How to Grow Bleeding Heart (Clerodendrum thomsoniae)

Few climbers rival the dramatic charm of Clerodendrum thomsoniae, commonly known as Bleeding Heart. When in full bloom, its brilliant red flowers emerge from crisp white bracts, creating a striking two-toned display that instantly draws attention. In warm gardens, it flowers generously from mid-summer into early autumn, transforming walls, pergolas and trellises into vibrant focal points. 

If you are looking for fast vertical coverage combined with bold seasonal colour, this climber is an excellent choice. 

A tropical showpiece 

Native to West Africa, Bleeding Heart is a twining climber that remains evergreen in warm climates and semi-deciduous in cooler winter climates. Its glossy green leaves form a lush backdrop for clusters of small tubular red flowers surrounded by white, lantern-shaped calyxes. This unusual contrast gives the plant its memorable common name. 

Given a sturdy structure, it quickly establishes itself and begins to scramble upward, softening hard surfaces with lush foliage and vibrant flowers. 

Planting for success 

Choosing the right position is the key to strong growth and heavy flowering. 

Bleeding Heart performs best in: 

• Full sun for maximum flowers
• Light afternoon shade in very hot regions 
• Rich soil improved with compost
• Well-drained conditions 

Too much shade encourages leafy growth at the expense of flowers, while poor drainage can lead to root problems and general decline. 

During summer, water regularly to keep the plant actively growing. Allow the top layer of soil to dry slightly between waterings. In winter, especially in cooler regions, reduce watering as growth slows. 

How to encourage more flowers?

If your plant looks healthy but produces few blooms, the cause is usually one of the following: 

• Insufficient sunlight 
• Too much nitrogen-rich fertiliser 
• No annual pruning 
• Nutrient-poor soil 

To improve flowering, add compost in early spring and feed monthly during the growing season with a fertiliser higher in potassium. This supports bud formation and stronger blooms. 

Most importantly, prune each year. Bleeding Heart flowers most heavily on strong new growth, so encouraging fresh shoots is essential. 

Pruning for better performance 

Prune in early spring before new growth begins. Cut back long or leggy stems to create a tidy framework and encourage bushier growth. 

Do not be hesitant. This climber responds well to firm pruning and quickly produces vigorous new shoots. Without regular pruning, plants can become thin and flower less over time. 

Growing in cooler areas 

Bleeding Heart prefers frost free conditions and thrives in warm climates. In colder gardens, plant in a sheltered position such as against a warm wall, and apply mulch around the root zone during winter. 

In areas with severe winters, growing the plant in a large container is often the safest option. This allows it to be moved under cover when temperatures drop. Even if frost causes leaf drop, established plants often reshoot once warmer weather returns. 

Ideal for containers and small spaces 

This climber adapts well to container growing, making it suitable for patios and balconies. 

For best results: 

• Use a pot at least 40 to 50 centimetres wide
• Ensure excellent drainage
• Provide a sturdy support structure

Container-grown plants require more frequent watering and feeding than those planted in the ground. 

A bold addition to the garden 

Bleeding Heart is particularly effective where vertical colour is needed. It works beautifully over pergolas, along boundary walls, on balcony trellises and in courtyard gardens where strong architectural lines benefit from softer planting. 

With warmth, sunlight and good drainage, Clerodendrum thomsoniae is a rewarding climber that delivers months of vibrant summer colour. Provide support, feed regularly and prune annually, and it will quickly become one of the highlights of your garden.