Brussels sprouts can be grown in pots – look for one that is at least 500-600mm, like a half wine barrel. Only grow 1 plant per pot.
Harvest sprouts from the bottom of the stalk when they reach about 2-3cm in diameter.
Do not wash the sprouts before storing them, only right before use.
Protect the plant by mulching with straw or providing a cover if you plan to harvest into the winter.