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High Tide Blue Ageratum

These bright blue blossoms on 14-16" inch tall plants create a lovely border. Popular for its unique blue soft furry flowers, and long bloom time makes a nice counterpoint to the other colors in a bed. 

10 seeds



Ageratum houstorianum


Germination:5-10 days

Germination Temperature:Optimum soil temperatures 70-75ºF

Seed Planting Depth: Sow on the surface and press into soil, seeds need light to germinate

Starting Indoors:  Start indoors 6-8 weeks before the last frost. Provide 70-75ºF soil temperature. Transplant apart after the last frost, 12” apart.  

Sowing Outdoors:We do not recommend starting ageratum seeds outdoors

Growth Habit:Upright branching

Height and Width:14-16" x 12"

Spacing:12" apart

Light Needs: Full sun to part sun

Soil Needs:Fertile, well-drained

Approximate days to flower from seed: 90-100 days

Uses: Cut flowers, flower beds, containers, deer resistant, attracts pollinators

Care: Water seedlings regularly until established. Amend soil with compost before transplanting. Deadhead to encourage more flower production. Apply a liquid fertilizer every 3-4 weeks or use a time-release fertilizer at planting time. 

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Customer Reviews
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Kathleen D.
United States United States
I recommend this product
The Best Ageratum

After Ageratum ‘Leilani Blue’ inexplicably disappeared from the trade anywhere, I’ve come to accept this is the best one available for planting in perennial borders. It’s the perfect mid-border filler and I’ve even used it up front. ‘Blue Horizon’ is too tall for me, except for a few places. It’s the one annual I wouldn’t want to garden without! Wish the seeds weren’t so expensive because I could easy use at least 80.

Judith C.
United States
High Tide Blue Ageratum

All have germinated. Great luck last year. I put them in public gardens and they did very well with little care and dry conditions.