Customer Service Hours
Mon-Fri 8-4 MST
Features
Family
Alliaceae
Native
Exists only in cultivation
Life Cycle
Biennial grown as an annual
Further Information
Plant Characteristics
Intermediate Day
About Monastrell Bulb Onion Seeds
Allium cepa (hybrid)
Uniform, 3.5"-4" slightly flattened, round bulbs with dark red rings. "Monastrell"is an intermediate-day onion with a 4- to 6-month storage life.
Planting Onion
Days to Maturity
106-110 days
Plant Spacing
A group of 2 seeds every 4"
Light Required
Full sun
Planting Depth
1/4"
Coverage & Planting Details
| Coverage | This packet sows up to 8 feet. |
|---|---|
| Row Spacing | 12" - 16" |
| Seed Depth | 1/4" |
| 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 Sowing | Unseasonable cold weather (50°F or less) later in the growing season may cause some onions to bolt. |
| 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: 4 Total 4 star reviews: 1 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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Rating
Which best describes you as a gardener?
5 reviews
- Ona H.Verified BuyerRated 5 out of 5 stars5/1/26Great Germination
Still growing for finished crop, but have had great germination with these seeds and seedlings look very healthy.
Which best describes you as a gardener? IntermediateBIBotanical Interests5/6/26Hey Ona,
We're thrilled to hear about the excellent germination rate you got from our Monastrell Bulb Onion Seeds and are looking so healthy and strong! Thanks for sharing your growing success with us! Keep on growing 🌻️
- Kathleen S.Verified BuyerRated 5 out of 5 stars4/17/26So far so good 🤞
Onion seeds have been germinated & transplanted over the last few months, & are now thriving in the garden!
Which best describes you as a gardener? IntermediateBIBotanical Interests4/19/26Hey Kathleen,
We're so thrilled to hear your Monastrell Bulb Onion Seeds have made it through the whole journey from germination to thriving in the garden! 🤞 That's such an exciting milestone and it sounds like you've done an amazing job nurturing them through each stage. Monastrell onions are going to reward you with such wonderful flavor and those beautiful purple-red bulbs are going to be stunning when harvest time comes around. Your patience through the transplanting process is really paying off! Keep on growing 🌻️
- Katie L.Verified ReviewerRated 4 out of 5 stars1/9/26Pretty good start
I had 14 out of 18 cells germinate (and I over started, because I only have room for 14 this year, so it works out perfectly). Pretty happy with that. I will update if I can after the growing season is complete
Which best describes you as a gardener? BeginnerBIBotanical Interests1/13/26Hey Katie,
Thank you so much for taking the time to share your experience with our Monastrell Bulb Onion Seeds! We're absolutely thrilled to hear that you got such great germination with 14 out of 18 cells - that's fantastic! And how perfect that it worked out exactly for the space you have this year! We love hearing about those happy gardening coincidences. We'd love to hear how your growing season goes, so please do update us if you can! Thank you for choosing us and for sharing your growing success with us. Keep on growing 🌻️
- StanleyRated 5 out of 5 stars6/9/255 Stars
I have planted the seeds and trying to patiently wait for the harvesting.
- Mark N.Rated 5 out of 5 stars3/4/255 Stars
I had a 90%+ germination rate. So far so good. Seedlings are developing strongly and I am looking forward to transplanting them outside in a month or so.