First observe the garden, not the controller
Before touching the timer, walk the garden a day after watering. Lift a hoe a few centimetres in several areas and check whether the soil is damp at depth or only on the surface. In a seasonal home it is easy to mistake a patch of water under a sprinkler for effective watering.
Note which plants show drooping leaves in mid-afternoon (this may be passing heat), which have yellow leaves at the base and which show cracked earth. In Sotogrande and much of the Costa del Sol, a hedge facing midday sun may need more than a shaded area a few metres away. That difference should be reflected in the design of the zones.
- Walk the garden early in the morning and at dusk to compare the state of the vegetation.
- Do not water that same day if the soil is already damp a hand-span deep.
Check sprinklers and drippers before adjusting
A reduced programme on a system with leaks does not save water: it loses it at a specific point. Check each zone and correct tilted sprinklers, blocked nozzles and disconnected drippers. A sprinkler that throws water onto a pavement or a wall wastes much of what it contributes to the soil.
If you have a controller with independent zones, use the opportunity to separate high-need plants, such as lawn in full use or young hedges, from established Mediterranean species that tolerate longer intervals. This separation is the measure that most reduces dependence on manual adjustments in a home that is rarely visited.
Adjust flow and frequency to the season
In autumn it is better to lengthen the interval between waterings than to reduce the duration of each one. Deep, spaced watering encourages deeper roots and a more resilient plant; several short waterings leave the soil damp only in the surface layer. As a practical reference, in many coastal areas lawn watering is spaced out and reduced, while potted plants, with little soil volume, still need more frequent checks.
There is no universal number of minutes. A clay soil takes time to absorb water and holds more; a sandy one drains quickly and calls for more moderate, frequent watering. Observe the response over two or three weeks before fixing a programme for your absence.
- Run a test watering and measure how many centimetres the water penetrates with a rod.
- In pots, group those with similar needs so you do not waterlog the more sensitive ones.
Leave the system ready for absence
If you are going to close the house for several weeks, check the timer, the backup battery and the filter. A dirty filter reduces pressure and can leave the most distant zones without water, precisely those you cannot see from the window. Also check that hoses and connections are not left in areas where water collects or where someone could trip.
It is worth having a trusted person make a brief visit: check that the controller is working, that there are no visible leaks and that the most sensitive plants are not showing signs of stress. The point is not for them to decide on major changes, but to give warning in time.
Common mistakes when leaving irrigation in autumn
The most common mistake is keeping the summer programme because the garden 'has always been like this'. Another frequent one is switching irrigation off completely after the first rains: an autumn shower may wet only the surface and not compensate for weeks of dryness. Shaded areas or established Mediterranean plants are also often overwatered, although they usually tolerate long intervals well.
Another mistake is trusting everything to automation without checking actual coverage. A badly aimed sprinkler can keep one area damp and leave another dry, and the owner only discovers it on returning. Inland, with colder nights, evening watering can prolong surface dampness and encourage problems in sensitive plants, so morning watering is preferable.
Plan by zones and by type of plant
Divide the garden into three groups: lawn and demanding plants, Mediterranean shrubs and aromatic herbs, and pots or newly installed plants. Each group needs a different approach. Aromatic herbs and many Mediterranean shrubs prefer less water and good drainage; pots depend on the soil's capacity and on the wind.
In a second home, the priority is stability: slightly more moderate but regular watering usually gives better results than alternating drought and waterlogging. If the garden has been designed with adapted species and drip irrigation in sensitive areas, the owner depends less on daily supervision. In the context of Gardening in Algeciras and gardening in Sotogrande, the key is to adapt the system to the local climate and to absences, not to water more.