Mar, Apr, May
Place the tubers in a large, deep pot and fill with compost so the shoot tips lie a few centimetres below the surface. Each tuber produces a single shoot, so plant several in each pot.
Stand the pot in a warm spot, such as in a heated greenhouse or on a heated propagator, and keep the compost moist.
When upright, leafy shoots form, tie them to supports. The leaf tips have hooked ends that will attach to things, but don't rely on these as the only means of support. The shoots will branch out and produce spectacular flowers in midsummer.