Good watering is not about being generous — it is about being precise. The most common mistake in vegetable gardens is watering too much, too often.
Read the soil first
Before watering, push a finger two or three centimetres into the soil near the roots. If it is dry and crumbly, it is time. If it is cool and moist, wait. The surface dries faster than the root zone and will mislead you.
Five principles
Don't water unless the soil asks for it. Roots need oxygen as much as moisture. Waterlogged soil suffocates them. Let the soil tell you.
Water slow and long, not quick and shallow. A slow, steady flow penetrates instead of running off. Slow watering reaches the root zone.
Let roots follow the water down. Plants watered shallowly keep their roots near the surface and suffer in dry spells. Deeper, less frequent watering trains roots to go where moisture lasts.
Never water in full sun. Evapotranspiration — the combined loss from soil and plant surfaces — peaks between 10 a.m. and 4 p.m. Much of what you apply at midday evaporates before it reaches the roots. Morning is best: temperatures are low, and foliage dries through the day, reducing disease.
Use fine drops, not heavy splash. Heavy drops compact the soil surface, especially on clay, forming a crust that repels water rather than absorbing it. A sprinkler, rose head, drip line, or gentle side-watering all work well.
Soil type matters
Sandy soil drains quickly and needs watering more often. Clay holds moisture longer but seals at the surface under heavy irrigation. Adding compost improves water-holding capacity in both — organic matter can hold up to six times its weight in water.
Local conditions
During dry summers, many municipalities restrict outdoor water use when groundwater levels fall. These bans typically cover garden watering too. Check your local authority's website before watering during a dry spell, and consider collecting rainwater in a barrel — it is often the most sustainable option regardless of restrictions.