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Container Square 18l 30.5 x 30.5 x 30.5cm
The square pot 18 litres (30.5x30.5x30.5cm) is built for growers who want to give their plants extra root volume for maximum yield. This generous format supports larger plants kept in veg for extended periods or trained extensively using techniques such as topping, LST or SCROG. The cube-shaped profile at 30.5 cm on all sides ensures uniform root development and aligns precisely with other pots of the same size in your grow space. Drainage holes are built into the base for efficient water evacuation. Use with the 30.5 cm square saucer. Order at plantandflower.be for fast delivery in Belgium.
Square Pot 18 Litres – High-Capacity Container 30.5x30.5x30.5cm
Some plants simply demand more root space. The 18 litre square pot delivers the volume needed for serious vegetative growth and heavy flowering. With its cube-shaped profile of 30.5 cm on each side, it fits well in larger grow tents and dedicated grow rooms where maximising plant performance is the priority.
Who benefits from the 18 litre pot?
This container size is the choice of growers targeting larger plants, typically 50 to 70 cm tall before flipping to flower, or varieties that naturally develop extensive root networks.
- SCROG growers: training one or two plants across a net to fill the entire canopy area.
- Extended veg cycles: 4 to 6 weeks or more of growth to maximise final harvest weight.
- Organic cultivation: a larger substrate volume supports richer microbial life and more stable, sustained nutrition.
Irrigation management for large containers
With 18 litres of substrate, drying time increases significantly. Adjust your watering schedule accordingly: wait until the top 3-4 cm feel dry before irrigating again. Always use a 30.5 cm square saucer and empty it 15-20 minutes after watering to prevent root rot.
Tent configuration
In a 120x120 cm tent, 9 pots of 30.5 cm width (3x3 grid) fit comfortably. In a 150x150 cm tent, up to 16 pots are feasible. Fewer pots per tent means more lateral growing space per plant, which combined with training techniques can significantly increase individual plant yield. Explore our full range of pots and containers to find your optimal setup.
Order the 18 litre square pot at plantandflower.be with fast delivery across Belgium. The container for growers who think big.
What is the difference between the 11 litre and 18 litre square pot?
The 11 litre pot (25x25x26.5cm) suits medium-sized plants up to approximately 40-45 cm. The 18 litre pot (30.5x30.5x30.5cm) provides roughly 60% more root volume and targets larger plants up to 70 cm or growers running extended veg cycles to maximise harvest weight.
Can the 18 litre square pot be used outdoors?
Absolutely. On a terrace or balcony, 18 litres provides ample volume for seasonal plants, herbs or vegetables. Ensure proper drainage and place the pot on a saucer or raised platform so water can flow freely.
Which saucer fits the 18 litre square pot?
The 30.5x30.5 cm square saucer is sized specifically for this pot. It is sold separately and collects drainage water to keep your growing area clean and dry.
