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- bonariensis. Flowers from July to September. Tall heads of bright, eye
catching,lavendar- blue flowers, much loved by bees. Hardy. Prefers full sun, in ordinary soil.
4-6ft
- grandis. Flowers from July to September. From Japan, produces lengthening spires (up to a foot long) of small deep blue flowers until late September. Fully Hardy. Prefers full sun, in ordinary moist but well drained soil.
2-3ft