Each listing denotes the size of the pot the plant was grown in.
The majority of the plants we sell online are grown in a 3.5" pot. That includes all tender succulents and lower light house plants.
Hardy succulents are grown in 4" pots.
We grow our winter hardy cacti from seed and they are very slow growers. They are grown in a 3" square pot.
Select plants such as lithops are grown in 2" pots.