Jasminum : Greenhouse Plants
C – cool, minimum of 7°C (45°F) / T – tropical, minimum of 18°C (65°F)
Greenhouse Jasmines are divided as to whether they are almost hardy and will grow in the frost free or cool house or in tropical temperatures. Most, however, are worth growing for their perfume which will pervade the whole atmosphere of the greenhouse. The most easily obtainable is jasminum polyanthum from China which graces British garden centres in great numbers. This is very fragrant and well able to stand cool conditions. The colder the temperature the later its white flowers will be. The bought plants are usually forced; in the cool house flowering is in the spring. It is rampant and if confined to a pot will need pruning after it has flowered, which consists of cutting those long shoots that have just flowered back to within a node of older growth. (Primulinum and Jasminum mesneyi) also from China is another nearly hardy plant with bright yellow flowers, also in spring. However, this is not grown for its scent. There should be no problems with either of these.
If bought in bud Jasminum polyanthum may lose these if it is suddenly placed in a very cool house or subjected to cold draughts. Jasminum rex from Thailand and Cambodia is one for the tropical house but unfortunately is scentless. It makes up for this in the beauty of the large white flowers. J. sambac from India and J. Nitidum from the Admiralty Isles are also tropical and both have white scented flowers.