Customer Service Hours
Mon-Fri 8-4 MST
Features
Family
Fabaceae
Native
Italy
Life Cycle
Annual
Plant Height
Vine
Flower Color
Blue
Bloom Season
Spring to Summer
Further Information
Plant Characteristics
Attracts Pollinators
Growing Conditions
- Drought Tolerant
- Frost Tolerant
- Heat Tolerant
About Mammoth Navy Blue Sweet Pea Seeds
Lathyrus odoratus
1"–2" dark purple-blue flowers
Planting Sweet Pea
Plant Spacing
A group of 3 seeds every 6"
Light Required
Full Sun to Part Shade
Plant Height
Vine
Planting Depth
1"
Planting Details
| Seed Depth | 1" |
|---|---|
| Seed Spacing | A group of 3 seeds every 6" |
| Thinning | When 3" tall, thin to 1 every 6" |
| Germination | 10 – 21 Days |
| Start Indoors | 4 to 6 weeks before your average last frost date. |
| Direct Sow | RECOMMENDED. Cold Climates: 4 to 6 weeks before your average last frost date. Mild Climates: Late fall to early winter for spring blooms. Ideal soil temperature of 55°-65°F. |
Find Your Frost Date & Grow Zone
Average First Frost Date
October 19
Average Last Frost Date
May 19
Your Hardiness Zone is
5b
Send Your Recommendation
Total 5 star reviews: 2 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 2
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Rating
Which best describes you as a gardener?
4 reviews
- andrea e.Verified BuyerRated 1 out of 5 stars5/29/26Summer flower seeds
I bought 2 packets of seeds. Neither product produced any. Waste of money.
Which best describes you as a gardener? IntermediateBIBotanical Interests6/13/26Hey andrea,
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 🌻️
- JoyVerified BuyerRated 5 out of 5 stars2/24/26Beautiful
Already blooming and beautiful!
Mesa, Arizona 9b
Which best describes you as a gardener? IntermediateBIBotanical Interests2/25/26Hey Joy,
That's wonderful! We're absolutely thrilled to hear your Mammoth Navy Blue Sweet Pea Seeds are already blooming and looking beautiful! Those deep navy blue blooms must be absolutely stunning in your Arizona garden. Sweet peas are such a joy to grow, and it sounds like yours are really thriving in zone 9b! Thank you for choosing us and for sharing this lovely update with us. Keep on growing 🌻️
- LuzRated 5 out of 5 stars1/27/265 Stars
The best
- Sandra M.Verified BuyerRated 1 out of 5 stars9/20/25Never flower
I have tried planting these for 2 years now and I never get them to flower. Any suggestions? I plant them as per directions on the packet.
Which best describes you as a gardener? BeginnerBIBotanical Interests9/29/25Hey Sandra,
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 🌻️