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Wooden window box buying guide: height, liner, then wood words

Updated: October 2026

A UK windowsill in mid-October is often a short uPVC strip with a pot already on it, and amazon.co.uk mixes soil troughs, shallow trays and vase-ranked boxes in one search. This wooden window box buying guide sets the order before you pay: height and job, then drainage and a liner, then one size line, then where the box will sit, and only then the wood words. Figures are the amazon.co.uk prices and stars held for this set on 15 October 2026. The Products Compared editorial team did not lab-test them. The table is on the [wooden window box comparison](/hub/door-and-window-security/wood-window-box).

A UK windowsill in mid-October is often a short uPVC strip with a pot already on it, and amazon.co.uk mixes soil troughs, shallow trays and vase-ranked boxes in one search.

Our top picks

NUPTIO Nuptio white window boxes

Best overall

NUPTIO Nuptio white window boxes
6.4/10about £19.98
View offer
Hortico Hortico 76 cm window box

Rank 2

Hortico Hortico 76 cm window box
8.8/10about £26.99
View offer
GROWSCAPE Growscape buffalo-brown planter

Alternative

GROWSCAPE Growscape buffalo-brown planter
4.8/10about £13.21
View offer
On this page
  1. 1.What you are actually buying
  2. 2.Height, litres and one size line
  3. 3.Drainage, a liner, and where it will sit
  4. 4.Wood words that are not a durability class

What you are actually buying

Buy the job the listing can do. A result may be a 15 cm soil trough, a shallow tray, a cachepot or a vase. Under about 500 g and about 8 cm high, treat the piece as decorative. That line is a rule of thumb for this folder. Nuptio is the vase example at 8 cm. Tbest, at 110 g, is not a full window box.

Height, litres and one size line

The Garden Centre Association asks for at least 15 cm wide and 20 cm deep. The litre-stated troughs here are 15 cm high, so they miss that depth. The 76 cm Hortico is 24.5 litres at about £26.99. The pair states 14.5 litres on the pair page, at about £38.78. Keep that figure as a pair total. If the title, an attribute and a bullet disagree, leave the spare figures unused. Growscape prints three size lines, including 10 gallons, so its size stays unknown. The best wooden window box page sorts who each listing is for.
NUPTIO Nuptio white window boxes

Testsieger

NUPTIO Nuptio white window boxes
6.4/10about £19.98
View offer

Drainage, a liner, and where it will sit

Both Hortico troughs are slatted, and neither bullet list names a liner. Fitting steps are on the lining page. The 76 cm Hortico is window mount and outdoor. The 51 cm pair is floor standing. Empty weights of 3.5 kg and 6 kg are not a planted load. A uPVC sill is not a beam. Leases and restrictors stay on the balcony and rented flat page.

Wood words that are not a durability class

Pine and Scandinavian redwood are not Use Class 3 or BS 8417. No listing here states that class, or FSC. On the 76 cm Hortico page, Scandinavian redwood means pine. Creosote stays off amateur use under the 2003 regulations. Take the 76 cm box for one outdoor trough if you will line the slats and you accept 15 cm rather than 20 cm of depth. Take the pair for two floor-standing troughs. Both show 4.6 from 100 ratings with the same review text. A qualifying amazon.co.uk purchase can earn a commission at no extra cost to you.

Common questions

How do I tell a wooden window box that can hold compost from a shallow tray or a vase?
Look for about 15 cm of height and a printed litre capacity, then check the base. The Hortico troughs in this set do that. Nuptio, at 8 cm and ranked under vases, is reviewed mostly for dried flowers. Under about 500 g and about 8 cm high, treat the piece as decorative or succulent use. That is a rule of thumb for this folder. Tbest, at 110 g, is not a full window box, and stars on a vase do not show that it will hold compost.
Which size line do I trust when the title, the attribute and the bullet disagree?
Use one line you can measure, and leave the other figures unused. Growscape prints 15.2 × 40.6 × 12.7 cm beside 16 × 6 × 5 cm and 10 gallons, so its outside size stays unknown. Kisangel says carbonised in the title and natural wood in the body. Sections 9 to 11 of the Consumer Rights Act 2015 make the description part of the sale. A clash is a reason to pause, rather than a set of centimetres to average. Ask the seller for a single size first.
Does a slatted pine trough need a liner before I buy compost for it?
A slatted trough needs a liner before compost goes in, unless the bullets already include one. Both Hortico boxes here are slatted and name no liner, so soil falls through the base. You can still choose one when the height suits the sill, provided the liner goes in first. Toddmomy mentions a clear plastic liner only on a special-features line. Fitting that liner is a separate job from choosing the trough.
Is pine, Scandinavian redwood or anti-rotten a durability class?
Those words are not Use Class 3 and not BS 8417. The Wood Protection Association ties Use Class 3 to timber that stays wet outdoors, under BS EN 335 and BS 8417. Ask for the class in writing if you are paying for durability. No box in this folder states it, or FSC. On the 76 cm Hortico listing, Scandinavian redwood and pine are the same timber. A Creocote note in a review is not a recipe, and creosote is off amateur use under the 2003 regulations.
Why is 4.6 from 100 ratings on two Hortico listings not two separate tests?
The 76 cm box and the 51 cm pair both show 4.6 from 100 ratings. The review text held for this folder is the same text, and the same Garden rank line appeared on both URLs. That is one shared write-up, not two groups of buyers. Read the stars once, then judge each listing on length, litres, base and place. The shared score still leaves both bases slatted, with no liner named in the bullets.

Related pages

Plastic trough or wooden window box

Wooden window boxes

Wooden window box on a balcony or in a rented flat

Best wooden window box for compost or table flowers

How to plant a wooden window box without losing soil

How to line a slatted wooden window box for compost

Sources

Public sources used for this comparison. Prices, stars and review counts are amazon.co.uk figures from the listing extracts dated 15 October 2026.

  1. Consumer Rights Act 2015, sections 9 to 11 (retrieved 15 October 2026)
  2. Creosote Regulations 2003 (retrieved 15 October 2026)
  3. HSE biocides overview (retrieved 15 October 2026)
  4. Wood Protection Association, Use Class 3 (retrieved 15 October 2026)
  5. RHS: how to plant up a container (retrieved 15 October 2026)
  6. RHS: roof gardens and balconies (retrieved 15 October 2026)
  7. GOV.UK: how to rent a safe home (retrieved 15 October 2026)
  8. Inveka: drilling into uPVC windows (retrieved 15 October 2026)