Customer Service Hours
Mon-Fri 8-4 MST
Features
Family
Fabaceae
Native
Italy
Life Cycle
Annual
Plant Height
Vine
Flower Color
Mixed
Bloom Season
Spring to Summer
Further Information
Plant Characteristics
Attracts Pollinators
Growing Conditions
- Drought Tolerant
- Frost Tolerant
- Heat Tolerant
About Mammoth Blend Sweet Pea Seeds
Lathyrus odoratus
1''–2" flowers with moderate scent in shades of rose, blue, salmon, scarlet, white, lavender, and burgundy.
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 bloom. Ideal soil temperature is 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: 14 Total 4 star reviews: 1 Total 3 star reviews: 0 Total 2 star reviews: 2 Total 1 star reviews: 1
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Rating
Which best describes you as a gardener?
18 reviews
- Rhonda K.Verified BuyerRated 5 out of 5 stars5/14/26Update on different color blooms
I have more different colored blooms now! These beauties have gotten pretty tall about 6.5 ' high
Which best describes you as a gardener? IntermediateBIBotanical Interests5/15/26Hey Rhonda,
Wow, 6.5 feet tall with multiple colors blooming - that's absolutely incredible! Your Mammoth Blend Sweet Peas are really living up to their name. It sounds like you've created the perfect growing conditions for them to thrive and show off all their beautiful color variations.
We love hearing success stories like this where our seeds exceed expectations. The fact that you're seeing such diverse blooms at that impressive height means you're in for quite the spectacular display! Thanks for sharing this awesome update with our community. Keep on growing 🌻
- Rhonda K.Verified BuyerRated 5 out of 5 stars4/19/26Sowed as instructed!
Beautiful blooms just not in every color .
Which best describes you as a gardener? IntermediateBIBotanical Interests4/19/26Hey Rhonda,
Thank you so much for this fantastic 5-star review of the Mammoth Blend Sweet Pea Seeds! It's wonderful to hear that you followed the sowing instructions and got those beautiful blooms - that's exactly what we love to see!
I totally understand the mixed feelings about not getting every single color in the blend. Sweet pea blends can sometimes be a bit unpredictable in terms of which colors decide to show up strongest in any given growing season. Sometimes certain colors in the mix are just more dominant or quicker to establish than others, even though they're all in there.
It sounds like you did everything right with your sowing technique though, and those beautiful blooms you're enjoying are proof of your great gardening skills! Sweet peas are such rewarding flowers to grow when they take off like yours have.
Thanks for sharing your experience with the Mammoth Blend - it really helps other gardeners know what to expect!
Keep on growing 🌻️
- Magda C.Verified BuyerRated 4 out of 5 stars4/10/26Somewhat disappointed
I planted both packages of seeds & had very few come up. I presoaked them as instructions indicated. Attaching a picture of what terminated. Expected more of the seeds to take hold because of the better quality of t he seeds.
Which best describes you as a gardener? IntermediateBIBotanical Interests4/12/26Hey Magda,
Thanks so much for taking the time to share your experience with the Mammoth Blend Sweet Pea Seeds—we really appreciate your honest feedback, and it sounds like you followed all the right steps with the presoaking.
We're sorry to hear that you didn't see the germination rate you were expecting from both packages. Sweet pea germination can sometimes be influenced by a few different factors beyond the seed quality—things like soil temperature, moisture levels, planting depth, and even the age of the soil can all play a role in how well seeds take hold.
That said, we definitely want to make sure you get the results you're looking for. We'd love to take a closer look at your situation and see how we can help ensure your next planting experience goes more smoothly.
We really value customers like you who give us detailed feedback—it helps us continue to improve. Thanks again for sharing your experience with us.
Keep on growing 🌻
- BriannaVerified BuyerRated 5 out of 5 stars8/26/25Easy to germinate, didn’t work out for me
These germinated well, were beautiful in bloom, but unfortunately didn’t work out for where I had them. I have a very dry and hot south facing garden and these would have been my best option for a sweat pea cultivar. Too hot though so I’m bummed I didn’t get to see them at their best.
Which best describes you as a gardener? IntermediateBIBotanical Interests8/26/25Hey Brianna,
Thank you so much for sharing your experience with our Mammoth Blend Sweet Pea Seeds! We're so glad to hear they germinated well for you and gave you beautiful blooms - that's wonderful! We totally understand the challenge with that hot, dry, south-facing spot though. Sweet peas can definitely be tricky in those intense heat conditions, even the more heat-tolerant varieties. It sounds like you really know your garden conditions well and were thoughtful about your variety choice. We appreciate you taking the time to share this helpful insight about growing conditions - it's really valuable for other gardeners who might be dealing with similar hot, dry spots! Keep on growing 🌻️
- Dorian D C.Verified BuyerRated 5 out of 5 stars2/12/255 Stars
my daughter told me about your company .. she only buys seeds from you! so I thought I'd give it a shot ..