Best Drought-Tolerant Plants for South East England Gardens

Why Drought-Tolerant Planting Matters

South East England is the driest part of the UK. Annual rainfall in the Thames Valley around Reading, Maidenhead and Slough averages just 600 to 650mm, less than Jerusalem or Beirut. The Chilterns get slightly more (650 to 750mm) but the free-draining chalk soil means the water runs through fast, leaving plants dry within days of rain.

Climate change is making summers hotter and drier. The 2022, 2023 and 2025 heatwaves saw temperatures over 35 degrees Celsius across Oxfordshire, Buckinghamshire, Berkshire and Bedfordshire, with no rain for 6 to 8 weeks. Gardens with traditional planting schemes (hydrangeas, hostas, rodgersias) needed constant watering just to survive. Gardens with drought-tolerant planting sailed through without irrigation.

Watering lawns and borders is expensive and often restricted during hosepipe bans. Drought-tolerant planting is the long-term solution. It looks good, supports pollinators, and needs a fraction of the water of traditional planting.

Best Drought-Tolerant Herbs

Mediterranean herbs are the most drought-tolerant plants you can grow. They have evolved in hot, dry climates with free-draining soil, exactly the conditions in a Chilterns summer.

• Lavender, the ultimate drought-tolerant plant, silver foliage reflects sun
• Rosemary, evergreen, thrives on chalk, flowers in late winter
• Salvia, long-flowering, aromatic, comes in many colours
• Thyme, low ground cover, plant between paving
• Sage, silvery foliage reflects sun, evergreen

Best Drought-Tolerant Perennials

These perennials come back year after year and cope with dry spells without watering. Plant them in spring so they establish before their first dry summer.

• Verbena bonariensis, tall, airy, butterfly magnet, flowers for months
• Nepeta (catmint), blue flowers, grey foliage, drought-tolerant
• Echinacea, pink daisy flowers, deep tap root
• Rudbeckia, yellow daisy flowers, late summer colour
• Alliums, dramatic spherical flowers in late spring
• Sedum (ice plant), fleshy leaves store water, late flowers for bees
• Eryngium (sea holly), spiky blue flowers, deep roots

Best Drought-Tolerant Grasses

Ornamental grasses are excellent in drought-tolerant gardens. Their deep roots find water far below the surface, and their foliage moves beautifully in the wind.

• Stipa tenuissima, soft, flowing grass, loves dry soil
• Miscanthus, tall, architectural, autumn flowers
• Pennisetum, fountain grass, soft flower heads
• Calamagrostis, feather reed grass, upright habit

Best Drought-Tolerant Shrubs

Shrubs provide the structure of a drought-tolerant garden. Choose evergreen shrubs for year-round interest.

• Photinia, red new growth, evergreen, tough
• Choisya, evergreen, scented, tolerant of drought
• Pittosporum, evergreen structure, good for clipping
• Escallonia, evergreen, flowering, prefers milder areas
• Ceanothus, blue flowers in spring, evergreen
• Buddleja, butterfly magnet, drought-tolerant once established

Tips for Drought-Tolerant Planting

1. Plant in autumn (October to December) so roots establish before summer. Spring planting works but needs more watering.
2. Water regularly for the first season until roots are deep. After that, most drought-tolerant plants need no watering.
3. Mulch annually with bark or compost to retain moisture and suppress weeds.
4. Do not fertilise, drought-tolerant plants prefer poor soil. Rich soil produces soft growth that is vulnerable to drought.
5. Group plants with similar needs, do not mix drought-tolerant with thirsty plants. The thirsty plants will need watering, which will rot the drought-tolerant ones.
6. Plant in drifts of 3, 5 or 7 for impact. Single plants look lost.
7. Use gravel mulch in Mediterranean-style planting. It reflects light, suppresses weeds, and looks the part.

Drought-Tolerant Lawn Alternatives

Lawns are the thirstiest part of most gardens. In a dry Chilterns summer, a lawn needs 25mm of water per week just to stay green. That is 250 litres per 10 square metres per week. Over a 6-week dry spell, that is 1,500 litres per 10 square metres.

If you want to reduce your lawn area, consider replacing it with:

• Drought-tolerant ground cover: thyme, sedum, ajuga
• Gravel planting: Mediterranean herbs and perennials in gravel
• Wildflower meadow: native wildflowers cope with drought once established
• Artificial lawn: no watering, but no wildlife either
• Patio or deck: hard landscaping with drought-tolerant plants in pots

See our chalk soil planting guide and our guide to gravel and permeable surfaces.

Common Mistakes

• Planting in spring and not watering. New plants need regular watering for the first growing season, even drought-tolerant ones.
• Mixing drought-tolerant and thirsty plants. One group will suffer. Group by water needs.
• Fertilising. Rich soil produces soft growth that drought kills. Drought-tolerant plants prefer poor soil.
• Not mulching. Bare soil bakes hard and loses moisture. Mulch is essential.

Frequently Asked Questions

Can I have a drought-tolerant garden in shade?

Yes, but the plant choice is smaller. Try Bergenia, Epimedium, Hellebores, Vinca and Pulmonaria. These tolerate dry shade once established.

How often should I water drought-tolerant plants?

For the first growing season, water weekly from April to September. After that, only water in extreme drought (4 weeks plus with no rain and high temperatures).

Will drought-tolerant plants survive a wet Chilterns winter?

Most will. The key is free-draining soil. On heavy clay, drought-tolerant plants can rot in wet winters. Add grit when planting, or build raised beds.

Get Help with Drought-Tolerant Planting

If you want to convert your garden to drought-tolerant planting in Oxfordshire, Buckinghamshire, Berkshire or Bedfordshire, send us a WhatsApp with photos and we will aim to respond within 12 to 36 hours, Monday to Sunday.

Further Reading

• Best plants for chalk soil
• Best low-maintenance plants
• The 2026/27 Chilterns heatwave guide
• Beyond mulch: gravel and permeable surfaces

Relevant local areas

This advice is particularly relevant to gardens in these areas.

• Amersham - Buckinghamshire
• Ascot - Berkshire
• Aylesbury - Buckinghamshire
• Banbury - Oxfordshire
• Beaconsfield - Buckinghamshire
• Berkhamsted - Buckinghamshire
• Bicester - Oxfordshire
• Buckingham - Buckinghamshire

Sources and citations

This article draws on the following sources. Specific claims are cited inline where relevant.

1. CGM field records (2024-09. Site observations from gardens across Oxfordshire, Buckinghamshire, Berkshire and Bedfordshire.
2. Royal Horticultural Society (2024). RHS Gardening Advice and Plant Finder. Available at rhs.org.uk.
3. Met Office (2024). Regional climate averages, South East England. Available at metoffice.gov.uk.
4. British Geological Survey (2024). Soil parent material data for the Chilterns and Thames Valley. Available at bgs.ac.uk.