Scallions (Spring Onions) – Ishikura Bunching
An outstanding variety, perfect for bunching. Leaves are upright and dark green with straight long white stem. Perfect.
Sow small amounts every 2 weeks from late March until July. Sow 8-10 seeds per cell in modular trays and plant out 4 to 5 weeks as bunch.
Between rows: 25cm
Between plants in the row: 25cm
Approx. seed count: 200
Scallion (Spring onion)
Latin name: Allium cepa
Family: Alliaceae (commonly known as Alliums)
With the help of a polytunnel or greenhouse you can harvest scallions for nearly twelve months of the year. In order to achieve this you need to get into a routine and sow small quantities at regular intervals.
Scallions are grown for their small, white shanks and tender, green stem and leaves. They are also very easy and quick to grow.
Soil and site
Scallions prefer a pH of 6.5 to 7 and grow in any reasonably fertile soil.
In order to get regular crops of freshly harvested scallions you need to sow them at regular intervals every second week starting from late January (on a heating bench) until early September.
I usually sow the seeds into modular trays, ten seeds per cell and about 1.5cm deep. The trays are placed on a heated bench or a warm, south-facing windowsill. About four weeks after sowing each module is planted out together as a bunch (without separating the seedlings). If they are planted like this they are a lot easier maintained and also harvested.
I plant bunches of ten seedlings together at a spacing of 25 x 25cm.
Regular watering is absolutely essential as scallions prefer to grow in moist soil. If the soil is too dry they may develop a bulbous growth.
Scallions are ready about four to six weeks after planting out. Harvesting is very easy if they are already growing in bunches. Simply pull or fork out the bunches, knock off some excess soil from the roots, cut off the tops so the bunches are about 30cm long and tie them together with a rubber band. Only harvest scallions as you need them as they will not keep well once they are harvested.
Scallions may suffer from the same pests and diseases as onions but to a much lesser extent because they mature so much faster.
Downy mildew is the only problem I have encountered with scallions and only if I left the plants too long in the ground.
How much to grow?
You will get 16 bunches of scallions per square metre.
By far the two best varieties of scallions are:
Parade (a high quality variety, very reliable and easy to grow, excellent flavour)
Ishikura Bunching (a very vigorous growing single stalk variety, excellent for growing in tunnels and greenhouses all year round)