Gunnera manicata in Devon Gardens

Discovering the majesty of the giant rhubarb 

When creating a dramatic and exotic atmosphere in your Devon garden, few plants can rival the splendour of Gunnera manicata, commonly known as giant rhubarb. Originating from the lush regions of Brazil and Chile, this plant is a true botanical marvel that captivates with its immense leaves and striking presence. Let’s delve into the world of Gunnera manicata and explore why it has become a cherished addition to gardens around the globe.

A Giant Among Plants

Gunnera manicata is renowned for its colossal leaves of – up to 11 feet in diameter. These massive, lobed leaves create a canopy of green, providing a unique and tropical feel to any garden space. The plant’s architectural form and vibrant foliage make it a standout specimen, perfect for creating a focal point or adding a touch of the exotic to a landscape.

Ideal Growing Conditions

To thrive, Gunnera manicata requires a specific set of conditions that mimic its native habitat. It flourishes in moist, well-drained soil rich in organic matter. This plant loves water and will do best in areas with consistent moisture, such as the edges of ponds or streams. It can also tolerate partial shade, making it versatile for placement within your garden.

Planting and Care Tips

– Location: Choose a location that provides ample space for the plant to spread its impressive leaves. Gunnera manicata needs room to grow and should not ‘be crowded’ by other plants.

– Soil: Ensure the soil is rich in organic matter and retains moisture. Adding compost or well-rotted manure can help improve soil quality and provide the necessary nutrients.

– Watering: Keep the soil consistently moist, especially during dry periods. A thick mulch layer can help retain soil moisture and protect the plant’s roots.

– Winter Protection: In colder climates – Gunnera manicata may need protection during winter. Covering the crown with a thick layer of straw or horticultural fleece can help safeguard it from frost damage.

Garden Design Ideas

Gunnera manicata’s dramatic appearance provides versatility for various garden styles. Here are some ideas to incorporate this giant into your landscape:

– Water Features: Plant Gunnera manicata near ponds, streams, or water gardens to create a lush, tropical ambience.

– Woodland Gardens: Its ability to thrive in partial shade makes it an excellent choice for woodland or shaded garden areas.

– Focal Points: Use Gunnera manicata as a focal point in large garden beds or mixed borders to draw attention and create visual interest.

– Exotic Themes: Pair it with other exotic plants such as ferns, bamboo, and tropical flowers to enhance the overall effect.

The Environmental Impact

While Gunnera manicata is a stunning addition to gardens, it’s essential to be aware of its environmental impact. In some regions, related species like Gunnera tinctoria have become invasive, spreading rapidly and outcompeting native flora.
Unfortunately, Gunnera manicata is now known to be invasive, so it’s always good practice to monitor its growth and ensure it doesn’t spread into surrounding areas.

Legal Considerations: The UK Ban

As part of its ongoing efforts to control invasive species and protect native ecosystems, the UK government has recently decided to ban the sale and cultivation of Gunnera species, including Gunnera manicata. This move is in response to concerns over the potential for these plants to spread uncontrollably and disrupt local habitats. The ban – similar to the restrictions placed on Japanese knotweed, means that Gunnera manicata cannot be sold or planted, and existing specimens must be managed to prevent their spread – including regular monitoring and maintenance to prevent the plant from becoming invasive. The goal is to balance the enjoyment of this magnificent plant with the need to protect the natural environment.

Conclusion

Gunnera manicata is a true gem for gardeners seeking to add a touch of the extraordinary to their landscapes. Its immense leaves and dramatic form offer a unique aesthetic that few plants can match. By providing the right conditions and care, you can enjoy the majestic beauty of this giant rhubarb and transform your garden into a lush – tropical paradise. However, it’s crucial to be mindful of legal restrictions and environmental responsibilities, especially in regions like the UK, where the plant is now banned.