Growing Salvias in Pots
You can start the plant in an 8-10 inch container, which will be good enough for 1-2 years. depending on the growth and spread of the plant, keep on re-potting it into one size bigger container than the old one.
When selecting a container type, look for pots made from materials such as plastic, ceramic, or clay. Avoid using metal pots, as these can heat up quickly in the sun and damage the roots of the plant. Make sure the pot has drainage holes in the bottom to allow excess water to drain away, as Salvia plants do not like to be waterlogged.