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Onion Sets Senshyu - Autumn Planted Japanese Type

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Pack of 250g Autumn Planted Onion Sets.

Senshyu is probably the most popular of the 'Japanese' over winter varieties. It has a semi-flat shape with yellow/brown skin. Senshyu matures late June onwards.

Onion Sets Senshyu - Autumn Planted Japanese Type Grow Notes
When to Plant Sets: Autumn
Germination Temperature: 12 ℃ Cover Sets: Yes - Tips showing
Time to Shoot: Depends Frost Hardy: Yes, Can be protected over Winter.
Spacing Between Plants: 15cm Row Spacing: 30cm
Plant Height: 50cm Planting Position: Sun

 

Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Sow In Trays:                        
Sow Direct:                        
Harvest:                        

How to Successfully Grow Autumn Planted Onion Sets

Onion sets are small immature onions, which have been grown from seed in the previous year, and then harvested early so that they can be planted out a later date. It’s because the onion is such a versatile vegetable that demand is an all year round affair. In that respect we need a constant supply of onions for all our culinary needs, and therefore it should come as no surprise that we have a vast range of varieties and cultivars to choose from.

However, there is generally less choice of options with onions that are grown mainly from sets over those grown from seed. The main advantage of growing onions from sets is their readiness to plant at short notice without all the fuss of growing from seed. Autumn planted sets will provide the grower with a distinct advantage of an early harvest in the following year.

Growing in containers

Onions can be grown in beds or containers. Growing onions from sets in containers is ideal for those who want a small, steady supply of bulbs as and when needed, with any surplus being dried and stored for later use. Between September and November fill large pots or containers with good quality compost containing plenty of organic matter. Firm the soil surface and apply water with a watering can and rose attachment. Use a dibber or gently push the sets into the soil, at 10cm spacing, so that only the tips are visible. Place the container in a sunny position.

Growing in beds

Prepare planting beds, usually after other main crop vegetables have been harvested, and incorporate plenty of organic matter. Onions will grow best in well-drained soil in a sunny position. Rake the surface soil to a fine tilth and firm with the back of a rake. If you like your onions to be grown in straight lines then use a string line for marking out. Ensure the soil surface is damp and then draw a furrow with the edge of a hoe or push the sets into the soil so only the tips are showing. Space each set at 10cm apart in the rows and 30cm between the rows.

General aftercare

If the autumn is mild then the sets will begin to show signs of growth with green shoots appearing. Onions are very hardy but if early hard frosts are forecast then ensure these young shoots are protected by applying a mulch of leaf mould or straw. Water sparingly and only if the soil dries out, otherwise they should over winter without any problems. Water as normal when temperatures rise during late spring.

Pests and diseases

Over winter, the onions will be dormant and pests and diseases will be less troublesome. Come the spring, look out for signs of yellowing leaves, rust, mildew and mould. Whilst most onion sets purchased from reputable suppliers will be fine, weather conditions may cause several fungal-type problems, for which there are no chemical remedies. Avoid feeding young plants with nitrogen-rich fertilisers. Onion fly is a known pest but rarely affects plants grown from sets.

Harvesting and storage

Autumn planted onion sets should be ready for harvesting from early June in the following year, which is 2-3 months ahead of spring planted sets. Store in a cool dry place.

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Customer Reviews
Onion Sets Senshyu - Autumn Planted Japanese Type
Write a Review and share your opinions!
4 Reviews:

Senshu Onion Sets overwintered.
Rating:
23 June 2019  |  Kevin

These onions are so reliable and have grown into large good quality onions, I will be ordering again this year from SimplySeed.


Senshyu onion sets
Rating:
03 October 2014  |  Carol

Have grown these for a few years with great success They give u onions a lot earlier and can be used while later onions are just starting to grow I have onions all year round as I freeze some as well as they freeze well


No problem to grow
Rating:
02 September 2013  |  Michael

Tried these by planting Autumn last year. Grew well even in the harsh weather at the beginning of the year. Looked a bit battered after that but recovered really well with a good heavy crop.


Senshyu onions
Rating:
12 September 2012  |  Stephen

This onion is so easy to grow. withstands hard winters and ready for cropping by May. Lovely as a giant spring onion or later in the year as a normal onion. Larger than Spanish and do not bolt or suffer neck rot.