Apium

Six species. See Celery, Celeriac, and Parsley.

Aponogeton

Four species. Stove or green-house aquatics. Offsets or seeds. Loam and peat in water.

Apple-Bark Beetle

Bostri-chus.

April

In this fickle month the sheltering of wall fruit requires particular attention. Easterly blighting winds always prevail towards its close, and early in May.

The work required to be attended to in the various departments in the latitude of Philadelphia, is as follows. It should be performed early or later as we reside south or north of that latitude: -

Green-House

Air, admit daily, as weather permits. - Camellias, sow and graft. - Earth in pots stir frequently; and add fresh if not done in March. - Greenfly or Aphis usually indicates the house has been kept too cold. - Hardiest Plants keep in coldest parts of house, near the ventilators. - Head-down irregular growing shrubs, - Heat, increase if necessary. - Inarch shrubby exotics. - Leaves and Wood decayed, remove as they appear; clean with sponge or syringe. - Liquid Manure apply to sickly shrubs. - Potted Plants, shift as they require room; and water immediately. - Propagate by seeds, cuttings, inarching, and other modes, as the species permit. - Prune or Pinch off free growing shoots, to make shrubby growths. - Succulent plants shift; plant cuttings and suckers. - Water often, guided always by the plant's habits.

Aqueduct

Aqueduct, a conveyance of any kind for conducting water. The Romans made prodigious structures of this kind; some are still in use, others, in a state of decay, are among the greatest ornaments of Italy. In landscape gardening, the aqueduct enables the operator to produce a fine effect, where the absence of water would render the scene tame and uninteresting.

Aquilaria

Aquilaria malaccensis. Stove evergreen shrub. Cuttings. Loam and peat.

Aquilegia

AquilegiaColumbine. Seventeen species, and many varieties. Hardy herbaceous. Seed. Common soil.

Arabis

Thirty-one species, and some varieties. Hardy herbaceous and evergreen. Seeds or cuttings. Light soil.

Arachis

Arachis hypogaea. Stove annual. Seed. Sandy loam.

Aralia

Eighteen species. Chiefly stove evergreens, but a few hardy or green-house plants. Cuttings. Common soil.

Araucaria

Three species. Coniferous green-house trees. Rich light soil. Cuttings planted in sand in August take freely. Cover with a bell-glass, and place in a cold frame or pit. Exclude frost and damp. In spring give a little bottom heat. Plants thus raised never form good leading shoots. - Gurd. Chron.

Arbour

Arbour is a seat shaded by trees. Sometimes these are trained over a wooden or iron trellis-work, mingled with the everlasting sweet pea, clematis, and other climbing odorous plants. When the trellis-work is complicated and the structure more elaborate, with a preponderance of the climbers already named, together with the honeysuckle, etc, they are described as French or Italian arbours.