Customer Service Hours
Mon-Fri 8-4 MST
Features
Family
Asteraceae
Native
Southern Mexico, Belize, and Honduras
Life Cycle
Annual
Plant Height
Tall (Greater than 24")
Flower Color
Purple
Bloom Season
Summer to frost
Further Information
Plant Characteristics
- Attracts Beneficial Insects
- Attracts Pollinators
- Cut Flower
Plant Resistance
- Deer Resistant
- Rabbit Resistant
About More Flowers
Ageratum houstonianum
½" bluish-purple pom-pom-like flowers with feathery petals borne in clusters.
Planting More Flowers
Plant Spacing
A group of 3 seeds every 12"
Light Required
Full sun to part shade
Plant Height
Tall (Greater than 24")
Planting Depth
Press seed into soil surface
Planting Details
| Seed Depth | Press seed into soil surface |
|---|---|
| Seed Spacing | A group of 3 seeds every 12" |
| Thinning | When 2" tall, thin to 1 every 12" |
| Germination | 7–10 days |
| Start Indoors | RECOMMENDED. 6 to 8 weeks before your average last frost date. 70°F is ideal for germination. |
| Direct Sow | Not recommended except for very mild climates, 2 to 4 weeks after your average last frost date. |
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: 11 Total 4 star reviews: 1 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 1
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Rating
Which best describes you as a gardener?
13 reviews
- Douglas D.Verified BuyerRated 5 out of 5 stars4/18/26All seeds germinated
All the seeds germinated and they are currently growing under my plant light. Up here in central New York State they can't be planted outside until end of May.
Which best describes you as a gardener? IntermediateBIBotanical Interests4/19/26Hey Douglas,
Thank you so much for the 5-star review! That's fantastic news that all your Blue Planet Ageratum seeds germinated - what a great success rate! It sounds like you're giving them the perfect start under your plant light while you wait for the weather to warm up. End of May is definitely the smart move for central New York - those last frost dates can be tricky! Your patience will pay off when you get those beautiful blue blooms in your garden. Keep on growing 🌻
- Debra V.Verified BuyerRated 5 out of 5 stars4/8/26Great seed.
I was running low on these seeds and decided to go with Botanical Interests. I had great germination and the seedlings are growing like crazy. Looking forward to planting them out in a few weeks.
Which best describes you as a gardener? IntermediateBIBotanical Interests4/12/26Hey Debra,
We're so thrilled to hear your Blue Planet Ageratum Seeds had such fantastic germination and those seedlings are growing like crazy! It sounds like you've got some healthy little beauties on your hands. These gorgeous blue blooms are going to add such stunning color to your garden once you get them planted out. You're going to love how they attract butterflies and provide that beautiful blue carpet effect! Keep on growing 🌻️
- Denise H.Rated 1 out of 5 stars10/20/241 Star
I buy these seeds every year, however, they have never grown for me. I end up buying starts at local nurseries. No more seeds!
- Dolores C.Verified BuyerRated 5 out of 5 stars7/6/245 Stars
I lover the tall blue ageratum seeds I purchased from Botanical Interests. The foliage on the plants is lush with lots of branching and the seeds germinated well.
- Kim M.Verified BuyerRated 5 out of 5 stars6/28/235 Stars
Looking forward to planting and seeing these beauties grow. Easy to grow. The flowers in the picture are from my garden today. I live in Zone 9 and look how healthy they are. 100° today.