A red stemmed bunching (or spring) onion that originates from Japan. Easy to grow and suited to variety of soil types, this is must grow heirloom variety. Rather than harvest the entire onion, cut down for it to regenerate and produce subsequent harvests When to Plant Zone 1: Oct - Apr Zone 2: Sep - May Zone 3: Anytime Zone 4: Anyime For zone map CLICK HERE Soil The soil should be well- drained and not contain excessive nitrogen. The main requirement for onions is potassium, so apply wood ash or potash prior to planting. Soil pH Level 6.5 Position Full sun or partial shade, in a spot that follows leafy green crops such as lettuce or cabbage. How to Plant Sow the seeds directly into the veggie patch.