Customer Service Hours
Mon-Fri 8-4 MST
Features
Family
Alliaceae
Native
Exists only in cultivation
Life Cycle
Biennial grown as an annual
Plant Height
4" to 5" globe-shaped sweet onions.
Further Information
Plant Resistance
Pink Root Resistant
About Gladstone Onion Seeds
Allium cepa (hybrid)
4"–5" white, globe-shaped, sweet onions. 'Gladstone' is an intermediate-day onion with a moderate storage period.
Planting Onion
Plant Spacing
A group of 2 seeds every 4"
Light Required
Full sun
Plant Height
4" to 5" globe-shaped sweet onions.
Planting Depth
¼"
Planting Details
| Row Spacing | 12" ‒ 18" |
|---|---|
| Seed Depth | ¼" |
| Seed Spacing | A group of 2 seeds every 4" |
| Thinning | When 2" tall, thin to 1 every 4" |
| Germination | 7–15 days |
| Start Indoors | RECOMMENDED. 10 to 12 weeks before your average last frost date. Transplant outdoors 4 to 6 weeks before your average last frost date. The earlier the start, the bigger the bulb. Ideal soil temperature is 60°–85°F. |
| Direct Sow | 4 to 6 weeks before your average last frost date, or as soon as soil can be worked; when soil temperature is at least 45°F. |
| Special Care | Keep growing area weed-free. Onion size can decrease 4% per day if competing with weeds‒that’s 50% in 2 weeks. If bulb pushes itself out of the ground, you may cover it lightly with straw, but not soil, as soil will prevent the onion bulb from forming properly. |
| Growing & Harvesting | When onion tops have fallen over and turned yellow or brown, they are ready for harvest. Harvest in the morning, lifting onions with a garden fork. Dry them in the garden in the sun for 2 to 3 days, lightly covering the bulbs with straw, or the tops of other onions to prevent sunscald. Cure onions for 3 to 7 days in a dry area with good air circulation. Once dry, cut the roots to 1/4", and the greens to 1" to create a seal, preventing decay. |
Find Your Frost Date & Grow Zone
Average First Frost Date
October 19
Average Last Frost Date
May 19
Your Hardiness Zone is
5b
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Total 5 star reviews: 1 Total 4 star reviews: 1 Total 3 star reviews: 0 Total 2 star reviews: 1 Total 1 star reviews: 0
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Rating
Which best describes you as a gardener?
3 reviews
- Katie L.Verified ReviewerRated 2 out of 5 stars1/9/26Germination is so-so
I had about a 50% germination rate on these. I am glad I started them so early, so I can go in and start some new seeds now ahead of the growing season.
Which best describes you as a gardener? BeginnerBIBotanical Interests1/20/26Hey Katie,
Thank you so much for taking the time to share your thoughts in a review. I've reached out to you via email to offer assistance. Your feedback is invaluable to us, and we are committed to ensuring your experience is positive. Thank you once again for your input. Keep on growing 🌻️
- Mary B.Verified BuyerRated 5 out of 5 stars11/2/245 Stars
Love Botanical Interests!
Which best describes you as a gardener? Intermediate - Georgette J.Verified BuyerRated 4 out of 5 stars11/24/234 Stars
Decent Germination so far. Looking forward to seeing the end results.
BIBotanical Interests11/24/23Hey Georgette, We'd love to see photos of the end result too! Thank you so much for sharing and for taking the time to leave feedback! We appreciate you! Keep on growing 🌻️