hEATWAVE ADVICE

In the First year (planted Winter 25/26)

The root ball is still small. Stick to 20L of water. Reduce the interval between watering from every 7 days to every 5 days.

in the Second year (planted Winter 24/25)

Increase water quantity to 40L. Stick to weekly intervals.

in the Third year (planted Winter 23/24)

By this stage the tree still needs encouragement to fend for itself. If it looks to be struggling, increase the amount of water to at least 40L. Stick to fortnightly intervals.

beyond the third year

It is best to avoid watering trees beyond the third Summer as this hinders proper root establishment. However, if a tree in its fourth year appears to be struggling during prolonged hot and dry conditions you may wish to give it a very deep one-off water to help it through.

too much water?

Watering trees every day is not advised as this does not encourage strong root establishment, and trees need time between deep watering for the soil to aerate. Deep watering at the recommended intervals is better for the tree and it is also important that you conserve your own energy!

Some species, such as Magnolias, Nettle trees and Turkish hazel, are also naturally more drought tolerant. These trees can display symptoms similar to underwatering when they are actually overwatered. In these cases, the usual 20 litres of water is preferable.

Time of day

Watering early in the morning or during the evening is best to prevent water being lost to evaporation before the soil and roots can soak it up.

Add mulch

Bare soil dries out quickly. Covering the tree pit with woodchip mulch helps retain moisture in the soil. Just remember to leave a little space around the base of the trunk so air can circulate.

Share the load and spread the word

Share STfL communications with your local networks. Even better, encourage anyone caring for a tree who isn’t currently registered as an STfL Tree Guardian to get in touch, so they can receive updates and advice directly.

If you’re away for a couple of weeks, consider asking neighbours or friends to help with one-off watering visits.

does a hose pipe ban affect us?

The current Thames Water hosepipe ban does not affect the watering of street trees. However, we do encourage you to collect and re-use your greywater wherever possible.

From the Thames Water guidance:
“Standard trees in urban settings (such as streets) are not covered by the Temporary Use Ban as they do not fall within the definition of being in an area classed as a “garden”, or “domestic or other non-commercial premises” and therefore you can continue to water them with a hosepipe.”

Get in touch!

If you notice anything unusual or concerning despite following our watering guidance, get in touch with us. Every tree is different, and we may be able to help.