Plant pot sizes - 9cm and 3 litres - or apples and pears.........
Plant Pot Sizes: The Complete Guide - Gardening Tips, Advice and Inspiration
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Elixir Gardens Round Black Plastic Garden Plant/Shrub/Flower Pots with Reinforced Rim | Various sizes (1 to 60 litres) & various quantities available (from 2 to 1000) 4L x 2 : Amazon.co.uk: Garden