With deep red to brown velvety flowers, Chocolate Cosmos or Cosmos atrosanguineus gets its name from the colour of the flower as well as the fragrance of the flower.
A perennial originating from Mexico, Chocolate Cosmos thrives in warm climates and sunny positions. The flowers rise well above the foliage on tall, wiry stems, creating a light and airy display that works beautifully both in garden beds and containers.
While the flowers are visually striking, it is the fragrance that makes this plant especially appealing. The scent is sweet and subtle, often described as a blend of vanilla and chocolate, and becomes more noticeable late in the afternoon after a warm day. On hot, sunny days the perfume is at its strongest.
Popular cultivars such as ‘Cosmos Choca Mocha’ are well worth seeking out for their consistent flowering and fragrance.
In the garden, Chocolate Cosmos combines well with smaller salvias and lavender, which can also provide a degree of winter protection.
Landscaping Uses.
Chocolate Cosmos is primarily grown for its unique, velvety flowers. It performs best when planted where the blooms can rise above surrounding plants and be fully appreciated.
It is well suited to:
- Perennial borders, especially near the front
- Rock gardens where drainage can be controlled
- Container planting, including massed displays
The flowers attract bees and butterflies and are also excellent for cutting, making them a versatile addition to the garden.
Chocolate Cosmos Care
Good drainage and full sun are essential for success. Heavy clay soils are not suitable unless improved significantly.
- Soil: Humus-rich and well-drained, on the dry side in winter
- Watering: Allow soil to dry slightly between watering
- Fertiliser: Apply a liquid seaweed fertiliser every two weeks during active growth
In regions with cold or wet winters, lift and store the tubers until spring. In milder climates, ensure plants are well mulched and positioned in free-draining soil. Container-grown plants can be moved indoors over winter if needed.
Summary Information
- Height – Will reach around 30 – 50cm
- Spread – This is a tuberous rooted perennial that will form a clump to around 30cm over time.
- Soil – Humus rich well drained. Soil needs to be on the dry side in winter.
- Flower Colour – Chocolate Red to Brown.
- Foliage – Green
- Position – Full sun
- Flowering period – Summer to Autumn.
- Frost Tolerant – No
Propagation
Easy to propagate by basal root cuttings taken in late winter to early spring. The seeds of the plant are sterile.
Propagation
Propagation is best carried out by basal root cuttings taken from late winter through to early spring. Seeds are sterile, so division or cuttings are the only reliable methods.
FAQ
What does Chocolate Cosmos smell like?
The flowers have a light, sweet fragrance often compared to chocolate with hints of vanilla, strongest in warm afternoon conditions.
Can Chocolate Cosmos grow in pots?
Yes, it performs very well in containers provided the potting mix is free-draining and the plant receives full sun.
Is Chocolate Cosmos frost hardy?
No, it is not frost tolerant. In colder climates, tubers should be lifted and stored over winter or plants protected carefully.
Why isn’t my Chocolate Cosmos flowering strongly?
Insufficient sunlight, overly rich soil, or poor drainage are common causes. Ensure full sun and avoid heavy, wet soils.
WHERE TO BUY
412 James Lane, Fern Hill VIC. 3458 - Phone 0419002651
Large range of Rare plants, Climbers, Bulbs, Perennials Fruit Trees, Ornamental Trees and Shrubs. Available both Retail and by Mail Order
www.whitehousenursery.com.au
www.planterspatch.com.au