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Agapanthus 'Blue Umbrella' is a sturdy evergreen plant which needs a sunny site and to be be sheltered and well drained in winter. Provide these conditions and you'll get a large clump forming spectacular flower fest, with sturdy stems up to 1m high with large spherical heads of small vividly coloured cobalt blue flowers. The leaves are glossy and straplike and the whole effect is extremely attractive. Great for patio planters as well as general use in herbaceous or mixed borders. Can spread to 60cm in the right conditions, but in colder northern gardens specimen plants may be tender without protection.