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Drought tolerant plants - Sarah Raven's top tips for sunny spots
As summers become hotter and drier, selecting drought-tolerant plants is increasingly important for maintaining a vibrant garden. This guide provides recommendations for plants that thrive in arid, Mediterranean-like conditions, suitable for various garden spaces, including pots, benches, and general landscaping. The focus is on robust plants that can withstand harsh summer heat and limited watering.
For potted plants, the key is to use large containers, which retain moisture more effectively than smaller ones. While small pots might require watering twice daily in peak summer, larger pots can reduce this to about three times a week. A useful formula for pot planting involves combining a 'Thriller' (the main showy flower), a 'Filler' (a delicate, easy-to-grow annual for a middle layer), and a 'Pillar' (a perennial climber providing height and, if trailing, acting as a 'Spiller'). An example of this combination includes Dahlia 'Molly Raven' as the Thriller, Hibiscus 'Mahogany' as the Filler, and Rhodochiton (purple bell vine) as the Pillar/Spiller. Another effective duo features Dahlia 'Waltzing Mathilda' paired with Thunbergia alata 'African Sunset' and 'Sunny Susie Brownie'. To support climbers and add drama, a frame made of bamboo canes, pea sticks, or a metal obelisk can be installed in the center of the pot.
For planting against walls or over fences, a practical approach is to place a slatted garden bench a short distance from the wall or fence. Three rosemary cuttings, such as the 'Tuscan Blue' hybrid, can be planted around the bench, with one underneath the back and two at each end. These plants will grow through the bench slats, creating a fragrant back and armrest. Rosemary is evergreen, completely drought-resistant, and provides continuous fragrance and blue flowers that attract bees and butterflies. Its branches can be harvested for culinary use. Lemon verbena can be added as a fragrant neighbor, though it is a scraggier shrub. For climbing plants on walls or fences, Cobaea scandens, also known as the cup and saucer plant, is recommended for its glamorous growth and tolerance to neglect, often continuing to grow through mild winters in sheltered locations.
Effective irrigation is crucial for maintaining a healthy garden in hot climates. Installing a reliable irrigation system, such as those from Gardena, can be invaluable for pot gardens. While these systems are generally good, it is important to monitor them for potential issues like displaced nozzle heads or depleted timer batteries. The watering frequency should be adapted to the specific plants and climatic conditions; for instance, dahlias benefit from thorough watering about three minutes twice a day.
Finally, to add softness and fill gaps between the main structural plants, several drought-tolerant 'inbetweeners' are suggested. The Mexican daisy (Erigeron karvinskianus) is highly recommended for its continuous bloom from April to November and its ability to thrive in cracks and crevices with minimal water. Perennial geraniums, particularly the bloody cranesbills (Geranium sanguineum) or 'Rozanne', are low-maintenance and drought-resistant options. Scented leaf pelargoniums like 'Attar of Roses' (for fragrance) and 'Aurora' (for continuous flowering) are also excellent choices. Lastly, zinnias, especially the 'Queenie Lime Series', are noted for their ability to flower well even in infrequently watered conditions and are suitable for cutting. These plant selections aim to create a beautiful, wildlife-friendly garden that requires less watering, supporting biodiversity with flowers, birds, butterflies, and bees.
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