Tokyo Onion Seeds

Tokyo Onion Seeds

San Diego Seed Company

Regular price $1.88 USD
Regular price $3.75 USD Sale price $1.88 USD
Sale Coming Soon
Shipping calculated at checkout.

Product Details

Product Information

We trialed these Tokyo onions on our farm during the fall/winter of 2018 and were wonderfully surprised! They grew quickly to a stunning size of 2″-3″ (5.4-7.6cm) in diameter. Great mild flavor. The bunching onion is one of the most important types of onions in Asia and has been grown in China for thousands of years. A versatile and mild flavor makes it a great accompaniment to any dish. You can grow them in a pot or on a balcony. They do really well when interplanted with other cool-season crops like cabbages or broccoli. We keep ours in the ground until we use the last of them in mid-summer after our salsa season!

Tokyo onions are grown as green onions or shallots.

Product Details

Approx Seed Count


Seed Weight

1G, .04oz

Botanical Name

Solanum lycopersicum

Planting Season 


Soil Temp

50° F+, 10°C+

Planting Depth

¼”, .6cm

Area to Sow

100' row, 30.5m row

Days to Germ.


Days to Maturity


Best Planting Method

Direct or transplant

Thin to

≥1" apart, 2.5cm apart

Final Spacing

≥3" apart, 7.6cm apart



Plant Spread

24-36", 61-91.4cm

Plant Height

36-60", 91.4cm-1.5m


Planting by Zones

Zones 9-10

  • Onions are a cool season crop in Zones 9 and 10. Plant them in the fall through late spring.

Zones 2-8

  • Start seeds 5-8 weeks before the last frost and plant out when the threat of frost is gone.

Planting Tokyo Onion Seeds

  • In Zones 9 and 10, direct sow or transplant out your onion seeds.
  • To direct sow, plant seeds in well-worked soil that has been deeply watered and is debris-free. Cover with 1/4″ (.6cm) of finely sifted soil.
  • If you are planting seeds in starter pots, plant seeds into thoroughly moist high-quality seed starting soil. Place seeds on the top of the soil and cover with 1/4″ (.6cm) of finely sifted soil.
  • Once your seeds have germinated and are 1-2″ (2.5-5.5cm) tall, fertilize with an organic liquid fertilizer. When the plants are 3-4″ (7.6-10.1cm) tall you can plant them out into the garden.
  • Green onions should be spaced at least 3″ (7.6cm) apart.
  • Bulbing onions should be spaced at least 5″ (12.7cm) apart.

Choosing Onion Varieties

The most common mistake gardeners make with growing onions is they can’t get their onions to bulb. The most common reason why is that they planted a variety that is not appropriate for their region. Bulbing onions are daylight sensitive and you must grow the right kind in your area for success. Here are the 3 kinds of onions.

Short Day Onions: 10-12 hours of sunlight are required to form bulbs.

Intermediate Day Onions: 12-14 hours of sunlight are required to form bulbs.

Long Day Onions: 14-16 hours of sunlight are required to form bulbs.

Those south of San Francisco should grow short-day onions.

There are lots of different varieties of onion available in seed. We specialize in short-day onions for southern growers. Gold Coin onion is a tasty cipollini-style onion that does really well in Southern California. Red Burgundy is a classic red onion for southern states. Red Rock is a high-quality specialty red onion that does exceptionally well in southern states. For those in the north, we have tons of green onions and shallot-style onions that can be grown during any frost-free time of the year. Torpedo onion creates beautiful red shallots that are mild and tasty. They can be planted in spring for an early summer harvest. Then, of course, there are standard favorite varieties of onions like Toyko and Evergreen bunching onions.

Growing Toyko Onions

  • Onions are easy to grow! They should be planted in an area of the garden that is out of the way. Particularly if you are growing bulbing onions which can take more than 165 days to mature.
  • Mulching heavily around your plants will help with weed suppression and moisture retention.
  • More tips on growing onions from seed in our guide.

Harvesting Onions

  • Green onions can be harvested at any stage that they look appealing. Simply pull them out of the ground.
  • For bulbing onions, take care not to harvest too early. Wait until fall when the tops brown and fall over, that will be a signal of being ready for harvest.

Growing Onion in Containers

  • Onions are a great plant for a container. Make sure your container is at least 10″ (25.4cm) deep for green onions and 20″ (50.8cm) deep for bulbing onions. Keep in mind containers will dry out faster because they have more surface area and less soil to hold onto moisture. Mulch heavily on the top layer of soil in the pot to keep the soil from drying out or heating up too much.

Southern California Pro Tips

  • Mulch heavily around your plants to ensure the soil does not dry out or heat.

Companion Flowers/Crops

  • Bulbing onions in particular are a long-term crop and should be planted in an area where other crops can be planted between or with them. We like growing our onions next to quick-growing crops like radisheslettuces, and beets. We harvest those crops 3-4 times before the onions are ready.
  • More information about onion companion plants is on our blog!

Additional Learning Resources

View full details