Any reasonably fertile, well drained soil that holds moisture well.
Yes. Plants die back to the roots in winter.
Not usually required.
Beans, Cucumber and Rhubarb.
Single Plants: 1′ 11″ (60cm) each way (minimum)
Rows: 1′ 11″ (60cm) with 1′ 11″ (60cm) row gap (minimum)
Sow and Plant
Set out tubers in spring, planting them 4 inches deep. Plants grow quite tall, and can be used to shade heat-sensitive neighbors.
Can be invasive, so use flowers indoors as cut flowers to reduce reseeding.
Harvest tubers in fall, winter, and early spring, while the soil is cold.
Powdery mildew often affects plants in late summer, but does not impact yields.