Soil
Any reasonably fertile, well drained soil that holds moisture well.
Position
Full sun.
Frost tolerant
Yes. Plants die back to the roots in winter.
Feeding
Not usually required.
Companions
Beans, Cucumber and Rhubarb.
Spacing
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.
Notes
Can be invasive, so use flowers indoors as cut flowers to reduce reseeding.
Harvesting
Harvest tubers in fall, winter, and early spring, while the soil is cold.
Troubleshooting
Powdery mildew often affects plants in late summer, but does not impact yields.
