Natsuguro Bunching Onion is a spring onion that is exceptionally heat-tolerant for plantings throughout the entire spring season. These bunching onions are commonly referred to as scallions and are generally harvested when stems are about 1/4 – 1/2″ in diameter. However, stems will get larger if plants are spaced farther and allowed to grow longer. The heat-resistance of this bunching onion variety allows for much later plantings and harvests into the summer months.
Natsuguro Bunching Onion can be direct-seeded or transplanted. For direct-seeding, plant seeds 1″ apart along the row with a row spacing of 24″. Natsuguro Bunching Onion seeds can be planted with our Hoss Garden Seeder. We recommend using a #1 seed plate and modifying the hole size slightly to accommodate the onion variety being planted. For denser plantings, more holes may need to be drilled to accommodate a thicker spacing.
For transplanting, plant several seeds per cell in our heavy-duty seed starting trays. Once the green stems reach 6-8″ in length and/or they can be easily pulled from the seed trays, the transplants are ready to go in the ground. Transplant each cell 2-4″ apart along the row with a row spacing of 1 foot. If drip irrigation is used, onions may be planted on double rows with drip irrigation in the middle. We suggest burying the drip tape 3-4″ deep and planting on both sides of the tape.
Onions are heavy feeders and will require significant nutrient inputs throughout their lifespan. We recommend feeding them with our 20-20-20 and Ammonium Sulfate fertilizers. Fertilize with 20-20-20 shortly after transplanting. The phosphorous and potassium in the 20-20-20 fertilizer will help to promote solid root development, while the nitrogen will promote vegetative growth. Once transplants are established, we recommend side-dressing or injecting with our Ammonium Sulfate fertilizer. Side dress or inject 1 cup per 20 feet of linear row every 3-4 weeks after transplanting.
Natsuguro Bunching Onion Planting Information
Planting Method: transplant
When to Plant: early spring and fall
Planting Depth: 1/4″
Seed Spacing: 2″
Row Spacing: 24″
Days to Maturity: 65
Disease Resistance: None
– Plant in spring for a mid-summer harvest
– Start bulbing when day length reaches 14-16 hours
– Plant in late winter for an early summer harvest
– Start bulbing when day length reaches 12-14 hours
– Plant in fall if temps are rarely below 20F
– Plant in late winter if temps are frequently below 20F
– Start bulbing when day length reaches 10-12 hours