can be trained up the rafters or pillars of the greenhouse, or for use as a decorative pot plant it can be trained over a trellis.
Pot or plant in February or March and syringe daily until the flowers show. Then apply weak stimulants twice a week. When the flowers have faded prune back to within an inoh of the base. Propagate by seeds sown on sandy peat in early spring or by cuttings of side shoots taken at any time from February to August.
There is a white form of P. capemis which is often grown as a companion to the common blue form, and the species
P. rosea is rose-coloured. Tlus last requires rather warmer temperature than the P. ctipensu).
Polianthes. This is commonly known as Tuberose, and is a white-flowered bulb, valued because of its fragrance. Pot in Joam, leaf-mould, decayed manure and silver sand.
Put the bulbs about two-thirds of their depth in the soil, and plunge the pots to their rims in bottom heat. Water once only before growth begins, afterwards remove to a shelf near the glass.
If preferred the bulbs can be grown by starting them in a cold frame and afterwards removing them to the jrreenhotise, in the same way as spring flowering bulbs are cultivated. When the plants are growing freely, they should be jrivrn stimulants in the form of fertilizer. Bulbs must be discarded after they have flowered as they are no longer of use.