Pot feet get sold on a claim that does not survive a stopwatch. Lifting a pot 18 mm off a saucer does not make gravity pull harder, and water leaves a soil column because of gravity and a hole in the base.

So I expected to measure nothing. What I got was a 52 second difference on the same pot, same mix, same volume of water. The mechanism is not the one printed on the box.

The Test Setup

Six pots, three materials, two conditions each.

  • Pots: 20 cm plastic nursery pot with 5 drainage holes, 20 cm glazed ceramic with one central 12 mm hole, 20 cm unglazed terracotta with one central 15 mm hole.
  • Mix: 70 percent peat-free multipurpose, 30 percent perlite, settled to the same 1.9 kg wet weight in every pot.
  • Saucers: matching flat plastic saucers, 25 cm across.
  • Water: 1.8 litres poured over 20 seconds through a rose head, room temperature.
  • Conditions: pot flat on the saucer, then the identical pot on three 18 mm ceramic feet.
  • Recorded: seconds until runoff stopped, grams of water left in the saucer at 20 minutes, and whether the mix at the base was still saturated 12 hours later.

Every run happened three times, with the mix dried back to 30 percent of its saturated weight in between. The figures below are medians.

Do Pot Feet Speed Up Drainage?

On two of the three pots, yes, and the size of the gap depends entirely on the base of the pot.

Seconds until runoff stopped:

  • Plastic, 5 holes: 51 s flat, 44 s raised. A 7 second gap.
  • Glazed ceramic, 1 hole: 96 s flat, 44 s raised. A 52 second gap.
  • Terracotta, 1 hole: 78 s flat, 47 s raised.

The plastic pot barely notices, because a nursery pot carries a moulded rim and ribs across the base that hold it a few millimetres clear of any saucer whatever you do. Water always has an exit.

Glazed ceramic is the problem case. Its base is a smooth glazed ring, the plastic saucer is smooth too, and once water films between them surface tension pulls the two together into something close to a seal. That single central hole then has to discharge into a shrinking puddle of trapped water, so the pot burps rather than drains.

Half the marketing claim is right, for the wrong reason. Feet do nothing for drainage through the soil. Feet stop the pot from sealing itself shut against the saucer.

Why Does Standing Water Under the Pot Matter?

Because the bottom 3 cm of mix never dries while the saucer stays full.

Water sitting in the saucer at 20 minutes:

  • Plastic: 210 g flat, 195 g raised.
  • Glazed ceramic: 340 g flat, 300 g raised.

Similar volumes either way, which surprised me. What differs is what that water touches. A pot resting flat has its drainage hole below the waterline, so the mix wicks the water straight back up. Capillary rise in a peat and perlite blend pulled visible moisture 3 to 4 cm up the inside of the pot wall within 15 minutes. Set on 18 mm feet, the hole sat above the water and the column stayed dry.

At the 12 hour check, the flat glazed pot still had saturated mix at the base. The raised one did not.

There is the whole health argument. Roots in permanently saturated mix run short of oxygen, and Pythium and Phytophthora both swim through free water. Lost a Spathiphyllum wallisii or a Ficus lyrata to soft brown roots while watering by the book? The saucer is a likelier culprit than the schedule. Recovery steps are in root rot first aid.

Tipping the saucer out 30 minutes after watering does the same job for nothing. Feet cover the times you forget, which in my flat is most times.

When Pot Feet Do Nothing at All

Four situations where you can skip them.

Plastic nursery pots. That 7 second difference is noise. Ribbed bases already self-clear.

Cachepots with no hole. A decorative outer pot with no drainage is a bucket. What matters is lifting the inner pot inside it, not lifting the bucket. Use 2 cm of clay pebbles or an upturned saucer in the bottom, as covered in cachepot versus drainage pot.

Fabric pots. They drain through the side wall as well as the base, so the seal never forms. They do want feet for a different reason, which is wicking damp onto your furniture.

Deep gravel saucers. A saucer holding 4 cm of pebbles with the pot standing on top is already raised. Adding feet makes the stack tippy.

Where feet genuinely pay for themselves: glazed ceramic, or any handmade pot with a flat unglazed foot ring, standing on a hard flat saucer, especially over wood. Unglazed terracotta on a wooden floor leaves a dark ring in about a week, and 18 mm of air prevents it. If you are drilling your own drainage into a ceramic pot, base geometry matters as much as the hole, and the technique is in drilling drainage holes in ceramic pots.

What to Buy, and the Free Version

Specs that matter, in order.

Height 15 to 25 mm. Below 12 mm, surface tension still bridges the gap on a wet saucer. Above 30 mm the pot turns unstable and the whole thing looks like scaffolding.

Three feet, not four. Three always sit flat. Four rock on any surface that is not dead level, and a rocking 12 kg pot chips its own rim.

A soft contact face. Cork, felt or rubber pads. Bare ceramic scratches a finished floor.

Load rating. A 30 cm pot full of wet mix runs 12 to 18 kg. Cheap resin feet crack under that. Check what you are lifting against the figures in pot sizes explained.

The free version performs as well as anything sold for the job: three wine corks cut to 18 mm, three stacked tile spacers, or three bottle caps turned upside down. I reran the glazed ceramic test on cork and clocked 45 seconds, one second off the ceramic feet. Nobody sees them once the pot is in place.

Frequently Asked Questions

Q: My glazed pot has a hole but water pools on top of the soil instead of draining. Is that a feet problem?

A: No. Water sitting on the surface longer than 30 seconds means the mix has gone hydrophobic or compacted. Bottom-water once to rewet it, then loosen the top 4 cm with a fork. Feet only change what happens below the pot.

Q: Do pot feet help a plant dry out faster overall?

A: A little, and less than you would hope. Airflow under the base lets the bottom 2 cm breathe, which shortened my terracotta drying interval from 9 days to 8. The real gain is that the mix stops being rewet from a full saucer.

Q: Can I stand pot feet directly on carpet?

A: The feet are fine, the saucer is not. Any pot with drainage over carpet needs a rigid waterproof tray at least 5 cm wider than the pot, with the feet inside the tray.

Q: Will cork feet rot?

A: Natural cork in a saucer that gets emptied lasts a year or two before it softens. In a permanently wet saucer it degrades within months and grows mould. Use rubber or glazed ceramic anywhere that stays damp.

Q: How many feet does a 40 cm floor pot need?

A: Three, spaced at 120 degrees, set about 60 percent of the way out from the centre. A fourth in the middle throws away the stability of a tripod.

Pot feet are not a drainage upgrade. They are insurance against a flat glazed base sealing itself to a flat saucer and parking your root ball in 300 g of standing water for a day. On a plastic nursery pot, skip them. On glazed ceramic over a wooden floor, they are among the cheapest fixes going. Get the volume you pour right first with our watering calculator.