What does a garden that is hardly watered look like?
It is a garden of native and closely related plants, planted in autumn, with gravel or mulch instead of lawn and a drip system that runs only in the first two summers and during heat spells. The core is plants used to 500–600 mm of rain a year and a dry summer: olive, lavender, rosemary, santolina, rock rose.
The main decision is made not when choosing plants but on the plan: where the shade falls, where soil stays open, where water runs after a downpour. A good garden is designed together with the water on the plot, not on top of it.
Which plants need no watering on the coast?
Practically without watering, after the first two years, live olive, carob (algarrobo), strawberry tree (madroño), mastic (lentisco), rock rose (jara), lavender, rosemary, santolina, teucrium and phlomis. They grew on Catalan hillsides and drought is normal for them. Agaves and opuntias are added where you want a sculptural accent.
A few points on choice. The Canary Island date palm (Phoenix canariensis) is attacked in Catalonia by the red palm weevil and is not worth the money; plant the dwarf fan palm (Chamaerops humilis, palmito) instead. Pines are not planted next to the house: they burn, and on the coast the pine processionary caterpillar hits them too.
Two planting rules. Plant in autumn, in October or November, so the roots go deep before summer. And water for the first two summers, but rarely and deeply, every week or two, not often and a little: that way the roots go down and the plant later survives without you.
Does a lawn make sense in Catalonia?
A continuous lawn on the coast does not make sense: in summer it needs around 4–6 litres of water per square metre per day, and in a drought its irrigation is simply banned. In a villa used only in summer, grass burns out just when people look at it.
A small patch of lawn is acceptable where it is needed for play or as a green spot beside the terrace, and then drought-tolerant species are chosen: Bermuda grass (Cynodon), zoysia, paspalum. They turn yellow in winter but do not die without water. Keep the area small and place it so its irrigation can be switched off without harming the rest of the garden.
What replaces it: gravel with planted clumps, ground covers such as lippia (Phyla nodiflora) or dichondra, stone paths with grass in the joints, timber decking. They give a soft feel without using water. For children and dogs, compacted fine gravel is more comfortable than it looks.
How is a gravel garden built, and why mulch?
A gravel garden starts with the soil, not the stone. Under the gravel goes a geotextile that lets water through and stops weeds; black plastic is not used because it suffocates roots. A 10–20 mm layer of gravel or chippings goes down 5–8 cm thick. It reduces evaporation, stops rain from breaking up the soil and keeps roots cooler.
Mulch of bark, chipped branches or stone around the plants works the same way. A 5–7 cm layer keeps the soil moist longer and suppresses weeds. It is topped up once a year.
On slopes gravel is combined with terraces and low retaining walls that hold water so it soaks in rather than running onto the neighbour. Drainage and overflow are designed from the start: after the storms of September and October, a hundred millimetres can fall in a day on the coast, and a garden with no outlet washes away.
How do you set up irrigation if you visit once a month?
You need automation that works without you and does not flood the house if a pipe bursts. The base: pressure-compensating drip lines, 2–4 l/h emitters at 33–50 cm spacing, a filter and a pressure regulator at the inlet. Plants are grouped into zones by water need, so a lavender and a fruit tree do not get the same dose.
Control: a controller with an app and a connection that does not depend on home Wi-Fi (over 4G, because Wi-Fi in an empty house sometimes drops). A rain sensor, soil moisture sensors and a flow meter are connected to it. The flow meter, with a master valve, cuts the water if consumption exceeds normal, which is how a burst hose is found. Watering runs at night or early morning.
One more rule: the garden's main tap is closed by a motorised valve when you leave. After the first two years, once plants are established, the allowances are cut several times over. How to organise upkeep of the house while you are away is covered separately.
Can you collect rainwater for the garden?
Yes, and in Catalonia it is among the most justified things you can do. The sum is simple: a 200 m² roof with 500–600 mm of rain yields about 80 m³ of water a year after losses. That is enough for drip irrigation of a small garden if the water is stored in autumn and spring.
The system is made of collected downpipes, an inlet filter, an underground cistern of 10–30 m³ and a pump with a controller that switches to mains water when the cistern is empty. An underground cistern does not heat up or grow algae, and under a terrace or a lawn it takes space nobody misses. It is cheaper to plan it during construction or renovation than to open up the plot later.
Rules. This water is for irrigation, not drinking; connection points are marked and not mixed with the mains without a non-return valve. In earlier droughts, irrigation with rainwater was not covered by the ban on mains water, but check the current rules with the ayuntamiento, and the tank usually has to be shown in the design.
What watering restrictions apply in a drought, and how to design with a margin?
Restrictions are set by the Generalitat in drought phases for specific municipalities. In the last drought, in the exceptionality phase, watering private gardens with mains water was banned; exceptions were allowed to save trees, using drip or a watering can, at night, in minimum volumes. Which phase applies to you is checked on the Generalitat and ayuntamiento sites before planting.
Design so that the garden survives even under the harshest regime. For that the system needs three things: plants that get through summer without water once established; a rainwater cistern as an independent reserve; and a manual scheme that can be switched to limited mode. A tree is worth more than a lawn, and it is watered first.
BCN YARD builds houses with their plots turnkey, including gardens, irrigation and drainage. We run the site in Russian and Spanish, with our own crew and one person responsible; the price comes in the estimate after the visit and measurements.
Frequently asked questions
What does such a garden cost to maintain each year?
Noticeably less than a lawn garden: there is no frequent mowing and little water use. What remains is annual pruning of shrubs, topping up mulch and a check of the irrigation in spring and autumn. The exact figure depends on the area and on whether trees need an arborist.
Will such a garden not look bare and poor?
Not if it is designed in layers: trees, shrubs, grasses, herbs and the texture of stone. Olives, agaves and silvery lavender and santolina give shape and colour all year. For the first two years the garden looks a little sparse while plants grow, and that is normal.
When is the best time to plant?
In autumn, October to November, when the soil is still warm and rain has begun: roots have time to go deep before summer. Spring planting is possible but needs more frequent watering the first summer. In summer, plant only when unavoidable and in shade.