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Carantan Leek (Heirloom 100 Days)

Heirloom 1874. The 1930 D. M. Ferry catalog names this “Monstrous Carantan”. An old French variety that does require a long growing season. Per Ferry “The largest variety, when grown well, often 3” in diameter. White and tender. It is an exceptionally hardy garden sort.

200 seeds

Please note that germination rates for alliums (onions/shallots/chives/leeks) decline rapidly. We strongly encourage you to purchase new seed each growing season.


Allium porrum

Germination: 5-10 days

Germination Temperature: Optimum soil temperatures 60-75ºF. 

Seed Sowing Depth: 1/4" deep

Sowing Indoors: Start 8-10 weeks before the last frost with soil temperatures 60-75 ºF. Sow in flats 1/4” deep, 1/4” apart. Transplant seedlings out mid/late spring, 4-6” apart. Liquid fertilize seedlings every 7-10 days. Seedlings size should be about a pencil-thick at transplanting time.

Sowing OutdoorsEarly to mid-spring when the soil temperature reaches at least 55-60 ºF. Sow 1-3 seeds per inch, thin to 4-6” apart. 

How much does a packet plant: 25-30 foot single row  

Harvest- Start harvesting baby leeks at 1/2” diameter and leave some for a larger end of season harvest.

Tips-  Needs fertile, well-drained soil. Amend with compost or apply organic granular fertilizer. Adequate water is very important for optimum growth, 1" per week. You can plant leeks in a trench and as the plants mature, fill in around them to assist in blanching.





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  • cocktail onions
  • zone 9a
  • offsets
  • leeks
  • &
  • water
  • seed
  • soil
  • taste
Gail M.
United States United States
I recommend this product

Not planted yet, zone 5b!

It is always great!!!

Richard K.
United States
I recommend this product


They came up strong and are growing well.


great leeks

These leeks need really rich soil to grow to 2 or 3 inches but even if smaller have a great mild taste. Also if you let a few mature for seeds they also produce offsets (look like cocktail onions before they sprout). These will give you large leeks faster than you can get from seed. Have to dig deep to find them or water really well just as it cools in fall and they'll sprout & be easier to find (I'm zone 9a so grow them easily all winter).


Big Beautiful Leeks, then...

I grew these under row cover because we now have Allium moths in Vermont. they were beautiful and hardy and vigorous and I felt like I had cracked the code on how to grow moth free leeks... then... I went on vacation and the row cover blew off in a storm. came back and the leeks looked okay so I put the cover back... one week later I checked them and they were destroyed. You know that feeling... wishing winter would come and "send all the bugs back to **** where they belong". I salvaged part of the white ends and put them in the freezer. Next year... I will do it all over again, but this time... I will check them more frequently and get some better clamps (and maybe I won't go on vacation in the summer!!! )