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Royal Horticultural Society offers tips on watering your hanging baskets

By Features Reporter

Hanging baskets are being put to the test this summer as the Royal Horticultural Society (RHS) experiments with how best to water them.

The charity's recently recruited garden water scientist Janet Manning will trial 10 different watering techniques over the next three months to determine how you can achieve dazzling blooms with minimum water use.

Hanging baskets, being raised above the ground, are notoriously difficult to water, with much of what is applied running out of the bottom and the exposed root ball losing moisture far quicker than its equivalent in the ground.

Using a small watering can to water a basket. Picture: Tim Sandall/RHS/PA
Using a small watering can to water a basket. Picture: Tim Sandall/RHS/PA

Don't assume that rainwater will do the watering for you, especially with hanging baskets which are often sheltered by overhanging roof guttering or a porch. You'll still need to check them regularly to make sure they're moist enough.

Janet Manning offers five top tips to keep your baskets blooming summer-long.

1. Don't (necessarily) give them a daily soaking

Plants arranged in baskets lose moisture from their roots far quicker than their equivalents in the ground but there's no need to provide them with a daily soaking, says Manning.

RHS research has shown that they can survive on as little as a teacup of water a day – that's just 160ml or 6fl oz – with overwatering likely to lead to poor quality plants.

Maintaining a little bit of moisture is important – if they dry out completely they are really difficult to re-wet. It's like trying to absorb a spill with a really dry mop. It just doesn't work until it's slightly damp. Familiarise yourself with the weight of your basket – if it's feeling light it likely needs watering.

2. Slow down watering

The same RHS research found that water applied 5cm (2in) below the soil surface, through subsurface irrigation with drippers placed through the holes on the side of the containers, increased plant quality even though the upper soil was dust-dry.

A hose spray being used to water a hanging basket. Picture: Hannah Stephenson/PA
A hose spray being used to water a hanging basket. Picture: Hannah Stephenson/PA

If you don't have a subsurface irrigation system, slow down the watering. Pour the water on slowly to give the compost a chance to absorb the water, rather than have it all run off the surface or down the sides of the container. It's easier to use a smaller watering can on hanging baskets as it's lighter to lift.

3. Capture run-off

If you're still inclined to give your baskets more than a glass a day, consider placing pots under your baskets to capture any excess run-off. This also means you will capture the nutrients that would have escaped, so saving on feeding.

4. Go for drought-tolerant plants

Who doesn't love a billowing basket? But covering the soil surface with flowers and foliage can also help prevent the soil being exposed to the sun and drying out. Of course, opting for drought-tolerant plants like succulents will also help you to conserve water and mean you can leave your baskets largely unattended while you are on holiday.

Always opt for a good quality peat-free compost as they will have better water-holding capacity.

Pouring grey water onto flowers. Picture: Tim Sandall/RHS/PA
Pouring grey water onto flowers. Picture: Tim Sandall/RHS/PA

5. Recycle grey water

In times of drought, recycle grey water – that is, leftover water from the kitchen sink, shower and bath – on the garden, always avoiding edibles, to be safe.

To minimise bacterial growth, save grey water for no more than 24 hours and apply it by watering can; grease and fibres can clog irrigation systems.

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