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Flower box with trellis: choose the soil box first

Updated: October 2026

You are standing on a patio, or at the back of a small garden, with a climber in mind and a listing that leads with 140 cm or 180 cm. That number is usually the frame, not the compost. A flower box with trellis is one box and one climbing frame sold together, and the useful first check is how much soil you actually get. The [flower box with trellis comparison](/hub/plant-accessories/flower-box-with-trellis) lines up the ten amazon.co.uk listings in this set, with shelf prices from about £13.99 to £149.99 on 19 October 2026. This page is the buying test before that table: depth, drainage, and whether metal survives the reviews. We did not run a lab trial.

You are standing on a patio, or at the back of a small garden, with a climber in mind and a listing that leads with 140 cm or 180 cm. That number is usually the frame, not the compost.

Our top picks

MYMULIKE MYMULIKE (2-pack)

Best overall

MYMULIKE MYMULIKE (2-pack)
7.2/10about £29.99
View offer
Outsunny Outsunny (wall rack)

Alternative

Outsunny Outsunny (wall rack)
6.9/10about £36
View offer
GiantexUK GiantexUK (180 cm)

Alternative

GiantexUK GiantexUK (180 cm)
6.1/10about £99.59
View offer
On this page
  1. 1.Read the box, then the height
  2. 2.Four types, and what to leave
  3. 3.Drainage, a reservoir, and the word metal
  4. 4.What to count before you pay

Read the box, then the height

Start with the plant, then the interior, then the headline. The Royal Horticultural Society asks for at least a 30 cm pot for a tomato in a container, or about 35–45 cm between plants in a trough, and a cordon still needs a tall support and even moisture. The British Clematis Society asks for a container at least 46 cm across and deep. A 25 cm square tower is the wrong box for a clematis that needs 46 cm of depth. The listings in this set show the trap in plain figures. MYMULIKE states 25 × 25 × 120 cm and a 5 gallon bullet, so the 120 cm is mostly trellis. The GiantexUK unit at about £99.59 is 90 × 45 × 180 cm overall, and the bullets put the soil box at 85 × 39 × 25 cm. JQTOP prints 25 × 147 × 25 cm beside a line of 10 × 10 × 10 cm. Measure the box that arrives against the larger line.

Four types, and what to leave

A plastic self-watering tower is the light option for one or two cordon tomatoes on a patio. Shelf prices here run about £14–£30. Leave this type if you need a wide trough, or if UK reviews of that ASIN already describe a frame that comes apart once the plant is heavy. A wooden trough is the mid band, about £36–£100. Leave the wall rack if you cannot fix it to a wall, and leave the about £44.99 bed if you need a sealed base. Its bullets describe an open bottom. A privacy kit is a screen first. Crevyteg is about £122.88 and GarveeMore is about £149.99, both listed at 25 kg empty. Leave GarveeMore if you are paying for a metal lattice. The only UK review, dated 10 June 2026, says the panels are plastic and only the poles are metal, covered in plastic. Pressure treatment is not stated on these fir listings.
MYMULIKE MYMULIKE (2-pack)

Testsieger

MYMULIKE MYMULIKE (2-pack)
7.2/10about £29.99
View offer

Drainage, a reservoir, and the word metal

The RHS treats drainage holes as essential in a container, because compost stays wetter than open ground and plants in pots need more water, not a swamp. A hole and a reservoir are different parts. A self-watering tower adds a lower well. CHEOAR does not state drainage holes. MYMULIKE does. The long GiantexUK bed drains because the bottom is open, which is right on soil and wrong if you expected a watertight balcony trough. Metal trellis is a title phrase you should test against the bullets and the UK texts. A stainless-steel line on JQTOP, or alloy steel on MYMULIKE, is still a clip-together tower. It is not a welded screen. GiantexUK’s 235 cm planter lists 220 to 240 volts and 50 hertz. The bullets describe fir and a trellis. Ignore the voltage. It is not an electrical product. No British Standard is cited for these boxes. Do not invent one. Count the rods before compost goes in. A short pack is a reason to stop, not a reason to fill the box.

What to count before you pay

Name the plant, then the interior, then whether surplus can leave. A 140–180 cm line is the frame. A 25 cm tower is not a 46 cm clematis tub, and a 16 cm wall rack is not a cordon trough. Treat a reservoir as a well, not as holes, and treat metal in a title as a claim to check.

Common questions

How deep does the soil box need to be for a cordon tomato?
The RHS container note asks for at least a 30 cm pot for a tomato, or about 35–45 cm between plants if you use a trough. A cordon also needs a tall support and even moisture. A 25 cm square tower, such as the MYMULIKE size line, is smaller than that 30 cm guide. You can still grow a compact plant in it, though you should not expect the same root room as a 30 cm pot.
Is a 16 cm wall trough enough?
The Outsunny wall rack is 16 cm deep, with a listed capacity of 3 gallons, three boxes and inner bags. UK reviews mention strawberries and herbs on a fence. The page does not state a maximum plant load. Sixteen centimetres is too shallow for a cordon tomato or for clematis, which the British Clematis Society puts at 46 cm across and deep.
Does metal trellis mean the panels are metal?
Not on every listing in this set. GarveeMore’s only UK review says the panels are plastic and only the poles are metal, covered in plastic. Crevyteg’s bullets say a plastic trellis. Read the material field and one review that names the plastic before you treat the title as the specification.
Why does one listing mention 220–240 V?
GiantexUK’s long fir planter, 235 × 63 × 102 cm, has a field that says 220 to 240 volts and 50 hertz. The bullets describe wood, dovetail panels and a trellis. There is no powered part in that description. Treat the voltage line as a bad field, not as a reason to wire the bed.

Related pages

Flower box with trellis comparison

Best flower box with trellis

Wood or plastic flower box with trellis

Flower box with trellis on a balcony in the UK

How to plant a flower box with trellis in the UK

Sources

Public UK sources used for this page. Shelf prices, stars and review counts are the amazon.co.uk figures captured for these listings, checked on 19 October 2026.

  1. RHS, Growing plants in containers (retrieved 19 October 2026)
  2. RHS, Roof gardens and balconies (retrieved 19 October 2026)
  3. RHS, Tomatoes: grow your own (retrieved 19 October 2026)
  4. RHS, How to plant a climber (retrieved 19 October 2026)
  5. British Clematis Society, growing in containers (retrieved 19 October 2026)
  6. Consumer Rights Act 2015, section 22 (retrieved 19 October 2026)
  7. GOV.UK, General Product Safety Regulations 2005 (retrieved 19 October 2026)
  8. Wilko, Samuel Alexander wooden trellis planter (retrieved 19 October 2026)