Drought-resistant plants: a guide to a Mediterranean garden with no watering

With summers getting longer and longer and water restrictions that come round every year, the garden that gives the fewest problems is the one that doesn't depend on watering to survive. And choosing drought-resistant plants isn't settling for a lesser evil: many of the most beautiful species in a Mediterranean garden — lavenders, rock roses, silvery grasses, shrubby salvias, oleanders — thrive precisely because the summer is dry and the winter mild. A well-made xeriscape isn't a bit of wasteland with four spiky things: it's a structured garden, with staggered flowering and colour all year, that also uses half or a third of the water of a conventional one.

In this guide you'll see how these plants work inside, 30 recommended species classified by function, the complete process for transforming a conventional garden into a low-water one (including how to remove a lawn properly), the soil preparation so it drains, the mulch options compared, the watering they do need during establishment and the annual maintenance. At the end, the frequently asked questions with the most common doubts.

How a drought-resistant plant works

These adaptations almost always go together. Learn to recognise them and you'll be able to choose drought plants yourself at any nursery, even if you don't know them:

• Grey, silvery leaves or leaves covered in fine down: the light colour reflects the radiation and the hairs create a layer of still air that reduces transpiration. Lavender, santolina, Teucrium, Stachys byzantina, Convolvulus cneorum.
• Small, hard, waxy or needle-shaped leaves: less surface through which to lose water and a thick cuticle that seals it. Rosemary, thyme, broom, myrtle, Coronilla.
• Fleshy or succulent leaves: they store water in their tissues for the rainless weeks. Sedum, agave, aloe, Delosperma, Aeonium.
• Deep taproot: many Mediterranean perennials send a main root down 1-2 m and, once established, find moisture that shallow-rooted plants can't reach.
• Summer dormancy: some (Mediterranean bulbs, certain grasses) simply dry off on top in the depths of summer and resprout with the autumn rains. They're not dead, they're sleeping.
• Aromatic essential oils: the scent of the herbs also reduces the leaf temperature and deters herbivores.

No plant is drought-resistant the first year. They all need regular watering during the first 12-18 months to develop a good root system. From then on, most manage on their own except in extreme heatwaves or two dry summers in a row with no rain.

30 plants for a low-water garden

Structural shrubs (the garden's skeleton)

• Rosemary (upright and prostrate forms): evergreen, flowers in winter, aromatic, resists absolutely everything. The most versatile.
• Lavender and lavandin 'Grosso': the classic; the lavandin is bigger, more resistant and gives more flowers to dry.
• Teucrium fruticans: blue-grey foliage and pale blue flowers almost all year; ideal for informal hedges with no watering.
• Cistus (rock rose): spectacular flowering from May in white, pink or purple; prefers poor, stony soil, hates excess water.
• Nerium oleander: flowers all summer under the harshest sun and in any soil. Toxic: be careful with children and pets.
• Myrtle (Myrtus communis): a Mediterranean evergreen shrub, aromatic leaf, white flower in summer, clips well.
• Mastic (Pistacia lentiscus): glossy evergreen leaf, very tough, a good box substitute in a dry climate.
• Phlomis fruticosa: yellow flowers in whorls over velvety grey leaves.
• Shrubby salvia (Salvia microphylla, S. greggii): very long flowering from spring to autumn in red, pink or coral.
• Westringia: similar to rosemary but with a lilac flower, ideal for low coastal hedges.

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Flowering perennials

• Gaura lindheimeri: a cloud of white or pink butterflies from June to October; light and airy.
• Perovskia (Russian sage): blue spikes on silvery stems, takes the reflected heat from a wall without flinching.
• Achillea (yarrow): flat yellow, reddish or white flowers; attracts beneficial insects and dries very well.
• Euphorbia characias and E. rigida: evergreen structure all year and acid-green flowers in spring.
• Salvia nemorosa: violet spikes in May-June, repeats if you cut it.
• Verbena bonariensis: lilac flowers on tall, thin stems you can see through; self-seeds.
• Centranthus ruber (red valerian): colonises walls and cracks, flowers for months, almost indestructible.
• Eryngium (sea holly): spiny metallic flowers, sculptural structure.
• Limonium (statice): clouds of tiny mauve flowers, perfect on the coast.
• Kniphofia (red-hot poker): orange and yellow spikes that take heat and wind.

