Customer Service Hours
Mon-Fri 8-4 MST
Features
Family
Brassicaceae
Native
Europe
Life Cycle
Annual
Plant Height
Medium (12" - 24")
Further Information
Plant Characteristics
Good for Containers
Growing Conditions
Frost Tolerant
About Waltham 29 Broccoli Seeds
Brassica oleracea var. italica
Plants produce a medium-sized, 4"–6" main head followed by smaller 1" side shoots.
Planting Broccoli
Days to Maturity
75 days
Plant Spacing
A group of 3 – 4 seeds every 24"
Light Required
Full sun
Plant Height
Medium (12" - 24")
Planting Depth
⅛"
Coverage & Planting Details
| Coverage | This packet sows up to 320 feet. |
|---|---|
| Row Spacing | 24"–36" |
| Seed Depth | ⅛" |
| Seed Spacing | A group of 3 – 4 seeds every 24" |
| Thinning | When 2" tall, thin to 1 every 24" |
| Germination | 7–14 days |
| Start Indoors | RECOMMENDED. 4 to 6 weeks before transplanting outside after your average last frost date, or 12 weeks before your average first fall frost date. In mild climates, sow in fall for harvest in late winter and early spring. Ideal soil temperature for germination is 70°–85°?, cooler (60°F) growing temperatures thereafter. |
| Direct Sow | 4 to 6 weeks before your average last frost date, or when soil temperature is at least 40°F, ideally 60°-85°F. Also in late summer for fall harvest. Mild Climates: Best sown in fall or winter for cool-season harvest. |
| Growing & Harvesting | Harvest when florets are enlarged but still closed. This will encourage large numbers of side florets. |
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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Rating
Which best describes you as a gardener?
20 reviews
- Pablo R.Verified BuyerRated 4 out of 5 stars9/4/26Great success
At least for now, 100% germ rate for a couple 6 cell trays. Growing nicely.
Which best describes you as a gardener? IntermediateBIBotanical Interests9/9/26Hey Pablo,
We're so happy to hear that your Waltham 29 Broccoli Seeds are off to such a great start with a 100% germ rate! It's awesome that they're growing nicely in your trays! Thanks so much for being part of the growing community! Keep on growing 🌻
- Cindy C.Verified BuyerRated 4 out of 5 stars8/14/26Nice!
These grew well, unfortunately the greenhouse was too hot and they bolted. Maybe next year,
Which best describes you as a gardener? IntermediateBIBotanical Interests8/17/26Hey Cindy,
Thank you so much for taking the time to share your thoughts in a review. We're glad to hear that the seeds grew well for you! We appreciate you noting the bolting issue you experienced with the heat in your greenhouse - that's helpful feedback for us. Your feedback is invaluable to us, and we're committed to ensuring your experience is positive. We hope you'll give the Waltham 29 another shot next year. Keep on growing 🌻
- Hanna S.Rated 1 out of 5 stars6/16/26Incorrect quantity in description
when i opened the package, there's only ~50 seeds instead of ~360 seeds like the description, very disappointed 😞
Which best describes you as a gardener? BeginnerBIBotanical Interests6/16/26Hey Hanna,
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 🌻️
- Robin H.Verified BuyerRated 5 out of 5 stars5/27/26All seeds sprouted well.
All seeds sprouted well.
Which best describes you as a gardener? BeginnerBIBotanical Interests6/3/26Hey Robin,
Fantastic news about your Waltham 29 Broccoli Seeds sprouting so well! There's nothing better than seeing those little green seedlings emerge with perfect germination. You're well on your way to some delicious homegrown broccoli heads! Thanks for sharing your Waltham 29 sprouting success with us! Keep on growing 🌻️
- Laura S.Verified BuyerRated 5 out of 5 stars2/22/26These grew very well!
These broccoli seeds grew astonishingly well once I planted them! I will definitely be buying from Botanical Interests again in the future.
Which best describes you as a gardener? ProfessionalBIBotanical Interests2/25/26Hey Laura,
That's wonderful! We're so thrilled to hear your Waltham 29 Broccoli Seeds grew astonishingly well! There's nothing quite like watching those broccoli plants take off and knowing you'll soon have delicious, homegrown heads ready for harvest. We're so glad you had such a fantastic experience with us and we can't wait to help you grow even more amazing vegetables in the future. Thank you for choosing us and for sharing this awesome success story with us. Keep on growing 🌻️