Multi-stemmed trees appeal and delight. Featuring in many show gardens this year, they bring a fresh look to garden trees, so they can become a major focal point in any garden, including a small one.

But Robert's favourite is Betula utilis var.jacquemontii 'Doorenbos', a stunning Himalayan birch with gleaming white stems. 'It makes an excellent multi-stemmed tree and has fine peeling white bark ...