Ageratum houstonianum 'Blue Horizon' F1

Producing large clusters of brilliant blooms, this makes an excellent cut flower as well as looking beautiful in drifts in garden borders. More
50 seeds 153062 £5.75 Delivery late April
When in stock, please allow up to 5 working days for despatch.

Or buy this as part of our Blue Mojito Collection.

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One of the longest cut flower and container plants you can grow, which thrives in sun and dappled shade. I love this planted and picked to arrange with purples, blues and greens. It literally glows.

If you have ordered these seeds, we have had unforeseen delays and they will now be available late March. We apologise for any inconvenience.

Genus Ageratum
Group/Species houstonianum
Variety Blue Horizon
Type Half-Hardy Annual
Common Name Mexican paintbrush 
Border Position Border (Middle)
Soil Type Broad Tolerance
Scent Unscented
Site Full Sun
Moisture Well-drained
Height 75cm (30in)
Spacing 45cm (18in)
Sowing, Seeds, Planting Sow indoors from February-April. Sow thinly onto the surface of moist, well-drained seed compost. Do not cover seed, seedlings should appear within 1-2 weeks. Transplant when large enough to handle into individual 8cm (3in) pots and grow on in cooler conditions. Gradually acclimatise to outdoor conditions over a fortnight before planting out once all danger of frost has passed. Prefers a sunny spot with fertile, moist but well-drained soil.
Care Tips Water regularly until established. Pick or deadhead to encourage more blooms.
Flowering June-August (or approximately 12 weeks from sowing)
Harvesting Flower production: 2-3 months
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
  • Sow Under Cover/Plant Indoors
  • Direct Sow/Plant Outdoors
  • Flowers/Harvest

We don't currently have additional advice on using / growing this particular product on our website, but if you do have a question that isn't answered on this page then please give us a call on 0345 092 0283 and we'll happily chat through any queries you may have, or email us at Please note all email replies are taking up to 10 working days.


Seeds Delivery - When in stock, please allow up to 5 working days for despatch.

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