semi-perennial dies away in winter. The size after 10 years is 300 cm. The flower colour is blue. The flowering period is June – August. This plant is hardy. Recommended quantity per square meter : 1. . This plant has received the following award: Award of Merit by the Royal Society for Boskoop Cultures 1990. Is present in the plant shop. Please check actual availability in the current stocklist. This plant has received the following award: Award of Merit by the Royal Society for Boskoop Cultures 1990.
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