With container gardening, success relies on a few key guidelines. First, balancing the size of a pot with the spread of the plants once fully grown is important, and you also need to ensure that no single plant grows too big to overwhelm the others. When choosing plants, check the labels as these will give you the height and spread the plant will grow to.
Secondly, you’ll also need to pick plants which favour similar growing conditions as they’ll be blooming together in the same soil and sun/shade positions. Unless the plants require special mixtures, a multi-purpose