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Watering bag for newly planted trees in a dry week

Updated: October 2026

The tree went in this spring, or the spring before, and the week has been dry. A watering bag for newly planted trees can deliver a slow soak, though one fill empties in hours. The Royal Horticultural Society describes 40 to 60 litres in a dry week. An urban line is at least 50 litres a week from May to August. Peter F. compiled this on 16 October 2026 from those UK sources and the release times in our comparison, without a lab test. A qualifying purchase can earn a commission at no extra cost to you. Listings are on the [tree watering bag comparison](/hub/garden-watering/tree-watering-bag).

The tree went in this spring, or the spring before, and the week has been dry. A watering bag for newly planted trees can deliver a slow soak, though one fill empties in hours.

Our top picks

baumbad baumbad 75 litre

Best overall

baumbad baumbad 75 litre
9.0/10about £12.97
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baumbad baumbad 100 litre

Rank 2

baumbad baumbad 100 litre
8.3/10about £16.99
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Yosoo Yosoo 10 gallon ring

Rank 3

Yosoo Yosoo 10 gallon ring
2.5/10about £9.69
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On this page
  1. 1.What a dry week asks for
  2. 2.What one fill actually does
  3. 3.Depth, weeds, and too much water
  4. 4.A tree that is not yours

What a dry week asks for

In a dry week a newly planted garden tree needs tens of litres. The RHS methods page puts that at four to six full 10 litre cans, 40 to 60 litres, while the soil is dry. The Woodland Trust’s June 2023 appeal, with the Arboricultural Association, asks for at least 50 litres a week from May to August for three years for new urban trees. The London Tree Officers Association poster uses the same week and says that if a bag is fitted, you fill it. A trees.org.uk note calls that 50 litre week a generalisation. The weekly total and one fill are different clocks.

What one fill actually does

Release times in this comparison sit at about five to 12 hours. The baumbad instructions page associates about nine hours with 75 litres and about 12 hours with 100 litres. A 75 litre fill can cover a 50 litre week in one pour, then the water leaves over those hours. It does not stay until next weekend. If the soil is dry again, you refill. One fill is not a holiday plan. A 10 gallon ring stays a gallon label. This page does not convert it into the 50 litre urban week. The LTOA line “fill the bag” means the bag is the tool once it is fitted. If you are away across a dry spell, ask someone to check the soil.
baumbad baumbad 75 litre

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baumbad baumbad 75 litre
9.0/10about £12.97
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Depth, weeds, and too much water

The RHS asks you to soak to about 20–30 cm and to check with a trowel. Dry soil at that depth means the week’s litres are still due. Moist soil means you skip the fill. A bag that drips for nine hours onto wet clay can waterlog the roots. Slow release does not prevent root rot. Keep a weed-free circle about 1.2 m across. Establishment runs to two or three years, and large specimens may need water for up to three summers. After that, a well-chosen tree usually needs water only in a long dry spell. If you cannot separate drought, waterlogging, honey fungus, and planting depth, ask an arborist or the nursery.

A tree that is not yours

Ask before you fit a bag to a council tree, a highway tree, or a pavement trunk you do not own. The Woodland Trust appeal and the LTOA poster support filling a bag that is already fitted. They are not a licence to strap a sleeve to a street tree. Three years is the usual window. After that, routine weekly fills are for a long dry spell. A temporary use ban still decides the hosepipe, whatever the litre target. That sits on the hosepipe ban page.

Common questions

How many litres does a new tree need in a dry week?
The RHS methods page describes four to six full 10 litre cans in dry weather, 40 to 60 litres. The Woodland Trust and the Arboricultural Association ask for at least 50 litres a week from May to August for three years for new urban trees. A trees.org.uk note calls that week a generalisation. An NHS Forest figure of 10 litres a week is not averaged in here.
Is one 75 litre fill the whole week?
A 75 litre fill can meet a 50 litre week in one pour, then it empties in about nine hours on the baumbad instructions, or within about five to 12 hours in this set. It does not sit there until next weekend. If a trowel shows dry soil afterwards, refill. One fill is not a holiday plan.
How deep should the water go?
The RHS asks for a soak to about 20–30 cm. Check with a trowel. Moist soil at that depth means you can wait. Dry soil means the weekly litres are still due. Water sitting on the surface is a drainage warning. A slow-release bag does not stop root rot if the hole is already waterlogged.
How many years do I keep watering?
Plan on two to three years. The RHS says large specimens may need water for up to three summers, and the urban 50 litre line is also framed as three years. After establishment, a well-chosen tree usually needs water only in a long dry spell.
What about a street tree I do not own?
Ask the council or the owner before you fit a bag. The Woodland Trust and LTOA material supports filling a bag that is already part of aftercare. It does not invite you to water a highway tree on your own. If nobody has asked you to water it, leave it.
Is a 10 gallon ring enough for the 50 litre week?
This page does not convert gallons into litres. A 10 gallon label is not treated as 50 litres, and a 20 gallon label is not treated as 75 litres. Read the printed unit, then compare one fill with the weekly figure. The fill still leaves in hours, so the ring does not store the week until Sunday.
Should I water if the soil is already moist?
If a trowel shows moisture at 20–30 cm, skip the fill. Overwatering rots roots, and a slow drip does not cancel a wet hole. Come back when the slot is dry. Rainwater and washing-up water still count towards the same weekly total.

Related pages

How to use a tree watering bag

Tree watering bag buying guide

Tree watering bag

Best tree watering bag for a single new garden tree

Tree watering bag hosepipe ban and the local notice

Sources

Sources checked for this comparison; last retrieved on 15 October 2026.

  1. RHS, garden watering methods (retrieved 15 October 2026)
  2. RHS, watering (retrieved 15 October 2026)
  3. RHS, establishment of trees and shrubs (retrieved 15 October 2026)
  4. Woodland Trust, water your street trees (retrieved 15 October 2026)
  5. London Tree Officers Association, young tree watering poster (retrieved 15 October 2026)
  6. Water Industry Act 1991, section 76 (retrieved 15 October 2026)
  7. The Tree Council, watering newly planted trees during a hosepipe ban (retrieved 15 October 2026)
  8. South East Water, Sussex hosepipe restrictions (retrieved 15 October 2026)