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Self-watering planter: what to check before you buy

Updated: October 2026

You have a UK kitchen sill or a balcony that only gets water when you are home, and the pots on amazon.co.uk all claim to water themselves. A self-watering planter is a container with a reservoir and a route into the compost, usually a cotton or fabric wick, sometimes a liner and an indicator. A 12 cm six-pack and an 80 cm trough only look alike until you measure the sill and name the plant. The twelve prices are on the [self-watering planter comparison](/hub/plant-accessories/self-watering-planter). Products Compared did not run a laboratory test. A qualifying purchase can earn us a commission at no extra cost to you.

You have a UK kitchen sill or a balcony that only gets water when you are home, and the pots on amazon.co.uk all claim to water themselves.

Our top picks

Lechuza Lechuza BALCONERA Color 80

Best overall

Lechuza Lechuza BALCONERA Color 80
9.2/10about £45.87
View offer
Fayavoo Fayavoo herb boxes, set of 6

Alternative

Fayavoo Fayavoo herb boxes, set of 6
9.2/10about £29.99
View offer
yarlung yarlung 12.7 cm pots, set of 6

Preis-Tipp

yarlung yarlung 12.7 cm pots, set of 6
8.6/10about £16.99
View offer
On this page
  1. 1.What a self-watering planter actually does
  2. 2.Five checks before you compare prices
  3. 3.What the prices in this set are telling you
  4. 4.When the fault is the pot

What a self-watering planter actually does

A self-watering planter still needs you to refill it. The tank holds water under or beside the compost, and a wick or a liner moves that water up. The Royal Horticultural Society treats a built-in reservoir as a method for plants that tolerate steady moisture, and warns that a small tank runs dry and that waterlogged compost rots roots. On the cheaper pots here the path is usually a cotton rope. The Lechuza BALCONERA Color 80 uses a liner and a level indicator, with a 5 litre reservoir and 12 litres of plant volume in the UK catalogue. Amazon’s “12 litres” is that plant volume, not a 12 litre tank. Where the wick sits is on the how to use a self-watering planter page.

Five checks before you compare prices

Start with the job. A 12.5 cm six-pack is not a stand-in for a 25 cm houseplant pot or for a trough about 80 cm long. Next, decide how you will see the water. UK reviewers praise the window on the Fayavoo herb boxes. If the pot will see rain, look for an overflow you can open. A bullet that only says “indoor and outdoor” is not a frost rating. Last, match the plant. Parsley, mint, chives and basil can live with a wick. Rosemary, thyme, cacti, succulents, snake plant and ZZ plant need a dry spell that wick does not give. The windowsill herb planter and the houseplant versus succulent pages take those two decisions.
Lechuza Lechuza BALCONERA Color 80

Testsieger

Lechuza Lechuza BALCONERA Color 80
9.2/10about £45.87
View offer

What the prices in this set are telling you

Shelf prices in this batch run from £12.95 to £45.87. That spread is these twelve listings, not a survey of the UK market. The only listing above £40 is the Lechuza trough at £45.87. Dividing a six-pack by six and comparing it with that trough does not say which is better value, because the jobs differ. JOLANG has no customer-review line in the stored file. INTERWARM is 4.5 from two reviews, both from France. HENTPTD at £12.95 has two UK reviews. This page stops at the checks.

When the fault is the pot

Under the Consumer Rights Act 2015, section 22, you have 30 days to reject goods that are not of satisfactory quality, counting from the day after delivery. A cracked pot, missing parts, or rods that cannot be assembled belong with the seller. A cactus that rots on a wet wick is a planting choice, and the Act is not a refund for that. On the MQJIAZHI trellis bed, UK reviewers say metal rods often do not enter the holes. Ignore the “1.67 cubic metres” line, the Skelang “9.4 centilitres”, the INTERWARM 90 cm height and a 100–120 V line on the Lechuza page. If water from a balcony trough leaks into a flat below, stop and get the railing checked.

Common questions

Do I still have to water a self-watering planter?
Yes. You refill the reservoir instead of soaking the compost every day. The Royal Horticultural Society treats the tank as a store for plants that like steady moisture, and a small store still runs dry in warm weather. A seller’s “up to 14 days” line is not a promise that you can leave the pot for a fortnight.
Is a water window better than a float?
A window shows the level directly. On the Fayavoo boxes, UK reviewers treat that window as easy to read. A float can stick. On the yarlung six-pack, several UK reviews say the indicator shows the wrong level until you shake it. A float is still useful if you are willing to look into the pot when it disagrees with the compost.
What size do I need for a sill versus a balcony?
A kitchen sill in this set is the rectangular box about 27 cm long and 11.5 cm wide, or the Skelang trough at 39.7 cm if the sill is longer. A balcony trough is the Lechuza at about 79 cm, and the brackets are extra. A 25 cm round pot is for one mid-size houseplant on a table, not for a row of supermarket herbs.
Can any indoor-outdoor pot stay out in frost?
No. “Indoor and outdoor” on a bullet is not a frost temperature. Lechuza publishes frost and UV lines for its balcony planters, and those lines do not apply to a budget box in the same comparison. If the listing gives no temperature, keep the pot indoors over winter or treat outdoor use as untested.
What if the pot arrives cracked or the rods do not fit?
You can reject goods that are not of satisfactory quality within 30 days of the day after delivery, under section 22 of the Consumer Rights Act 2015. Rods that will not enter the holes, as UK reviewers describe on the MQJIAZHI trellis bed, are that kind of fault. A plant that dies because the compost stayed wet is not.

Related pages

Best self-watering planter

Self-watering planters

Self-watering pots for houseplants, not succulents

How to use a self-watering planter and its reservoir

Self-watering herb planter for a kitchen windowsill

Sources

Public UK sources used for this comparison, plus the amazon.co.uk listing facts in the display file. Shelf prices and star lines are those UK figures, recorded for this page in October 2026. They are a snapshot, not a promise.

  1. RHS: holiday care for houseplants (retrieved 16 October 2026)
  2. RHS: watering hanging baskets trial (retrieved 16 October 2026)
  3. Garden Organic: make a self-watering container (retrieved 16 October 2026)
  4. Lechuza UK planters assortment catalogue (retrieved 16 October 2026)
  5. Lechuza balcony planter sheet (retrieved 16 October 2026)
  6. Homes & Gardens: what are self-watering planters (retrieved 16 October 2026)
  7. GrowTropicals: do self-watering pots work for houseplants (retrieved 16 October 2026)
  8. Consumer Rights Act 2015, section 22 (retrieved 16 October 2026)