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Germination of

Allium porrum

Violet Leeks: Japanese Negi, Sweet Onion, Welsh Onion

Allium porrum

For Allium porrum (Leek), sow the seeds in a well-draining seed starting mix that has been moistened beforehand. The temperature should be around 60-70�F (15-21�C). Cover the container with clear plastic or a glass lid to maintain high humidity levels and place it under fluorescent lights or in a bright, indirect light location. Keep the soil moist but not waterlogged. The seeds should germinate in about 7-14 days.

Some of plants may have very have specific germination requirements that may not be covered in these general instructions. 

Many seeds require pre-treatment before sowing which we try to list here when we can, but this information may not be present here.  Germination times and germination temperatures are to be a guide only.  Many factors can DRASTICALLY affect this.


It's always a good idea to research the specific germination requirements from multiple sources for each plant before attempting to grow them from seed.

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