Hydrangeas are a popular choice for British gardens, known for their vibrant, long-lasting blooms and ability to thrive in various conditions. Here, plant expert Chris Bonnett shares his top tips for planting, pruning, and caring for these beautiful plants.
Planting Hydrangeas:
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Choose the Right Location:
Hydrangeas prefer partial shade, especially on hot days. Aim for a spot with morning sun and afternoon shade. Containers are also a great option for moving them out of harsh sun.*
Prepare the Soil:
Hydrangeas thrive in well-drained, fertile soil rich in organic matter. Amend heavy clay or sandy soil with compost or well-rotted manure.*
Planting Time:
Spring and autumn are the best times to plant hydrangeas. If planting in summer, ensure consistent watering until established.*
Planting Depth:
Dig a hole twice as wide and deep as the root ball. Place the hydrangea in the hole, ensuring the top of the root ball is level with the soil surface. Fill with soil, firming gently around the roots, and water thoroughly.Pruning Hydrangeas:
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Know Your Hydrangea Type:
Different hydrangea types require different pruning methods. Mophead and lacecap hydrangeas (Hydrangea macrophylla) need minimal pruning, while panicle (Hydrangea paniculata) and smooth hydrangeas (Hydrangea arborescens) benefit from more significant pruning.*
Timing:
Prune mophead and lacecap hydrangeas in late winter or early spring, removing dead wood and old flower heads. For panicle and smooth hydrangeas, prune in late winter before new growth begins.*
Pruning Technique:
Remove dead, damaged, or diseased stems. For mopheads and lacecaps, cut back to just above a pair of healthy buds. For panicle and smooth hydrangeas, cut back the previous season’s growth to a healthy pair of buds.General Care for Hydrangeas:
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Watering:
Hydrangeas need regular watering, especially during hot, dry spells. Keep the soil consistently moist but not waterlogged. Water at the base of the plant to avoid wetting the leaves.*
Mulching:
Apply a layer of mulch around the base of the hydrangeas to retain moisture, suppress weeds, and regulate soil temperature.*
Feeding:
Feed hydrangeas with a balanced, slow-release fertiliser in spring. Avoid high-nitrogen fertilisers as they can promote leaf growth at the expense of flowers.*
Pest and Disease Control:
Keep an eye out for common pests like aphids and spider mites. Treat any infestations promptly with a suitable insect control product or neem oil. Ensure good air circulation around the plants to prevent fungal diseases like powdery mildew.*
Adjusting Bloom Colour:
For Hydrangea macrophylla, you can adjust the bloom color by changing the soil pH. For blue flowers, add aluminium sulphate to the soil to lower the pH. For pink flowers, add lime to raise the pH.*
Winter Care:
In colder months, protect container-grown hydrangeas from frost by moving them to a sheltered location or wrapping the container with insulating materials. Water sparingly during winter.*
Re-potting:
Every few years, re-pot the hydrangea into a larger container or refresh the soil to ensure it has enough nutrients and space for growth.By following these expert tips, you can ensure your hydrangeas thrive and continue to be a stunning focal point in your garden for years to come.
