Add a touch of elegance and vibrant colour to your garden with Cosmos 'Rubenza'! This stunning variety of Cosmos bipinnatus features rich, ruby-red blooms that gradually soften to a rosy pink as they mature, creating a dynamic display of hues throughout the growing season.
Perfect for borders, beds, and cutting gardens, 'Rubenza' is a favorite among gardeners seeking an easy-to-grow plant with a long flowering period and a charming cottage garden appeal.
Key Features
- Spectacular Blooms: The large, semi-double flowers start in a deep, velvety ruby-red and fade to a soft, vintage pink, providing a captivating color progression.
- Extended Blooming Season: Enjoy continuous blooms from early summer until the first frost, keeping your garden vibrant and lively for months.
- Easy to Grow: Ideal for gardeners of all skill levels, 'Rubenza' thrives in full sun and well-drained soil, requiring minimal maintenance once established.
- Pollinator Friendly: Attracts bees, butterflies, and other beneficial insects, supporting your local ecosystem and enhancing biodiversity.
- Versatile Plant: Perfect for mixed borders, wildflower meadows, and cut flower arrangements. The airy, delicate foliage adds a soft texture to any planting scheme.
No. of Seeds: 40
Germination Temp: 15 - 18C
Ideal Plant Spacing: For this variety plant spacing is 60cm minimum, or 3 in a large container.
Sow Seeds from: Late Mar - Early June
Propagation of Cosmos Seeds
Cosmos are grown from large seeds, making them easy to sow. They germinate quickly and from then on - never stop. Whilst cosmos seeds can be directly seeded into your garden, an early, indoor start, translates into an earlier, so we recommend starting indoors. Sow seeds on a good quality compost straight into pots and cover lightly with compost or vermiculite. Germination of seeds is usually around 5 - 7 days. Do not place the seedlings outside until after the last frost date your area as cosmos plants are susceptible to frost.
How to Grow Cosmos Plants
The plants will flower and bloom best in full sun. They will grow well in a pretty much any soil, however add a general purpose fertiliser before planting if the soil is poor. We recommend you add a slow release fertilizer when planting, for season long feeding. Cosmos will begin to flower in early summer - after each set of blooms, deadhead spent flowers to promote reblooming. They are best placed towards the back of the flower garden, and are tolerant dry soil conditions.
Likely Cosmos Problems
Not a lot really - just keep watered.
