• Potato Onion SEEDS - Multiplier Onions - Allium cepa var. aggregatum - Andy's Green Mountain Multiplier
  • Potato Onion SEEDS - Multiplier Onions - Allium cepa var. aggregatum - Andy's Green Mountain Multiplier
  • Potato Onion SEEDS - Multiplier Onions - Allium cepa var. aggregatum - Andy's Green Mountain Multiplier
  • Potato Onion SEEDS - Multiplier Onions - Allium cepa var. aggregatum - Andy's Green Mountain Multiplier
  • Potato Onion SEEDS - Multiplier Onions - Allium cepa var. aggregatum - Andy's Green Mountain Multiplier
  • Potato Onion SEEDS - Multiplier Onions - Allium cepa var. aggregatum - Andy's Green Mountain Multiplier
  • Potato Onion SEEDS - Multiplier Onions - Allium cepa var. aggregatum - Andy's Green Mountain Multiplier
  • Potato Onion SEEDS - Multiplier Onions - Allium cepa var. aggregatum - Andy's Green Mountain Multiplier
  • Potato Onion SEEDS - Multiplier Onions - Allium cepa var. aggregatum - Andy's Green Mountain Multiplier
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Potato Onion Seeds

Potato Onion Seeds - Allium cepa var. aggregatum - Andy's Green Mountain Multiplier Mix

Allium cepa var. aggregatum
Andy's Green Mountain Multiplier Mix
  • Hardy to Zone 4
  • Full Sun
  • Germination Tested October 21, 2025: 95%
  • Approximately 70 seeds per packet
$6.95 CAD
$6.95 CAD
Sale Sold out

Expected to restock in December 2026.

Potato onions are a perennial multiplying onion, slightly smaller than regular onions, but their advantages are they are easier to grow and they keep for much longer in storage, up to a year in my experience. Potato onions used to be popular in North American gardens, but fell out of favour eventually, possibly because they could not be mechanically harvested.

Plant these seeds once, then keep some of the onions for replanting next year. In their first year, these seeds will grow into a single onion. Harvest them once the tops die back around August. Store them inside over winter. Eat the biggest onions, and replant the smallest ones in spring. Generally, if you plant larger onions, they will multiply into many smaller onions. If you plant smaller onions, they will multiply into larger, fewer onions.

If you want to produce seeds, leave the onions in the ground overwinter, and they are more likely to flower. Many potato onion varieties only flower very rarely (if you can find them for sale at all!), so can only be propagated by replanting the onions. This variety is nice because many of them flower readily, which enables you to quickly establish a large patch of onions. 

If you don’t want flowers and seeds, cut off the flower stalks (scapes) and eat them like green onions. Cutting of the flowers allows the plants to put more energy into the bulbs  

This seed mix is a base of the Andy's Green Mountain Multiplier "variety", which is a cross between Green Mountain Multiplier (bred by Kelly Winterton of Utah) and a Yellow Potato Onion (cross made by Andy Hahn in Colorado). The resulting seeds are diverse- a range of colours, sizes (some as large as a grocery store onion in their first year!), and traits. Last year I also allowed some beautiful red Lorient bulbs to flower (this variety is a hybrid), as well as a local yellow variety I've been calling Errington Heirloom. The resulting mix has even more colour and diversity than before! Each seed in this mix could result in a new potato onion variety. 

We need more backyard breeders developing vegetable varieties that are regionally-adapted. There's been a huge loss of diversity in heirloom potato onion varieties over the years. Let's bring it back!! Simply save onions from your favourite plants for planting again next year, multiply it over the years- and you've got your own variety.

Some traits I am focussing on in different breeding lines include larger and more numerous onions per plant, long storage, winter hardiness, and seldom-flowering.

Hardy to zone 4 if you want to leave the bulbs in the ground over winter to perennialize. They can probably be grown in colder zones if you make sure to bring all the bulbs inside for winter, which most growers do anyway.

Growing Instructions

Sow seeds shallowly indoors in January or February. I like to sow my onions in deep trays so they have enough soil to grow for a few months. I use a heat mat to get them going, but remove them from the heat as soon as they emerge. Plant outside once they are a few inches tall and harsh frosts have passed. Plant about 8-12 inches apart. Harvest bulbs when their tops have flopped over and turned brown (usually around August). You can reduce watering at this time as well. Bring them inside and store in a well-ventilated dark place until you eat them or replant in the spring. Or just leave some in the ground to see if they will perennialize in your area (they will probably do better if you divide and space them out every couple years).

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Most orders are sent via Canada Post to keep costs low.

 

Shipping within Canada 

We ship seeds in Canada via Canada Post's regular letter mail, which is an untracked service, and usually takes 1-4 weeks to arrive once we fulfill your order, but occasionally letter mail takes up to 6 weeks, especially to the Eastern provinces and rural areas.

Customers can now opt for tracked, express shipping options at checkout if you require faster delivery and/or tracking.

Larger bulbs and plants are usually sent via tracked flat rate box.

 

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International shipping countries include: Hong Kong SAR, Ireland, Japan, Malaysia, Netherlands, Norway, Singapore, Spain, Sweden, Switzerland, United Arab Emirates, United Kingdom. (List updated Aug 31, 2026)

This list may change without notice. Sometimes Canada Post will not allow us to ship to certain countries due to wars or natural disasters, see this page for delivery service alerts.

 

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Ecologically Grown

Seeds are grown ecologically without the use of chemical pesticides or fertilizers.

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