July. Height, 2 ft. There is also a dwarf hardy perennial variety (_A.
Echioides_) known as the Prophet's Flower, growing about 1 ft. high,
and flowering early in summer. It needs no special treatment.

Artemisia Annua.--Pretty hardy annuals, the silvery leaves of the
plant being very effective on rock-work. Sow the seed in spring where
it is to flower. Height, 6 ft.

Artemisia Arborea. _See_ "Southernwood."

Artemisia Villarsii.--A hardy perennial whose graceful sprays of
finely-cut silvery foliage are very useful for mixing with cut
flowers. It may be grown from seed on any soil, and the roots bear
dividing; flowers from June to August. Height, 2 ft.

Artichokes.--The Jerusalem variety will flourish in light sandy soil
where few other things will grow. Plant the tubers in March, 6 in.
deep and 12 in. apart in rows 3 ft. asunder, and raise and store them
in November. The Globe variety is increased by off-sets taken in
March. Set them in deeply manured ground in threes, at least 2 ft.
apart and 4 ft. from row to row. Keep them well watered, and the
ground between them loose. They bear best when two or three years old.

Arum Lilies.--In warm districts these beautiful plants may be grown
in damp places out of doors, with a south aspect and a background of
shrubs, though, not being thoroughly hardy, it is safer to grow them
in pots. They may be raised from seed in boxes of leaf-mould and sand,
covering them with glass, and keeping them well watered. As soon as
they can be handled, transplant them into small pots, and pot on as
they increase in size. They may also be increased by the small shoots