What To Know
- The answer is a resounding yes, especially if you choose to grow it in a tub.
- The first step in growing Gunnera in a tub is selecting the appropriate container.
- Place your Gunnera tub in a prominent location in your garden or patio, where its size and beauty can be fully appreciated.
The dramatic, prehistoric-looking foliage of Gunnera manicata, also known as the giant rhubarb or giant rhubarb palm, can make a stunning statement in any garden. But with its impressive size and vigorous growth, you might wonder if it’s possible to keep this behemoth under control. The answer is a resounding yes, especially if you choose to grow it in a tub. This guide will delve into the secrets of successfully cultivating Gunnera in a container, helping you bring this architectural beauty to your patio, balcony, or even your living room.
Choosing the Right Tub
The first step in growing Gunnera in a tub is selecting the appropriate container. Gunnera can grow quite large, with some varieties reaching heights of 10 feet or more. Therefore, you’ll need a tub that’s both spacious and sturdy. Here are some considerations:
- Size: Aim for a tub with a minimum diameter of 18 inches and a depth of at least 18 inches. For larger varieties, a 24-inch or even 30-inch tub is recommended.
- Material: Plastic tubs are lightweight and affordable, but they can crack under extreme temperatures. Fiberglass tubs are durable and weather-resistant, but they can be more expensive. Terracotta tubs are attractive but can be prone to cracking in cold climates.
- Drainage: Ensure the tub has drainage holes to prevent waterlogging. If your chosen tub lacks drainage holes, you can drill some yourself.
Planting Your Gunnera
Once you have your tub ready, it’s time to plant your Gunnera. Here’s how:
1. Prepare the Tub: Fill the tub with a good quality potting mix that’s well-draining. You can add compost or aged manure to the mix for extra nutrients.
2. Position the Gunnera: Gently remove the Gunnera from its nursery pot, being careful not to damage the roots. Place it in the center of the tub, ensuring the crown is level with the soil surface.
3. Backfill the Tub: Add more potting mix around the roots, filling the tub up to about an inch below the rim. Gently firm the soil around the plant.
4. Water Thoroughly: Give the newly planted Gunnera a good watering to settle the roots.
Providing the Right Conditions
Gunnera thrives in moist, fertile conditions. Here’s how to create the perfect environment for your container-grown Gunnera:
- Sunlight: Gunnera prefers partial shade to full shade. Avoid planting it in direct sunlight, especially during the hottest part of the day.
- Watering: Keep the soil consistently moist but not waterlogged. Water deeply when the top inch of soil feels dry. During hot, dry periods, you may need to water daily.
- Fertilizing: Feed your Gunnera regularly with a balanced liquid fertilizer every two weeks during the growing season.
- Winter Protection: Gunnera is hardy to Zone 6, but it’s best to protect it from harsh winters. In colder climates, you can move the tub to a sheltered location or wrap it with burlap.
Pruning and Maintenance
While Gunnera is a relatively low-maintenance plant, some basic care is necessary to keep it healthy and vigorous.
- Deadheading: Remove any spent flower stalks to encourage new growth.
- Pruning: In late fall, cut back the leaves to about 6 inches above the ground. This will help to prevent disease and encourage new growth in the spring.
- Repotting: Every few years, you may need to repot your Gunnera into a larger tub as it grows. Choose a tub that’s about 2-3 inches wider than the previous one.
Enjoying Your Giant Beauty
With proper care and attention, your Gunnera will reward you with its dramatic foliage and architectural presence. Here are some tips for enjoying your container-grown Gunnera:
- Use it as a Focal Point: Place your Gunnera tub in a prominent location in your garden or patio, where its size and beauty can be fully appreciated.
- Combine it with Other Plants: Pair your Gunnera with other shade-loving plants, such as ferns, hostas, and begonias, to create a lush and inviting landscape.
- Create a Tropical Oasis: In a container, Gunnera can help to transform your patio or balcony into a tropical oasis. Add a few brightly colored flowers and some tropical-inspired decor for a truly exotic feel.
A Final Word: Moving Beyond the Ordinary
Growing Gunnera in a tub allows you to enjoy this magnificent plant even if you have limited space. By following these simple tips, you can cultivate a giant beauty that will make a bold statement in your garden, patio, or even your home. So, embrace the extraordinary and let your Gunnera take center stage!
Frequently Discussed Topics
Q: Can I grow Gunnera in a smaller tub?
A: While it’s possible to grow Gunnera in a smaller tub, it will limit its growth potential. For optimal growth and size, a larger tub is always recommended.
Q: How often should I fertilize my Gunnera?
A: Fertilize your Gunnera every two weeks during the growing season with a balanced liquid fertilizer. You can also use a slow-release fertilizer, but it might not provide the same level of nutrients.
Q: Can I overwinter my Gunnera in the tub?
A: In milder climates, you may be able to overwinter your Gunnera in the tub by placing it in a sheltered location or wrapping it with burlap. However, in colder climates, it’s best to bring the tub indoors or store it in a frost-free environment.
Q: Can I propagate Gunnera from cuttings?
A: Yes, you can propagate Gunnera from cuttings. Take root cuttings in the spring or summer, and plant them in a well-draining potting mix. Keep the cuttings moist and in a warm location until they root.
Q: What are some other varieties of Gunnera that I can grow in a tub?
A: Gunnera manicata is the most common variety, but other species like Gunnera tinctoria and Gunnera chilensis are also suitable for container growing. These varieties may have slightly different growth habits and cold hardiness, so be sure to research them before planting.
