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Cosmos bipinnatus Rubenza

Bursting with energy, enthusiastically flowering their hearts out all summer long, straining to become the best bloomer in the border before the season's end, but that isn’t the end of the show. Collect the seeds to raise plants for subsequent years. Prefer well-drained soil in sun or part shade.
Ruby red blooms mature to stunning rose red. Height 75cm (30"). Spread 30cm (12").
Flower Colour

Type of garden
Container Gardening, Cottage Garden, Cutting Garden, Prairie Style planting

Flowers For Cutting/Drying, Foliage/Stem/Fruit Interest, Ideal for Beginners, NEW This Year, Suitable for Container

April onwards

Flowering Time
Autumn, Long Flowering, Summer

Sun or Partial Shade

60cm (24")

120cm (48")

Cosmos bipinnatus


Moderatly fertile, well drained soil but happy in poor soil




Good for cutting


July to September

Additional Information

Pretty ferny foliage. Dead head regularly to prolong flowering. Any flowerheads left on will self seed. Propagate by sowing seed in mid spring. Half hardy annual.

Delivery Date: 04 May 2018 (+/- 14days)
Plant Hardiness

How hardy are our plants?

All our plants have a guideline temperature for how well they will tolerate winter cold.

Fully hardy perennials will withstand temperatures down to -15 °C (5°F) and often lower.
Hardy perennials are happy down to at least -5°C (23°F)
Half hardy perennials can withstand down to around 0°C (32°F)
And Tender perennials may be damaged by temperatures below 5°C (41°F)

Please remember that temperatures can vary significantly within quite a small area, and hardiness can be affected by soil, position and other factors.
If in doubt please give us a call.

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"Thank you ladies for your beautiful plants.
Praise also, for the Bulrush Compost, of which I have purchased 8 bags during the past six months. It is superb and my garden has flourished.
Bless you,
Kind wishes"
Janet Morgan
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