The most popular jasmine for growing in a cool house or conservatory is the delightful Jasminum polyanthum, a species which bears clusters of whitefrom late November or early December to March. These blooms are very fragrant, and are pink in the bud stage which heightens their attractions. It can be grown in pots or in the border.
Another species for greenhouse cultivation is the spring-flowering, J. primulinum. This has bright yellow flowers and makes a useful pot plant, although it is better when planted out in the border. It needs much the same conditions as J. polyanthum,
Pot the plants in February or March in John Innes No. 2 Potting Compost, or plant out in a greenhouse border containing a similar compost. Water should be given freely from March to October but moderately for the rest of the year. The foliage should be syringed over daily in spring and summer.
When plants are being grown in 5- or 6-in. pots they need the support of three 3- to 4-ft. Canes, these being pushed in around the side of the pot and the long, slender growths tied around and around the canes to form a pillar. When the plants are covered in flowers this can be a delightful spectacle. Plants grown in the border will require the support of trellis or wire.
Pot-grown specimens can be stood out-side the greenhouse in a sunny position from June to September. I find that plants respond well to this treatment, as the wood ripens better than it would in the greenhouse, and flowering is more prolific the next season.
Jasmines are generally propagated by cuttings taken in the summer. Firm shoots should be selected, about 4 in. in length, and inserted in a sandy compost in a propagating frame with a temperature of 18 to 21°C. (65 to 70°F.).