Best Planters & Pots — 18L (2026)
1 planters & pots matching size “18L”, hand-picked from UK Amazon listings.
Not sure which one to pick? Read our Best Planters & Pots UK (2026) guide.
#1 Pick
Keter Medium Rattan Pot, Round Base, 100% Recycled Material, 18L, Chocolate Brown- Plastic
- 18L
£34.80
Pros
- Made from 100% recycled material
- Rattan-effect finish suits most garden styles
- Lightweight compared to genuine rattan or stone
Cons
- Plastic construction can fade slightly over time in strong sun
These 18 litre planters and pots are ideal for growing herbs, bedding plants or smaller vegetables in patios, balconies, and raised beds. Constructed from durable plastic, they offer a robust solution for gardeners seeking a manageable size for their planting needs. The generous volume provides ample space for root development, promoting healthy growth.
Each pot features a simple, practical design with a sturdy base to prevent tipping when filled with soil and plants. They're easy to clean and maintain, making them a reliable choice for both novice and experienced gardeners. These planters are suitable for indoor or outdoor use, adapting well to various gardening environments.
Available in a range of colours – predominantly white and grey – these 18L pots complement any garden setting. Consider using them individually or grouping several together for a more impactful display. Remember to check the manufacturer’s guidelines for optimal planting depth based on the specific plant varieties you intend to grow.
FAQ
What type of soil is best suited for these 18L planters?
A good quality peat-based or compost-based potting mix is recommended. Ensure it's well-draining and contains sufficient nutrients to support healthy plant growth. Avoid using heavy clay soils, as they can compact and restrict root development.
Can I use these pots indoors?
Yes, you can! These planters are suitable for indoor use, particularly for growing herbs or houseplants. However, ensure they’re placed in a bright location to receive adequate sunlight – supplemental grow lights may be beneficial.
Are these planters frost-proof?
While durable, these plastic pots aren't specifically designed for prolonged exposure to freezing temperatures. It's advisable to move them indoors or protect them with insulation during harsh frosts to prevent cracking or damage.
What size plants can I grow in an 18L pot?
You can successfully grow a wide range of plants, including smaller varieties of tomatoes, peppers, strawberries, herbs (such as basil and mint), bedding flowers like pansies and petunias, and even dwarf vegetables.
How do I clean the pots after use?
Simply rinse the pots with water to remove any soil residue. For stubborn dirt, you can use a mild detergent solution, but be sure to rinse thoroughly afterwards to avoid damaging your plants.
Do these planters require drainage holes?
Yes, adequate drainage is crucial to prevent root rot. Most of these pots will already have drainage holes, but if not, consider drilling some at the bottom for proper water runoff.
What’s the best way to add compost to the pot?
Use a potting trowel or scoop to carefully add compost to the top of the soil. Gently mix it in with your hands or a small garden fork, ensuring it's evenly distributed throughout the planting area.
Are these pots suitable for raised beds?
Absolutely! They are perfect for use within raised beds due to their durable plastic construction and manageable size. Their stability makes them ideal for supporting plants in raised bed systems.
What’s the typical lifespan of these 18L planters?
With proper care and maintenance, these plastic pots can last for several years. Regular cleaning and protection from extreme weather conditions will extend their lifespan considerably.
Can I use these pots with self-watering systems?
While possible, it’s best to avoid using them directly with complex self-watering systems as the plastic may not be designed to handle constant water flow. A simple drip irrigation system can be used carefully.