Climber 180cm (6ft).
Sow February to April. Sow seeds into pots or trays of moist seed compost and cover with a sprinkling of compost or vermiculite. Place in a propagator or warm place, and keep at a temperature of around 20-30C (68-86F). After sowing, do not exclude light as this helps germination. Keep the surface of the compost moist but not waterlogged; germination will usually take 30-40 days.
In the autumn , gradually dry off tubers and store loose , in a cool, dry and frost free place over the winter. Re-pot in early spring into 13cm (5in) pots and grow on as before, re-potting further as necessary. Grow on in a greenhouse or conservatory.
Water freely during the growing season . Tubers can take 2-3 years to flower.
Tubers are highly poisonous.