The very definition of "easy to grow" - these these beauties grow from rhizomes that send up 4-6 foot tall stems with tendrils that will cling to small twigs or decorative trellis. They flower all summer and into the early fall - and they can be planted as soon temperatures turn mild and there is no danger of frost.
I grow mine in pots. When the plants are finished blooming and turn yellow in the fall, I cut the stems off and carefully remove the rhizomes - which have often doubled in size - then pack in a box with slightly damp coir I buy from Gardener's Supply. The box goes into the chilly room where I over-winter my potted lemon trees and rosemary.
The ones featured here grew into from very large, healthy rhizomes I ordered from Easy to Grow Bulbs (who also provide excellent growing info on their website). Smaller rhizomes (like those sold at box stores) will grow just 2-3 feet tall their first year.