Family Owned Since 1979
Cultivating Gardeners



Product Description:

104 days. Our choice for a superior storage onion with high yields of uniform crops. Patterson’s yellow bulbs are firm, thin-necked and offer good flavor and excellent storage. The 3 ½-4 inch bulbs have a moderate pungency and good sugar content. They maintain their quality long after other varieties have gone soft. Storage type; stores 10-12 months. Long-day variety.
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  • Key Features:

Customer Reviews

Based on 8 reviews
Germination Issues

I purchased the pelleted seeds and planted an entire tray. Every other onion variety and other plants that I planted that same weekend germinated beautifully and are thriving. I may have had 5 seeds out of the entire batch of pelleted pattersons germinate. Total bummer!

So sorry to hear that! Our products are backed by our full guarantee. We want you, our customers, to be 100% satisfied with the seed, plants and supplies that you purchase from us. If anything you buy from Territorial proves to be unsatisfactory, we will either replace the item (if available) or refund the purchase price, whichever you prefer (for up to 1 year from purchase). Contact our customer service (Monday-Friday 8AM-5PM Pacific Time) at either 800-626-0866 or

Sharon M.
Satisfying onion

These are wonderful, tasty onions! They don't burn your eyes as much as most onions, when chopped. They are good keepers. I store them in my garage in a dark, cool location. My garage is about 45 degrees in winter. They keep until the temperature warms--about 7-8 months. Some of the onions are HUGE! I have I have grown plants for about 5 years, but I haven't tried growing from seeds yet. I plan to try to start them over the winter and transplant them so that I don't have to pay for plants.

My favorite onion to grow!

Onions can be tricky to grow for a lot of gardeners. Sometimes it takes a few seasons to get the hang of growing them, or finding what kind grows best in your area. I used to start with sets, but once I switched to seed and experimented with a few different varieties, this onion has become my number one! I grew nearly 500 last year, and still have plenty hanging in the pantry that I use every night of cooking. Great flavor and great for storage. We don't have the longest season (June 1st to around the end of September/beginning of October), but this variety does very well within my timeframe. I will always grow this onion! -- Zone 8A in the mountains of Northern California.


I've grown Copra onions for years. I usually harvest in August and the onions would store perfectly well into March. Last year I had to grow the Pattersons as Copra was not available. By December the majority were rotted and I ended up throwing out 3/4 of my harvest. So disappointing after all of the work put into growing them.

Sorry to hear Patterson did not store well for you. We found it to be comparable to Copra in our trials. We did add a new variety this year called Cartier (, that we believe surpasses Patterson in its storage abilities, so that'd be a variety worth checking out if you're interested! As always, at Territorial our products are backed by our full guarantee. We want you, our customers, to be 100% satisfied with the seed, plants and supplies that you purchase from us. If anything you buy from Territorial proves to be unsatisfactory, we will either replace the item or refund the purchase price, whichever you prefer. Contact our customer service (Monday-Friday 8AM-5PM Pacific Time) at either 800-626-0866 or

Soil Temp for Germ 50–75°F
Seed Depth ⅛–½"
Seed Spacing 2–4/inch
Days to Emergence 6–16
Thin Plants to 2–7"
Row Spacing 12–24"
Fertilizer Needs Medium
Minimum Germination 75%
Seeds per Gram ≈ 200
Seed Life 1 year

Allium cepa Days to maturity are calculated from date of direct seeding.

• Onions are photoperiodic plants — they regulate their stages of growth by day length
• Onions will make top growth until the critical light duration is reached, then bulbing begins
• The amount of growth and development prior to bulbing will determine the bulb size
• Long-day varieties do well in northern states where summertime day length is between 14-16 hours
• Short-day varieties do well in southern states and bulb when day length is 10-12 hours; they won't get very large in northern states
• Dividing line between short-day and long-day varieties is generally accepted as 36° latitude, roughly along the Kansas/Oklahoma border
• Day-neutral and intermediate-day varieties start bulbing when day length is 12-14 hours; can be successfully grown anywhere
• Onions prefer light, sandy, loamy soils
• Apply 1/4-1/2 cup of TSC's Complete fertilizer per 5 row feet, 1-2 inches below transplant or seed

Direct Sowing
• Thin to the strongest plant when 4-5 inches

• Sow up to 10-12 seeds in a 4-6 inch pot
• If tops reach over 5 inches before transplant, cut to 3 inches
• When planting out carefully separate the seedlings and place in a shallow trench
• Fill trench around seedlings and water in well

Insects & Diseases
• Common insects: Onion thrips and maggots
• Insect control: Pyrethrin or Predatory Nematodes
• Common diseases: Fusarium basal rot, pink root
• Disease prevention: 5-7 year crop rotation

Harvest & Storage
• For scallions: harvest when pencil size or larger, wash and trim roots, store in a bag at 36°F and 95% relative humidity
• As bulbs approach maturity, withhold water so protective paper can form
• After about half the tops have fallen, push over the remainder; wait about 1 week then harvest
• Cure in a warm (75-80°F), shaded, well-ventilated location until outer skin and necks are dry, then trim tops, leaving one inch above the bulb
• Store in a cool, dry, well-ventilated area
• Check occasionally and immediately remove any sprouting or rotting onions

What is pelleted seed?
Seed that has been coated with a clay-based material to form a larger, round shape. This makes planting by hand or mechanical seeder easier and allows for more controlled sowing of small seeds such as carrots or lettuce. All pelleted seed has a National Organic Program (NOP) approved coating.
For best results, store pelleted seed in an air-tight container and use within one season.

What is seed tape?
Seed tapes are perfectly straight rows of precisely spaced crops. No more having to thin seedlings! This biodegradable tape will plant a row 5 meters (16 feet, 5 inches) long. Simply lay it in a furrow and cover with a light layer of sifted compost or soil, water and wait. Save yourself a heap of planting time with these popular vegetable and herb staples.

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