It is better to use the largest containers that you can, so they will have a grater volume of compost or soil. You can choose from: pots, troughs or growing bags. They also need to be strong and stable. Good drainage is also essential for container grown vegetables. If there are no drainage holes, make several of at least 1 cm diameter in the base of the container, than cover them with crocks to prevent blockage.
The soil or compost must be light and well aerated, since frequent watering will compact it. You can make your own potting mixture by mixing lighten garden soil with well-rotted compost and some coarse sand and peat substitute or peat.
In hot and windy weather containers dry out quickly by evaporation through the top and the sides also if the containers are not made of plastic. To minimize this effect do not put them in exposed sites or at the foot of a hot wall. Line non-plastic containers with plastic sheeting perforated with drainage holes.
It is better to raise plants for containers in modules. Sow cut-and-come-again seedling crops directly in the container. For early crops you can start your containers in a glasshouse, conservatory or porch. If your crops are growing until late in the season in containers and frost is likely to appear, then cover the plants with horticultural fleece and move the containers to a warmer, sheltered place.