Is it better to water vegetables in the morning or evening?

Early morning is best. The soil is cool, so less evaporates, and foliage dries through the day which limits mildew and slug damage. Evening is second best. Midday watering wastes the most water.

How do I know if I've watered enough?

Push a finger into the soil 5cm down an hour later. If it's dry, you've wetted the surface and nothing else — a common mistake. Beds want a slow, deep soak, not a quick pass with a hose.

Should I water every day?

Rarely. Most crops do better with fewer, deeper waterings that pull roots downwards. The exceptions are containers, salad leaves and anything fruiting in a heatwave.

Grow guide

How often to water vegetables.

Every crop has a fortnight that decides its harvest. Miss water then and no amount of attention later fixes it. Here's the chart, by crop.

UK watering frequency and volume by vegetable crop
Crop	Frequency	How much	Critical window
TomatoesErratic watering splits fruit and causes blossom end rot.	Daily in heat	2–3L per plant	Flowering to fruit swell
CourgettesWater the soil, never the crown — rot sets in fast.	Every 2 days	5L per plant	Once fruiting starts
Runner beansDry roots at flowering means no pods set at all.	Every 2 days	10L per m²	From first flower
Lettuce & saladShallow roots. Dryness triggers bolting and bitterness.	Daily	1–2L per m²	Whole life
PotatoesHeavy, infrequent watering beats daily sprinkles.	Weekly soak	20L per m²	Tuber formation
Carrots & parsnipsSudden water after drought splits the roots.	Every 5–7 days	10L per m²	Early growth
Onions & garlicStop watering entirely a few weeks before harvest.	Every 7–10 days	8L per m²	Bulb swell
PeasMulch deeply — peas hate hot dry roots.	Every 3 days	10L per m²	Flowering and podding
BrassicasA generous soak at planting beats weeks of sprinkles.	Every 3–4 days	12L per m²	After transplanting
StrawberriesKeep water off the fruit to avoid grey mould.	Every 2 days	1L per plant	Fruit swelling
SweetcornDeep watering only; the roots go further than you think.	Every 3 days	12L per m²	Tasselling onwards
Herbs (Mediterranean)Overwatering ruins the flavour and rots the roots.	Weekly at most	5L per m²	Establishment only

The case for automating it

Read that chart again and notice the problem: it needs you at home, with a can, most days of August. A dripline on a tap computer delivers precise volumes at dawn, whether you're there or not — and stays permitted through most hosepipe bans.

Get the £25 Flow Kit Calculate your litres

Common questions

Is it better to water vegetables in the morning or evening?: Early morning is best. The soil is cool, so less evaporates, and foliage dries through the day which limits mildew and slug damage. Evening is second best. Midday watering wastes the most water.
How do I know if I've watered enough?: Push a finger into the soil 5cm down an hour later. If it's dry, you've wetted the surface and nothing else — a common mistake. Beds want a slow, deep soak, not a quick pass with a hose.
Should I water every day?: Rarely. Most crops do better with fewer, deeper waterings that pull roots downwards. The exceptions are containers, salad leaves and anything fruiting in a heatwave.