Monty Don explains how he grows two different plants with white umbel-shaped flowers. First, in May, the flowers of cow parsley, Anthriscus sylvestris create a carpet of white. While those are still in flower, Monty plants plugs of Ammi visnaga, grown from seed in February, which will continue the show into the summer. Watch now, to find out how to create your own long-lasting display of white umbellifers.

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