About
'Rubenza' is a half-hardy annual that grows up to 75 cm tall, featuring finely divided, fern-like leaves. Its large, deep red flowers have a velvety texture, which gradually transition to a warm pink as they mature, creating a two-tone appearance.
About the genus
Cosmos comprises both annual and perennial species characterized by either simple or pinnately divided foliage. These plants produce sizable, long-stemmed flowers resembling daisies during the summer months.
Growing conditions
- Sunlight
- Full sun
- Soil type
- Chalk, Clay, Loam, Sand
- Soil pH
- Acid, Alkaline, Neutral
- Soil moisture
- Moist but well-drained
- Aspect
- South-facing, West-facing, East-facing
- Exposure
- Sheltered
- UK hardiness
- H3
Plant details
- Plant type
- Annual Biennial
- Habit
- Columnar upright
- Foliage
- Deciduous
- Height
- 0.5-1 metres
- Spread
- 0.1-0.5 metres
- Time to full height
- 1 year
- Suggested uses
- Cottage and informal garden, Patio and container plants, Wildlife gardens
Care notes
- Cultivation
- Grow in moist, but well-drained soil in full sun. Suited to annual or cut-flower borders or as a summer infill
- Pruning
- Deadhead to prolong the flowering season
- Propagation
- See sowing seeds indoors
- Pest resistance
- May be susceptible to aphids and slugs
- Disease resistance
- May be susceptible to grey moulds