We recommend a pot that is 1 - 2 cm bigger than the size of the plant pot your plant is currently in. These are pot covers and do not have drainage holes so are not suitable for direct planting.
Sizes:
Small: Suitable for plants in 8/9cm nursery pots with long stems (short plants can be raised by adding a few pebbles to the bottom of the pot).
Medium: Suitable for plants in 11/12cm diameter nursery pots.
Large: Suitable for plants in nursery pots with a maximum diameter of 17cm.