The Acacia, in its varieties, ranks amongst the most handsome and graceful, as well as most useful, of our flowering greenhouse plants. The sprays of flowers are excellent for arranging in vases, and the plants, when in flower, are admirable for general house decoration. Their season of flowering being from January till June - a time when all kinds of flowers, except forced ones, are generally scarce - renders them all the more acceptable. The Acacia, like many more good greenhouse plants, is not nearly so extensively cultivated as used formerly to be the case, the fashion for foliage plants which has prevailed having elbowed them aside. They are gradually, however, winning their way back to public favour. Foliage plants are all very well in their place, and are very useful, yet they lack the interest and attraction which flowering plants possess.

No doubt the fashion of table - decoration has been in a great measure the cause of the neglect of flowering greenhouse plants. Foliage plants are, as a rule, more suitable for this kind of work, not to speak of the much greater facility with which they can be got up to the requisite size, suitable for such purposes. "We think, however, that horticultural societies have also been much to blame by giving undue prominence to foliage plants, to the almost total exclusion of the others. We have heard exhibitors remark that it was almost useless to exhibit greenhouse flowering plants in a collection of mixed stove or greenhouse plants, as they could not compete against the fine-foliage stove-plants. When the accommodation is sufficient, both may be grown in proportions to suit circumstances; but the evil is that, where the accommodation is limited, we are almost of necessity confined to either one or the other kind of plants, only a few of the hardier kinds of Palms, Dracaenas, etc., being capable of cultivation in the ordinary greenhouse, and, on the other hand, the stove being much too hot for the general run of greenhouse plants.

The fashion for table-decoration is, no doubt, on the wane, so that in all probability "time, the great leveller," will in due course make things right again.

The list of Acacias is a very comprehensive one, consisting as it does of about 300 varieties. Some of them are natives of tropical climates, and some of more temperate climes. Most of the best of our greenhouse varieties are natives of the Australian continent, and none of them are very difficult to cultivate. The soil best suited to their wants consists of a mixture of equal parts of peat and good fibry loam, with a liberal allowance of sharp sand. Some of the varieties, such as Riceana, are admirably adapted for training up rafters, pillars, or for covering a wall, and thus grown, are very striking and beautiful objects. Some of the finer kinds also make grand plants for exhibition purposes. The Acacia is propagated by cuttings and from seed. If by cuttings, they should be taken off at a joint, and put in a properly drained pot or pan, filled up with soil, leaving about two inches of pure silver sand on the top in which to insert the cuttings; water them through a fine rose, cover with a bell-glass, and plunge the pot up to the rim in a moderate hotbed. After they are fairly rooted, they should be potted off* singly, in small pots, and replunged for a time in the hotbed or propagating-pit until they have again started into active growth.

As soon as the pots are filled with roots, they may be shifted into larger pots. It is not desirable in the case of any hard-wooded plants to give large shifts, as the roots always find their way to the sides of the pot, and therefore the roots may get matted there, and the centre of the ball just loose soil, by which the water escapes too readily, and the soil also holds too much water in suspension, and therefore soon gets soured. By giving small shifts, and more frequently, the whole ball will be full of roots, and they will be ready to absorb the water when it is given to them. The points of the shoots should be pinched out when they are young, so as to secure a bushy habit. They should be kept moderately close and warm during the first season, gradually hardening them off as autumn approaches, so that they may be the better able to stand the winter. In spring, when fresh growth commences, they may get another shift, say into 6-inch pots, using the soil as roughly as may be convenient. They may be kept close for a short time until they begin to root afresh, when a more liberal allowance of air may be given them.

About the middle of July they may be set out of doors in a well-sheltered, sunny place, and the pots plunged in a good deep bed of ashes, both to prevent the entrance of worms through the drainage - holes and also excessive evaporation. They may be allowed to stand here until the autumn, but must be attended to in the way of watering, etc. When the pots are full of roots they require a liberal supply. They must be housed again about the middle or end of October. If it be desired to raise plants from seed, it should be sown in February or March, the pot or pan plunged in a mild bottom-heat, and the seedlings pricked off singly into small pots as soon as they have made two pairs of leaves. The after-treatment should be the same as described above for plants raised from cuttings.

It is unnecessary to give a list of varieties, as this can easily be obtained from any catalogue. We may, however, just give the names of a dozen varieties which will give pretty general satisfaction - viz., A. armata, A. dealbata, A. Drummondii, A. grandis, A. hispidissima, A. linearis, A. longifolia, A. pubescens, A. Riceana, A. verticillata, A. spectabilis, and A. vestita. J. G., W.