As heatwaves intensify across the United Kingdom, with some regions experiencing prolonged dry spells and official drought status, gardeners are seeking ways to protect their plants. Several parts of the country have not seen rain for 43 days, and Amber heat-health alerts have been issued as temperatures climb.
Hydrangeas, a common garden shrub known for its colorful blooms, have been identified by the Royal Horticultural Society (RHS) as particularly vulnerable to the current hot weather. Their large leaves and flowers can lose moisture rapidly, especially when plants are in pots, exposed locations, or in soil that dries out quickly.
To help gardens thrive despite soaring temperatures and hosepipe bans, experts recommend prioritizing plant health, conserving moisture, and using water efficiently. Clair Albone, Senior Category Manager for Gardens at Wickes, noted that homeowners need to be prepared for increasingly hot and dry spells.
Water Management and Timing
While hosepipe bans are in effect in some areas, watering with a watering can is often still permissible, though gardeners should check local water supplier regulations. Jo McGarry, an expert in garden design, advises prioritizing moisture-loving plants and those planted in the current year, such as hydrangeas and ferns. Established shrubs and trees are generally more resilient to short dry periods.
Watering deeply at the base of plants, rather than frequent light sprays, is recommended. This practice encourages roots to grow deeper into the soil, where moisture is retained longer. Watering should ideally occur in the early morning or late evening when temperatures are cooler, minimizing moisture loss through evaporation. Michael Griffiths, author of 'The Easy Garden,' emphasized that this timing also promotes stronger root growth, making plants more resilient.
Sun Protection and Moisture Retention
Hydrangeas and other delicate plants can suffer from prolonged exposure to intense sun. Moving potted plants and hanging baskets to shadier areas during the hottest parts of the day can offer protection. Shade netting, garden fleece, or strategically placed umbrellas can also shield vegetable beds and sensitive plants. DIY shade canopies are suggested as an easy and effective solution.
Applying mulch around plants is another key strategy for retaining soil moisture. Organic materials like bark, compost, or well-rotted manure, as well as gravel, help reduce evaporation, suppress weeds, and regulate soil temperature. This reduces the need for frequent watering.
Plant Maintenance and Future-Proofing
Deadheading spent flowers can encourage new blooms and maintain plant health, especially during dry spells. This task is best done in cooler parts of the day using clean tools. Improving overall soil health is also crucial for gardens to withstand heatwaves. Adding compost or other organic matter to the soil helps it retain water more effectively.
Collecting rainwater in water butts provides an additional source for dry periods. Experts advise avoiding heavy pruning, planting, or feeding during heatwaves, as these activities increase water and energy demands for plants. Brown or yellow grass is often dormant and may recover when cooler, wetter weather returns; mowing should be avoided or done with raised blades to preserve moisture.
Drought-Tolerant Options
While many plants require extra care, some species are naturally more heat-tolerant. These include palms, lavender, rosemary, and veronica, which can provide structure, while plants like Baptisia, Heuchera, Osteospermum, Dahlia, Canna Tropicanna, Hibiscus, and Passiflora offer colorful displays. Agapanthus, yarrow, hollyhocks, and crocosmia are also noted for thriving in hot and dry conditions. However, newly planted flowers will still require regular watering as their roots develop.