Very long, narrow spires of pale purple blue flowers above whorls of narrow, dark green, serrated leaves. Great for adding height and colour in late summer. To 1.5m. Hardy.
Very large flowered cultivar
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Veronicastrum virginicum 'Apollo' (Culver's Root 'Apollo'): Very long, narrow spires of pale purple blue flowers above whorls of narrow, dark green, serrated leaves. To 1.5m. Hardy.