You'll hear 'an inch a week,' 'twice a week,' and 'every morning.' None of it is wrong, but none of it is a rule either. The only honest answer is: water when the plants need it, and read the soil to know.
Why schedules mislead
A Monday and Thursday schedule works in mild spring and fails the first heat wave or the first cold wet week. Schedules assume average weather, and gardens never have average weather. Instead, water responsively.
The 1-2 rule
- In-ground beds: deep water once or twice a week in normal weather, every 3–4 days in a cool spell.
- Raised beds: every 2–3 days, more often in heat.
- Containers: daily once summer settles, sometimes twice on a 95°F day.
These are starting points, not gospel — adjust with the finger test below.
The finger test (still the best tool)
Push a finger 2 inches into the soil near the plant:
- Wet and cool: wait a day.
- Moist and cool: good, check tomorrow.
- Dry to the second knuckle: water now.
It takes five seconds per bed and beats any moisture meter.
Check the plant, not just the soil
Soil tells you the water that's there; leaves tell you the water the plant is using. Watch for:
- Wilt that perks up at dusk: normal on hot afternoons, no action needed.
- Wilt that's still there in the morning: water now.
- Leaf curl on tomatoes in heat: they're protecting themselves, not dying — water deeply but don't panic.
Heat waves change the math
Above 90°F, water deeply the morning before, mulch heavily, and check containers twice a day. Don't water in the heat of the day to 'cool them down' — leaves burn and you waste most of it to evaporation. If a plant is wilting badly mid-afternoon, shade it, don't drown it.
The best $5 you'll spend
A rain gauge and 2 inches of mulch. The gauge tells you what fell (storms are patchy); the mulch stretches each watering by days. Together they cut your work in half.