Square Plastic Plant Pots with Drainage Holes – 1L to 30L | Pot King
Square Plastic Plant Pots with Drainage Holes – 1L to 30L | Pot King
🪴 Square plastic plant pots with drainage holes, from 1 litre to 30 litres. Black, sturdy and stackable, for everything from seedlings to patio tomatoes.
The round pot is wasting your space
Put round pots side by side and look at the gaps between them. That dead space is the price of tradition. Square pots sit flush, edge to edge, so the same shelf, tray, windowsill or grow tent holds more plants, and the compost is where the roots are rather than in the corners of your greenhouse bench.
It's one of those quiet upgrades nobody notices until they've tried it. Square pots pack neatly, tip over less and line up properly in trays. Once you've filled a tent with them, round pots start to look like a design flaw.
Perfect for
- Seed sowing and potting on: 1L to 5L pots for seedlings, plug plants and young veg.
- Cuttings and propagation: Matching pots for houseplant cuttings and new plants.
- Grow tents: Square pots make full use of every inch of floor space.
- Patio and greenhouse veg: 11L to 30L pots for tomatoes, chillies, peppers, potatoes and courgettes.
- Houseplant collections: Practical growing pots that sit neatly inside decorative planters.
Key Features
- Square shape: Sits flush with no wasted space between pots.
- Drainage holes: Excess water drains away so roots don't sit wet.
- Stackable: Pots nest inside each other for compact storage.
- Reusable: Wash and reuse season after season.
- Ten sizes: 1, 2, 3, 4, 5, 11, 14, 18, 25 and 30 litres.
Which size?
- 1–2 Litres: Seedlings, plug plants, cuttings and small houseplants.
- 3–5 Litres: Potting on young plants, herbs, strawberries and medium houseplants.
- 11–14 Litres: Peppers, chillies, aubergines and larger houseplants.
- 18–30 Litres: Tomatoes, potatoes, courgettes and statement plants.
🌱 Rose's Pro-Tip: Pot on gradually rather than jumping straight to a big pot. A small plant in a huge pot sits in cold, wet compost its roots can't reach yet. Go up a size or two at a time for stronger, faster roots.
Need more than a handful? Our bulk packs of 10, 20 and 50 work out cheaper per pot.