Grasses and ground covers

• Stipa tenuissima and Stipa gigantea: movement and lightness; the gigantea raises golden flower heads up to 2 m.
• Festuca glauca: compact bluish clumps for the edge or for geometric masses.
• Pennisetum (P. villosum, 'Hameln'): feathery flower heads in late summer.
• Muhlenbergia capillaris: a translucent pink cloud in autumn, spectacular backlit.
• Sedum (several species): carpets dry soils and flowers in late summer when almost nothing else does.
• Delosperma: a carpet of bright fuchsia, yellow or orange flowers over succulent leaves.
• Cerastium tomentosum: a silvery cascade that falls over walls and banks.
• Thymus serpyllum: creeping thyme for slab joints and sunny banks; you can walk on it.
• Dymondia margaretae: a flat grey-silver ground cover, a lawn substitute in low-traffic areas.
• Rosmarinus 'Prostratus': prostrate rosemary for covering large sloping surfaces.

How to design a xeriscape step by step

Step 1. Reduce or remove the lawn

The lawn is by far what uses the most water in a garden: between 4,000 and 8,000 litres per 100 m² in a summer month. Reducing it to the area you actually use (play, seating) and replacing the rest with beds and gravel is the decision that saves the most water. To remove the lawn without herbicide:

1. Cut the lawn very short and water it.
2. Cover it with cardboard with no coloured ink, overlapping the edges well, and on top 10-15 cm of compost, leaf mould or wood chip.
3. Leave it to act for 2-3 months (better in autumn-winter). The lawn dies for lack of light and the cardboard breaks down.
4. You plant straight through, pushing the mulch aside at each hole.

Faster alternative: lift the turf with a spade or a hired turf cutter.

Step 2. Improve the drainage

Here's 80% of the failures with drought plants: they die more from stagnant water in winter than from lack of water in summer. The root rots. If your soil is clay:

• Plant on raised mounds of 20-40 cm, so the crown of the plant is above the water level.
• Add coarse gravel or grit (never fine sand, which with clay makes cement) mixed into the planting area.
• In extreme cases, a small bed of gravel at the bottom of the hole.

Step 3. Group by water need (hydrozoning)

Don't mix a hydrangea (lots of water) with a lavender (no water) in the same bed: you won't be able to water either properly. Put together the plants that ask for the same thing. That way, in summer, you can close off whole irrigation zones and water only the "wet" area (if there is one).

Step 4. Mulch with mineral material

For a xeriscape, gravel or volcanic lapilli are the best option: on top of all their advantages, a 5-7 cm mineral mulch reduces soil evaporation by up to 70%.

Step 5. Watering only for establishment

Install surface drip irrigation with one dripper per plant before planting. Schedule:

• First summer: 1-2 deep waterings a week (soaking 30-40 cm).
• Second summer: 1 watering every 10-15 days, only if there's a heatwave.
• From the third year: close the lines. Occasional emergency watering only in exceptional summers.

Always water a lot and very spaced out: that way the root goes down to look for water. Short, frequent watering does exactly the opposite and creates dependent plants.

Step 6. Plant in autumn

The planting time for a xeriscape is October-November. The plant takes advantage of all the rain and the cool of winter to root and reaches the first summer already established. Planting in spring forces you to water a lot all summer; planting in summer is almost a guarantee of losses.

Step 7. Xeriscape density

In a drought garden, leaving gravel or soil visible between the plants is part of the style, not a defect. It reduces competition for water and gives that scrubland or gravel-garden look. Plant 30-40% less dense than in a conventional garden and let the plants reach their real size.

Annual maintenance of a xeriscape

• Late winter: cut the grasses and dry perennials to the ground. Light trim of the herbs (a third of the green, never the old wood) so they don't open up in the centre.
• Spring: go over the gravel mulch, pull up the weeds that have germinated before they seed.
• Summer: practically nothing. Enjoy it.
• Autumn: plant the new stuff, divide the odd perennial if needed, collect seeds.

An established xeriscape asks for between a third and half the maintenance time of a conventional garden with a lawn.

Notes by climate zone

• Mediterranean coast and south: you can use the whole palette, including the more cold-sensitive ones (bougainvillea, oleander, Aeonium, aloe).
• Inland with hard winters (-8 to -12 °C): stick to the toughest: perovskia, yarrow, sedum, festuca, stipa, lavandin, salvia nemorosa, coneflower. Protect the young rosemaries and oleanders the first years.
• Very windy areas or exposed coast: Tamarix, Elaeagnus, Atriplex, Westringia as a barrier; behind that, the rest.

Calendar for the first and second year

The difference between a xeriscape that thrives and one that's lost is almost all in the management of the first two years.

