Watering Schedule Planner
Plan watering volume and frequency for a bed or container.
Deep and infrequent beats little and often
Light daily watering wets only the top few centimetres, and roots grow where the water is — so shallow watering produces shallow roots that then depend on being watered every single day. A thorough soak that penetrates to 20–30cm, applied less frequently, pulls roots downward into soil that holds moisture far longer and buffers the plant through hot spells and missed days.
The rough benchmark for established beds in temperate summers is 20–25mm of water per week, delivered in one or two sessions rather than seven. Over a square metre, 25mm is 25 litres — considerably more than most people apply with a watering can and assume is enough.
Check the soil, not the calendar
Any schedule is a starting point that the weather immediately invalidates. The reliable test is your finger: push it a few centimetres into the soil, and if it is dry at that depth, water. Surface appearance is misleading in both directions — a crusted dry surface often sits over damp soil, and mulched beds can look dry while holding plenty of moisture underneath. Wilting in the midday heat is also a poor signal, since many plants wilt to reduce transpiration and recover fully by evening without needing water.
Containers play by different rules
Pots have a limited soil volume, drain freely, and lose water through their sides as well as their surface. In summer heat a container can need daily watering, or twice daily for a small pot in full sun, while a bed a metre away needs nothing. Water until it runs from the drainage holes, which confirms the whole root ball is wetted rather than just the top.
Timing matters at the margins: early morning gives the plant water before the day's demand and lets foliage dry, which reduces disease pressure. Evening watering is acceptable and better than not watering, but leaves stay wet overnight. Mulch reduces evaporation from the soil surface substantially and is usually a bigger win than any adjustment to frequency.
How to use it
- Enter the bed area or container size and select the season and exposure.
- Read the suggested volume per session and the interval between sessions.
- Override the interval based on a finger test rather than the calendar.
- Water containers separately and far more often than beds.
Before you plant
How much water does a bed actually need?
Roughly 20–25mm per week in a temperate summer, which is 20–25 litres per square metre. Delivering it in one or two deep sessions builds far better root systems than watering lightly every day.
How do I know if the soil is dry enough?
Push a finger a few centimetres into the soil. If it is dry at that depth, water. Surface appearance misleads in both directions, and midday wilting is often a heat response rather than a sign of drought.
Should I water in the morning or evening?
Morning is preferable — the plant gets water before the day's demand and foliage dries quickly, which reduces fungal disease. Evening watering works but leaves foliage wet overnight.
Why do my pots dry out so much faster?
A container holds a small soil volume, drains freely, and loses moisture through its sides as well as its surface. In hot weather a small pot in full sun can need watering twice a day while a nearby bed needs none.
Disclaimer: These are general planning estimates. Seed packets, product labels, and regional frost, water, and pesticide guidance always take priority over any figure produced here. Local soil, climate, and variety differences can change the result substantially.