OP, Heirloom Can be used to grow either fresh spring onions or left to full maturity for keeping onion bulbs. Dutch onions are resistant to bolting and keep for very long. Produces onions that can store all winter. A long day type that will produce flattish onions with yellow skins-as a long Day variety these need between 14 – 16 hours of Daylight to produce bulbs.
Sow the seeds thinly on the surface of a good quality moistened seed compost at Approx 18 – 20 deg °C in Feb – March. Lightly cover the seed with fine compost or just cover the seed. Once large enough to handle the young plants can be transplanted into either 3″ pots or tray cells. When all risk of frost has passed plant out in final growing positions allowing appx 6 inches between plants.
Standard salad crop for bunching; relatively low maintenance, and some varieties are also suitable for overwintering for early lifting. Suitable for fresh market and pre-pack use.
240-360 seeds per gram. Germinates 5-30°C. Sow March-April for a Spring crop, overwintering type July-August, pickling type mid-February-March. Seed rate 15-20kg per hectare, at a population of 65-70 per meter row length.
Bulbing onions: A popular crop – long storage lives make for good continuity of supply. Also popular for plant sales and competition growing. Germinates between 5 and 30°C, sowing date mid-February-March. Requires fertile soil in a well-drained location in the garden. Shallots are very close to garlic and are very easy to grow. Plants can grow 8 to 12″ tall.
Requires fertile soil in a well-drained location in the garden. Keep seedlings and transplants consistently moist, but not waterlogged. Keep free from weeds.