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Gunnera manicata, also known as giant rhubarb, is a large herbaceous perennial that can grow up to 2.5 meters tall and 4 meters wide. It is native to South America but can also be found in the UK. Here are some care instructions for Gunnera manicata if grown outdoors in the UK:
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Location: Choose a location that provides ample space for the plant to grow and spread, and where it can receive partial shade to full sun. Gunnera manicata prefers moist, boggy soil and can thrive near a pond or stream.
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Soil: The soil should be rich in organic matter and have a pH between 5.5 and 6.5. It should also be kept consistently moist, but not waterlogged.
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Watering: Gunnera manicata requires frequent watering, especially during the summer months. Water the plant deeply once or twice a week, depending on the weather and soil moisture.
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Mulching: Mulching around the plant with organic matter can help retain soil moisture and keep the soil cool.
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Fertilizing: Feed the plant with a balanced fertilizer in the spring when new growth appears.
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Pruning: Prune back any dead or damaged leaves in the spring. Cut back the old flower stems in late autumn to prevent the plant from self-seeding and to tidy up the appearance.
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Winter protection: Gunnera manicata is not fully hardy in the UK and may need winter protection in colder regions. Cover the crown of the plant with a thick layer of mulch or straw to protect it from frost.