• Autumn 1 (planting): prepare the soil and drainage, plant, install the drip with one dripper per plant, mulch with gravel leaving the collar free, and water deeply at the moment of planting.
• Winter 1: water only if there's a long dry spell. Check that no plant is "sitting" in a puddle.
• Spring 1: pull weeds, one watering every 10-15 days if it doesn't rain.
• Summer 1: 1-2 deep waterings a week. It's the critical summer: if a plant dries out completely now, it won't resprout.
• Autumn 1 - Spring 2: replace the losses, lightly trim anything that has grown lanky.
• Summer 2: one watering every 12-20 days, only in heatwaves. Many plants no longer need it.
• From the third year: close the drip lines by zones as you see the plants manage on their own. Emergency watering only.

Colour combinations that work

A xeriscape doesn't have to be a monotonous green-grey. Some tried palettes:

• Silver and purple: lavender, Perovskia, Teucrium, Stachys byzantina, salvia nemorosa, allium. Cool and elegant, staggered flowering from May to August.
• Yellow and blue: Euphorbia, Phlomis, yellow Achillea, Coreopsis, with Eryngium and Perovskia as a blue counterpoint.
• Warm and dry (prairie style): golden grasses (Stipa gigantea, Pennisetum), Kniphofia, terracotta Achillea, pink Gaura, sedum. Spectacular backlit at dusk.
• White and green: white Gaura, white Cistus, santolina, Convolvulus cneorum, festuca. Luminous, works very well in a patio.

Repeat two or three species as a "thread" throughout the garden (for example, the lavender and the Stipa) and vary the rest: it gives unity without monotony.

Common mistakes

• Watering little and often. It creates dependent surface roots. Water a lot and spaced out.
• Feeding. Excess nutrients give soft growth, not very drought-resistant and more appealing to pests. These plants want poor soil; feeding them is counterproductive.
• Planting in summer. If there's no alternative, shade the plant for two weeks and water that start daily, but wait for autumn whenever you can.
• Using compacted garden soil in the hole. These plants want a growing medium that drains, not a bowl that holds water around the root.
• Mulching with bark against the collar of the lavender or santolina. It holds moisture and rots the base. Leave 5 cm free around the trunk and use mineral mulch (gravel, lapilli).
• Choosing nursery plants that aren't drought plants just because they're labelled "hardy" or "outdoor". Check the adaptations (grey, small, fleshy leaf; deep root) we described at the start.
• Planting too dense thinking about the conventional garden. In a xeriscape, the visible soil or gravel between plants is part of the style and reduces competition for water.
• Pruning with shears to make shapes. These plants want their natural form; a light annual trim is enough. Severe pruning weakens them and opens them up.

Frequently asked questions

Can I remove all the lawn and put only drought plants?

Yes, it's the essence of the xeriscape. The usual thing is to keep a small area of lawn (a hard-wearing mix, with a high cutting height) only if you need it for children or pets, and replace the rest with beds, herbs and gravel paths.

Do these plants need pruning?

Very little. A light trim of the herbs just after flowering so they don't open up, cut the grasses to the ground in late winter, and remove dry stems. No hard pruning or shaping with shears.

Do they take the cold as well as the heat?

Most Mediterranean plants tolerate frosts of -5 to -8 °C without a problem. For colder areas, choose the species on the list marked as hardy (perovskia, sedum, festuca, stipa, yarrow, salvia nemorosa) and protect oleanders, rosemaries and succulents the first winters.

How much water does a xeriscape really save?

Compared with a conventional garden with a lawn and beds of demanding plants, between 50 and 70% once established. The bulk of the saving comes from removing or reducing the lawn; the rest, from the plants and the mulch.

Do they work for pots and terraces?

Very well. Lavender, rosemary, festuca, sedum, gaura, perovskia, shrubby salvias and Delosperma live for years in a large pot with a growing medium that drains and a single dripper. They take being forgotten for a weekend without flinching; in fact, they suffer sooner from too much watering than too little.

Does the xeriscape have flowers all year or only in spring?

Well planned, it has flowers almost all year: rosemary and Teucrium in winter; rock roses, salvias and euphorbias in spring; lavender, gaura, perovskia and kniphofia in summer; sedum, muhlenbergia and shrubby salvias in autumn. The key is to stagger the flowering when choosing.

Can I combine drought plants with a small pond or wet area?

Yes, as long as you respect the hydrozoning: the wet area with its plants (carex, water iris) clearly separated from the rest, not interspersed. The contrast between a dry gravel area and a water feature works very well visually.

How long does a xeriscape take to look "full"?

With medium-sized plants and autumn planting, two or three seasons. Many of these species grow fast once rooted (rock rose, rosemary, perovskia, grasses). Plant a bit denser at first in the visible areas if you want a quick result, and thin out later.

To take the low-water garden further, with composting, biodiversity and rainwater, see the guide to a sustainable garden step by step.