To be filed under clever design ideas: a galvanized-wire topiary frame with hinged panels to make it easy to train a shrub to grow into a cone shape:

Above: Manufactured by UK-based Burgon & Ball, a Topiary Cone is $55 AU at The Potting Shed.

Above: Consider it training wheels for a topiary. “This classic ‘Cone’ topiary shape, formed from galvanized wire, is hinged to enable it to be fitted around established plants and/or removed after trimming is completed,” notes retailer The Potting Shed.

Above: The topiary frame measures 60 centimeters high (about 23.5 inches) and has a 30-centimeter diameter (about 12 inches) at the base.
See more tips for care and pruning at Boxwood: A Field Guide to Planting, Care & Design and some of our favorite evergreen alternatives to box in our curated design guide to Shrubs 101, including Yew, Rosemary, and Privet. Read more: