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Veronicastrum virginicum LavendelturmTall herbaceous perennial. Long, narrow spires of tiny, pale lavender-blue flowers. Good at back of border. | Flowering period: July and August. | | Growing conditions: Moist, well-drained position. Most soil types. | | Typical mature height: 72 inches ( 183 cms ) | | Hardiness: Hardy. Should withstand average to cold UK winters. |  | This plant has been awarded the Royal Horticultural Society's Award of Garden Merit (AGM). | |
 
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