Cosmos bipinnatus 'Rubenza'

Cosmos bipinnatus 'Rubenza' is an even darker, richer and more luscious colour than Cosmos 'Antiquity' or 'Dazzler', and Rubenza is a short cosmos too so should not need staking in a sheltered spot. More
10 seedlings 510702-10 £8.95
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5 seedlings 510702-5 £5.95
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Or buy this as part of our Dark Cosmos Collection.

More Details

Cosmos bipinnatus 'Rubenza' is an even darker, richer and more luscious colour than Cosmos 'Antiquity' or 'Dazzler' and is a shorter variety too, so should not need staking in a sheltered spot.

Genus Cosmos bipinnatus
Variety Rubenza
Type Half-Hardy Annual
Border Position Back, Middle
Soil Type Chalky, Neutral
Scent Unscented
Site Full Sun, Shelter
Moisture Well-drained, Moist but Well-drained
Height 75cm (30in)
Spacing 30cm (12in)
Sowing, Seeds, Planting Sow under cover in mid spring and plant out after last frosts, or direct sow early May.
Care Tips Pinch out tips at 15-20cm to encourage bushier plants. This is a perfect variety for growing in container pots.
Flowering June - November, 12-14 weeks from sowing
Vase Life 7-10 days, no conditioning needed. Pick fresh straight into water, just as the buds are about to bloom, and do not pick in the heat of the day. Deadhead the main blooms that are drooping and going over after about a week. Place out of direct sunlight.
Harvesting Flower production: 4-5 months.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
  • Sow Under Cover/Plant Indoors
  • Direct Sow/Plant Outdoors
  • Flowers/Harvest
Advice & Videos
How to plant and grow cosmos

Even if you only have a tiny garden – or just some pots – you have to grow at least one cosmos. They are the lowest maintenance, floweriest...

Direct sowing seeds

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Cosmos bipinnatus 'Rubenza' reviews

* * * * * Average based on 2 reviews
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Stunning

* * * * *

Reviewed 19th June 2015 by Chris Page

A beautiful ruby red cosmos, which fade to a pale terracotta red. So the combination of flower colour on one plant is stunning. One I plan to grow again.

Champion of the clarets!

* * * * *

Reviewed 8th October 2014 by Arthur Parkinson

Not only does this annual have one of the most sumptuous titles but it's also a worthy choice as a summer bloomer. Shorter than others so not needing to normally be staked this more dainty cosmos gives just as much punch with it's deep claret petals and honey yellow Center. I love it paired with cerinthe major.