Long Island Brussels Sprouts Seeds

Introduced in the late 1800s, Long Island Improved was one of the most important commercial varieties. The semi-dwarf compact plants grow up to  24 inches tall, that produce massive amounts of tight, tender heads about 3-5 cm in diameter. Long Island Improved Brussels sprouts are a great crop to grow during the colder months of the year.

- Latin Name: Brassica oleracea var. gemmifera
- Days to Maturity: 90-110
- Life Cycle: Biennal, usually grown as an annual
- Canada Hardiness Zone: Annual 2-9 / Biennal 4-9
- Start Indoors or Cold Frame: 2-4 weeks before final spring frost
- Seeds Per 5 cm Cell: 2 or 3-4 seeds every 5 cm in row flats
- Planting Depth: 1 cm
- Days to Germination: 3-14
- Germination Optimal Soil Temperature: 25-30°C
- Seedlings Optminal Daytime Temperature: 15°C
- Days from transplanting to mature crop: 70-90
- Transplant Seedlings: 45-60 cm apart
- Direct Sowing: 4 months before expected fall frost
- Seed Spacing: 3-4 seeds every 45 cm
- Thinning Seedlings: Progressively until 45-60 cm apart
- Row Spacing: 60-90 cm
- Plant Height: 80-100 cm
- Harvest: After first fall frost until the end of December. Sweeter flavour when harvested after frost. 
- Average Seeds Needed Per 10 m Row: 100
- Average Yield Per 10 m Row: 20 lb.


A delicious, vintage vegetable to grow, brussels sprouts thrive in the cool of the spring and fall. Enough space and a long growing season is required, but a fresh bounty of brussels sprouts is worth the time and effort.

Start seeds indoors in winter or early spring to beat the heat of summer. For a fall harvest sow the seeds directly into the garden 6-10 weeks before the first frost. To start seeds, plant 1 cm deep in flats with pre-moistened starter mix. Keep seeds moist, warm and, after germination in 7-10 days, use lights to prevent seedlings from getting leggy.

Harden off the seedlings before transplanting outdoors, which should be after the danger of the last frost has passed. A couple weeks before transplanting outside, spread a layer of compost or mulch over the bed to warm up the soil. Transplant when the young plants are 10-15 cm tall and space them 45 to 60 cm apart. The gnarly stalks will need space to grow tall and bud out successfully.

Brussels sprouts do best under full sun in fertile, well-drained soil. Make sure the plants get 3-6 cm of water/week, a little more during dry spells. A good amount of mulch around the base of the plants will greatly benefit the shallow roots, keeping them cool and moist. Brussels sprouts, like other brassicas, are heavy feeders and should be fertilized once a month. This is especially important during their flowering phase.

Harvest the sprouts from the bottom of the stalk up. When the heads are firm, dense and still tightly closed, at about 3 cm in diameter, harvest by hand, with a knife or pruners. Be careful not to damage the main stalk. For uniform maturity and size, plants can be pinched when lower sprouts are 1-2 cm in diameter.


- Forerunners to modern Brussels sprouts were originally native to the Mediterranean region and later appeared in northern Europe around the fifth century. Brussels sprouts as they are now known were cultivated in the 13th century near Brussels in Belgium.

- Being very tolerant to frost, Brussels sprouts are a good vegetable to grow in colder climates.

- Brussels sprouts seeds will remain viable for 4 years if stored in a cool, dark place, ideally between 4 and 10⁰C. After that, the germination rate may start to go down.


You know that a lush, fruitful garden needs good soil, frequent watering, and sunlight to grow, but it’s the seeds that really make the harvest.

Picked and bagged for 2023 the vast majority of our seeds have germination rates of over 85%. The seeds are all-natural, non-GMO, non-hybrid, untreated, and open-pollinated for seed saving.

We have put a lot of thoughts into the design and packaging of our seed packets. Our seeds are all carefully packed in food grade kraft paper/aluminium zipper lock bags, and then are shipped in eco-friendly padded mailers.

We heat-seal each of our seed packet for even more protection from moisture, odour and light, allowing you to store your seeds for up to 3x longer than paper or plastic. Plant them all, germinate some indoors, save some for next season - it’s up to you!

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Fatima C.
Canada Canada

Nice packaging. Can be resealed as well

Nice packaging. Can be resealed as well