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Pretty hardy perennials suitable for the border. Produce drooping pale blue flowers on branching spikes in July. Any soil suits them. They may be grown from seed, but will not allow being divided at the root. Height, 1 ft.
This showy plant, bearing large blue flowers in June, may be increased by division of the roots into as many plants as there are heads, from slips, or from seed sown in the open border in spring. It is popularly known as Ox-Tongue.
This hardy herbaceous plant bears light blue flowers in July. A rich, moist soil is its delight. It is propagated by dividing the roots. Height, 1 ft.
A handsome, hardy, bulbous plant, bearing clusters of beautiful blue flowers in July. It needs a sandy peat border under a north wall, and is increased by bulbs or seeds. Plant the bulbs early in October, 4 in. deep and 5 in. apart. Height, 1-1/3 ft.
This ornamental hardy perennial makes a good border plant, growing in any loamy soil, and producing its blue flowers in June and July. It can be multiplied by dividing the root. Height, 3 ft.
A pretty greenhouse climber, bearing cobalt-blue flowers. It should occupy a sunny position, and be watered freely from March to September, after which very little should be given.
A hardy border plant with long spiny foliage, and bearing from July to September large light blue flowers. It requires a light, rich soil. Young cuttings may be struck in sand. Height, 1 ft.
This is a hardy herbaceous plant producing blue flowers in July. It will grow in any soil and needs no special treatment. Seeds may be sown either in autumn or spring. Height, 2 ft.
Ornamental plants, mostly bearing lilac or blue flowers. Many of the half-hardy kinds are grown in pots, so that they may the more readily be removed to the greenhouse in winter. The perennials are propagated by dividing the roots. The annuals are increased from seed sown in March or early in April. They like a [...]
This handsome, hardy bog-plant produces deep violet-blue flowers in August and September. It may be grown in any damp soil and increased by division. Height, 1-1/2 ft.
