The only species of Acidanthera which has been introduced hardy enough to be classed with half-hardy bulbs is A. bicolor, a pretty plant with spikes of whitish flowers with the lower segments spotted purple. It may be grown outside in a warm border if treated like a half-hardy Gladiolus, or better, under glass as recommended for the Ixia.
Albucas
Only a few of the Albucas, which come near to the Ornithogalums, deserve cultivation; these can be grown outside in warm districts alone, on a raised bed of rather light soil, in a sunny position, protected in winter by a layer of litter. They are, however, better in the greenhouse or frame. Aurea, yellow; fastigiata, white; and Nelsoni, white, are the best in cultivation. They bloom in summer, and may be planted three inches deep in autumn.
Alstrœmerias
Apart from the hardier Alstrœmerias, which may also advantageously be grown in frames or in cold greenhouses, there are several others which are pleasing occupants of frames and cool greenhouses, from which severe frosts are excluded. The least hardy of all is A. caryophyllæa, which should always have a little heat, and does best in a warm greenhouse or stove. Eminently suitable for the frame or the greenhouse without heat are the charming pelegrina, white or yellow, striped with rose, and with a yellow spot on its segments; and its white variety, alba, a lovely thing. Then there are Errembaultii, a pretty hybrid, white, spotted purple; pulchra, purple, white, and yellow, with red spots, and brasiliensis, with its reddish yellow flowers spotted with brown. At one time these were more grown, and a renewed demand would bring many other species into cultivation. A light rich soil is suitable for all, with plenty of water while growing but very little afterwards.
Androstephiums
These are pretty bulbous plants resembling the Brodiæas, and hardy if planted six or seven inches deep, but better grown in a frame. They like a sunny position and a light soil. The species are breviflorum and violaceum.
Besseras
Few people know the Bessera, which is a pretty little bulbous plant from Mexico, bearing some resemblance to the Scillas, but having bright scarlet or scarlet and white flowers. It grows from one and a half to two feet high, and may be treated similarly to the Babianas. It is one of the many half-hardy bulbs which might be more widely cultivated with advantage.
Boussingaultias