The most reliable drought tolerant plants for UK gardens are Mediterranean shrubs (Lavandula angustifolia, Rosmarinus officinalis, Cistus × purpureus), ornamental grasses (Stipa tenuissima, Stipa gigantea) and tough perennials (Echinacea purpurea, Sedum ‘Herbstfreude’, Verbena bonariensis, Perovskia). Choose plants matched to your soil, mulch with gravel or grit, and water deeply for the first year while roots establish.
That’s the short version. The longer version — which named plants to pick, how to prepare the ground, and why Beth Chatto’s gravel garden has not been watered for 30 years — is what the rest of this guide covers.
Why Drought Tolerance Matters (More Than It Used To)
UK summers are getting drier. Six of the ten driest summers on record have been in the last twenty years. Hosepipe bans, once rare, are now routine in the south-east — Surrey, Sussex and Hampshire all saw restrictions in 2022 and again in 2025.
At the same time, mains water is increasingly expensive, and the sustainability case for watering a garden that could thrive without it gets harder to defend every year.
The answer is not to stop planting. The answer is to plant differently — with species that have evolved to cope with sun, thin soil and long dry periods. Done well, a drought tolerant garden looks richer, not sparser. Think silver foliage, tall grasses moving in wind, lavender clouds humming with bees and long-flowering perennials that keep going from June to October.
The Beth Chatto Gravel Garden (The Credibility Anchor)
In 1992 the late Beth Chatto planted a former car park at her Essex nursery on gravel and sand, facing south, baked all summer. She vowed not to water it once it was established.
More than thirty years later the Beth Chatto Gravel Garden is still going — a dense, layered, beautiful planting of sun-loving perennials, grasses and shrubs that has never seen an irrigation pipe. It is the single most important demonstration in UK horticulture that drought tolerant gardening works. Every plant list below draws on the species she proved in that bed.
The method in one line: right plant, right place, good drainage, deep watering in year one, then trust the plant.
Prepare the Soil Before You Plant
Drought tolerant plants do not mean plant-and-forget. The first year is the making of them. Get the ground right and you buy yourself decades of low-maintenance planting.
Drainage is everything. Most drought lovers come from thin, stony, free-draining Mediterranean soils. In a UK garden they usually die not from summer drought but from winter wet around the crown. If you are on clay or any heavy soil, lift the bed or work in serious amounts of horticultural grit — 30 to 50 per cent by volume, into the top 40cm.
A gravel or stone mulch. Two to three inches (5–7cm) of pea shingle or 10mm gravel laid over the soil keeps the crown dry, suppresses weeds, reduces evaporation and looks right with Mediterranean planting.
Mycorrhizal fungi at planting. A pinch of mycorrhizal inoculant on the root ball at planting helps the plant form the fungal partnerships that extend its root reach and water uptake. Worth doing.
Deep, infrequent watering in year one. A long slow soak once a week is far better than a daily splash. You are training the roots to go down, not to sit at the surface.
Mediterranean Shrubs (The Backbone)
These are the plants most UK gardeners think of first — and with good reason. All prefer full sun and sharp drainage.
- Lavandula angustifolia (English lavender) — the classic. ‘Hidcote’ and ‘Munstead’ are the most reliable for UK conditions. Prune immediately after flowering.
- Rosmarinus officinalis (rosemary) — evergreen, edible, loved by bees in February–March. Upright varieties for structure; prostrate forms for tumbling over walls.
- Santolina chamaecyparissus (cotton lavender) — tight silver domes, yellow button flowers in July. Needs a hard prune in spring to stay compact.
- Cistus × purpureus (rock rose) — papery pink flowers that last a morning each, but replaced daily for six weeks. Short-lived but spectacular.
- Phlomis fruticosa (Jerusalem sage) — grey-green felted leaves, tiered yellow flowers, architectural seed heads that stand all winter.
- Teucrium fruticans (shrubby germander) — silver foliage, sky-blue flowers, one of the best plants for a sunny clipped evergreen.
Ornamental Grasses (The Movement)
Grasses bring the magic — tall, fine, responsive to light and wind. All the species below are reliably drought tolerant once established.
- Stipa tenuissima (Mexican feather grass) — waist-high, silky, rolls like hair in the wind. Looks extraordinary in drifts.
- Stipa gigantea (giant feather grass) — 2m wands of golden oat-like flowers. One of the best specimen grasses for a dry garden.
- Pennisetum alopecuroides (fountain grass) — soft bottlebrush flowers late summer into autumn.
- Panicum virgatum (switch grass) — upright airy panicles; cultivars like ‘Heavy Metal’ and ‘Shenandoah’ add colour.
- Festuca glauca (blue fescue) — low blue cushions for the front of a gravel bed.
Perennials That Cope With Dry Summers
Most of the long-flowering perennials in a modern prairie-style border are drought tolerant. The ones we come back to again and again:
- Echinacea purpurea (coneflower) — upright, long-flowering, loved by bees.
- Achillea ‘Moonshine’ (yarrow) — flat yellow plates above ferny silver foliage. Drought-proof.
- Euphorbia characias (Mediterranean spurge) — architectural, evergreen, lime flowers in spring.
- Sedum ‘Herbstfreude’ (now Hylotelephium ‘Herbstfreude’) (ice plant) — succulent foliage, pink-to-russet autumn flowers that feed late bees.
- Salvia yangii (formerly Perovskia ‘Blue Spire’) (Russian sage) — smoky blue haze, silver stems, smells of hot Provencal hillside.
