Verbena bonariensis

Verbena bonariensis, the Argentinian vervain, is a tall, branching perennial, with erect, branching square stems up to two metres tall. It bears many small clusters of purple flowers from the mid-summer to late autumn and likes a sunny aspect, with well-drained soil. It can be hardy in a sheltered spot and has a habit of self-seeding; you should cut the main stem down in late winter. It is particularly effective grown through a rose bed, or combined with Stipa gigantea or golden oats – you can see the pairing at the Keble gate leading into the University Parks from Parks Road.

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