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
40 seeds 030107 £2.25 In stock
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Items will be despatched in 5-7 working days.
5 seedlings 510702-5 £5.95 Delivery mid April
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When in stock, please allow up to 1 week for delivery.
10 seedlings 510702-10 £9.95 Delivery mid April
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When in stock, please allow up to 1 week for delivery.

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
Group/Species bipinnatus
Variety Rubenza
Type Half-Hardy Annual
Common Name Cosmos
Border Position Back, Middle
Soil Type Chalky, Neutral
Scent Unscented
Site Full Sun, Shelter
Moisture Moist but Well-drained, 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,...

Direct sowing seeds

Learn how to get great results when direct sowing hardy annual seeds.

Delivery

Plant Delivery - When in stock, please allow up to 1 week for delivery.

Seeds Delivery - Items will be despatched in 5-7 working days.

Click here to find out more information about our delivery rates and times.

Cosmos bipinnatus 'Rubenza' reviews

* * * * * Average based on 16 reviews

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Reviewed 13th November 2018 by C Payne-Johnson

OK earlier iin summer. Died down in autumn

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Reviewed 9th November 2018 by Susan

Some where better than others, but having said that some are still flowering so that's not bad.

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Reviewed 7th November 2018 by Anita

Fabulous growth and flowers

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Reviewed 31st October 2018 by Carolyn

Very healthy seedlings which grew well once potted on. The flowers were lovely but sadly the slugs have enjoyed them too.

* * - - -

Reviewed 4th October 2018 by Poppy

2 seedlings dead on arrival

Reply from the Sarah Raven Team:

"Thank you for leaving your review. We are very sorry to hear of your disappointment with your Cosmos Seedlings and have refunded you for them."

Posted 7th November 2018

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Reviewed 19th September 2018 by Sarah

Service is great from Sarah Raven and the emails and information are brilliant. As a result I bought a lot in 2018. I know the weather was v difficult but I am really disappointed by results from the Sarah Raven plants.

Reply from the Sarah Raven Team:

"Thank you for leaving your review. We are very sorry to hear of your disappointment with your Cosmos seedlings and have refunded you for them."

Posted 7th November 2018

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Reviewed 14th September 2018 by Sue

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Reviewed 13th September 2018 by VANESSA

WOW! These seedlings are now giants and still flourishing bringing great height and colour to my teeny / weeny city garden.
The butterflies love them and the bees have been hovering these last few days.
I planted them in various sized pots I didn't realise they would need staking, the stems are now like trunks.
I'll definitely order them again next year.

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Reviewed 12th September 2018 by ANN

That I've rated them 4 stars means that I as cultivator was lacking a certain skill!

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Reviewed 8th September 2018 by Margaret

These, plus all the other cosmos I bought have been amazing. Still loads of flowers still to come. A real show stopper. Will be re ordering next year

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Reviewed 6th September 2018 by Helene

Please see the comment left for "Cranberry click".

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Reviewed 3rd September 2018 by Lesley

Like these very much as planted with roses and blended well, not as tall and large flowered as others but lovely colour

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Reviewed 29th August 2018 by Michael

Another great favourite. I love the velvet red and yellow centre

New seedlings

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Reviewed 10th April 2018 by Ann

A gift from my daughter, 10 seedlings of Rubenza and 10 of Dazzler in beautiful condition, very strong. I am looking forward to seeing them grow.

Stunning

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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.