- Verbena bonariensis — tall, see-through, drifts of purple. Self-seeds gently in gravel — a feature, not a problem.
- Nepeta ‘Walker’s Low’ (catmint) — soft blue-purple mound, flowers for months if you shear it after the first flush.
- Agastache — vertical spires in purple or orange; hummingbird-loved in the US, bumblebee-loved here.
- Eryngium (sea holly) — metallic steel-blue flowers; needs perfect drainage.
Trees For Dry Sites
Trees are harder than shrubs for drought planting — they need the water of year one more than anything. Once established, these cope with long dry spells.
- Olea europaea (olive) — survives outside in sheltered Surrey and Sussex gardens on free-draining soil. Needs a south-facing wall or a warm corner. Can be lost in a harsh wet winter.
- Albizia julibrissin (silk tree) — ferny foliage and powder-puff pink flowers. Late into leaf. Beautiful in a sunny, sheltered courtyard.
- Cercis siliquastrum (Judas tree) — pink pea flowers direct from bare stems in spring, heart-shaped leaves after. Tough once established.
Ground Cover For Gravel
The unsung heroes. These knit gravel beds together, take foot traffic and throw up sheets of flower in summer.
- Thymus serpyllum (creeping thyme) — mats of fragrant foliage, pink flowers humming with bees.
- Sedum acre (biting stonecrop) — succulent yellow carpet for the driest, poorest ground.
- Cerastium tomentosum (snow-in-summer) — silver leaves, white flowers; vigorous — give it space.
The Surrey Angle: Chalk Downs vs. Wealden Clay
Where you are in Surrey makes a real difference.
The North Downs (Guildford, Dorking, Reigate ridge) sit on chalk. Thin, free-draining, alkaline soil — effectively a natural Mediterranean substrate. Lavender, rosemary, Cistus and Phlomis thrive here with almost no soil preparation. This is some of the best drought-planting country in the UK.
The Low Weald (Mole Valley floor, Horsham, Crawley, much of Sussex) sits on heavy Wealden clay. It holds water in winter and bakes hard in summer — a tough combination. Clay gardens can be planted with drought tolerant species, but only after serious drainage improvement, or by building raised beds or gravel gardens on top of the native soil.
If you are unsure which you are on, a spade test tells you in thirty seconds. We go into depth on clay-friendly planting in our guide to the best plants for clay soil.
First-Year Watering (The Part Most Gardeners Skip)
Even drought tolerant plants need water in year one. This is the single most common reason new Mediterranean borders fail.
The schedule we use:
- Planting day: water in heavily — a full watering can per plant.
- Weeks 1–4: a long soak twice a week if it hasn’t rained.
- Months 2–6: one deep soak a week in dry weather.
- Year two onwards: only water in extreme drought, if at all.
The point is to encourage roots to reach down for water, not sit waiting at the surface. Shallow daily watering produces shallow, drought-prone plants.
A Few Honest Warnings
Drought tolerant planting is not maintenance-free. It is different maintenance — less mowing and watering, more pruning, staking of grasses, edging of gravel, and pulling up of self-seeders. If you let it run, it looks wild; if you groom it twice a year, it looks extraordinary.
Most of these plants also hate being crowded. Space generously at planting — they will fill the gaps by year three.
For ongoing care of this kind of planting, we offer year-round garden maintenance across Surrey including the right-time pruning that keeps Mediterranean gardens looking their best.
Frequently Asked Questions
What is the most drought tolerant plant?
Sedums and houseleeks (Sempervivum) are among the toughest — they store water in succulent leaves and can survive months without rain. For flowering impact, lavender (Lavandula angustifolia) and Russian sage (Salvia yangii) are the most drought-proof choices for UK gardens.
How long do drought tolerant plants need water?
For the first full year after planting. Water deeply once or twice a week from spring through to autumn in year one, reducing gradually through year two. From year three onwards, most established drought tolerant plants need no watering at all except in extreme drought.
Can drought tolerant plants grow in clay soil?
Not usually without help. Most drought tolerant plants come from free-draining Mediterranean soils and rot in winter on wet clay. You can grow them on clay by improving drainage heavily with grit (30–50 per cent by volume), planting on a slight mound, and using a gravel mulch — or by building a raised gravel garden on top of the clay.
What are the best drought tolerant flowering plants?
For long flowering with real drought tolerance: Verbena bonariensis, Echinacea purpurea, Nepeta ‘Walker’s Low’, Salvia yangii, Perovskia, Achillea, Sedum ‘Herbstfreude’ and Lavandula angustifolia. Between them they cover May to October with barely any watering once established.
Do drought tolerant plants need any water?
In year one, yes — deep watering once or twice a week. From year two, most need no water at all in a normal UK summer. Only in extreme drought (six weeks or more without rain) should you consider a single deep soak.
Are drought tolerant gardens low maintenance?
Lower than a lawn or a traditional border, but not zero. Expect one hard prune a year for Mediterranean shrubs, a spring cut-back for grasses, and a gravel top-up every few years. In exchange you save on watering, feeding and most weeding.
Planning a Drought Tolerant Garden in Surrey or Sussex?
We design and build drought tolerant gardens across Surrey, Sussex and the South East — from gravel gardens in the Downs to Mediterranean-style courtyards in Dorking, Reigate and Horsham. Every scheme is matched to the soil, aspect and microclimate of the site, and planted with species that will still be thriving in twenty years.
