(C) Cosmee Rubenza seeds 0.2g (415250)

Condition: New

(C) KS15

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Cosmos 'Rubenza'
Botanical Name: Cosmos bipinnatus 'Rubenza'
Type: Half-Hardy Annual

Cosmos 'Rubenza' is a dramatic and richly coloured cosmos variety, cherished for its deep ruby-red blooms that gradually fade to vintage rose as they mature. These elegant, daisy-like flowers are held on tall, airy stems above feathery foliage, bringing a soft, romantic feel to borders and cutting gardens. Flowering from midsummer to autumn, it’s a must-have for adding height, colour, and movement to any sunny garden space.

Plant Details

Type: Half-hardy annual
Height: 100–110 cm
Spread: 30–45 cm
Flowers: July – October
Position: Full sun; well-drained soil

Growing Information

Sow: Indoors March–April or direct sow after last frost (May–June)
Germination: 7–14 days at 18–21°C
Tip: Harden off before planting out; pinch young plants to encourage bushiness
Spacing: 30 cm apart
Care: Deadhead regularly to prolong flowering; protect from strong winds

Why You’ll Love It

Stunning ruby-red blooms that fade beautifully over time
Tall, graceful plants perfect for the back of borders
Attracts bees, butterflies, and other pollinators
Ideal for cut flowers – long-lasting in vases

Top Tip
Sow in succession for a longer display and mix with lighter cosmos varieties for a striking colour contrast.

Perfect For

Cottage and cutting gardens
Pollinator-friendly spaces
Late-season floral displays
Elegant, airy border planting

Hashtags
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