To encourage pods to set, pinch out tips after the first flowers appear. Sow from late summer to winter, and spring in colder areas. Mature plants are frost hardy.
Keep in mind when planting that Coles Dwarf is thought of as hardy, so this plant will survive close to or on freezing temperatures.By our calculations, you should look at sowing Coles Dwarf about 1 days after your last frost date.