Mr Fothergills Cosmos Rubenza Seeds Dark Ruby to Old Rose Summer Blooms
Mr Fothergills Cosmos Rubenza Seeds (Cosmos bipinnatus) produce striking dark ruby-red flowers that gradually mature to a soft old rose, giving each plant a unique tonal effect. This half-hardy annual is perfect for borders, containers, and cutting gardens, offering manageable mid-height growth and long-lasting summer colour.
Key Features
Unique Colour Change Dark ruby blooms fade to old rose as flowers mature, creating a natural gradient effect.
Pollinator-Friendly Nectar-rich flowers attract bees, butterflies, and other beneficial insects.
Half-Hardy Annual Flowers the same year as sowing, providing rapid summer colour.
Ideal for Cutting Perfect for fresh bouquets or indoor arrangements.
Mid-Height & Manageable Grows to 90cm (36in), ideal for borders, containers, or random planting patterns.
Full Sun Requirement Thrives in bright, sunny positions for best flowering.
Product Description
Cosmos Rubenza (Cosmos bipinnatus) is a vibrant half-hardy annual that adds drama and elegance to summer gardens. Its dark ruby-red blooms gradually soften to old rose, producing a dynamic, tonal display throughout the flowering season from June to October. Growing to a manageable 90cm (36in), these plants are perfect for borders, containers, or cut flower displays. They are highly attractive to pollinators, supporting garden wildlife while adding continuous summer colour. A Best Buy variety recommended by gardening press and consumer groups, Cosmos Rubenza thrives in full sun and well-drained soil, making it both beautiful and easy to grow.
Sow seeds indoors before the last frost or directly outdoors after frost risk has passed
Plant in well-drained soil with full sun exposure
Water moderately until seedlings are established
Space plants adequately to allow airflow and prevent flopping
Deadhead regularly to encourage prolonged flowering
Why Choose These Seeds?
Mr Fothergills Cosmos Rubenza is perfect for gardeners who want unique, colour-changing blooms with pollinator appeal. With manageable height, suitability for containers and borders, and long-lasting cut flower potential, these seeds add summer drama, beauty, and versatility to any garden.
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