To grow vegetables in containers, fill pots with a sterile potting mix, add slow-release fertilizer and plant vegetable seedlings in the soil. Place the pots in a sunny location, and water them regularly.
Before choosing the vegetables or pots, decide on a location for the vegetable container garden. Choose a spot with plenty of sunlight and protection from wind. Knowing how much space is available helps you choose the size and shape of containers that fit well. This also helps when choosing vegetables, since some plants, such as tomatoes and peppers, need more space.
When choosing containers, avoid dark colors, which absorb heat and may harm the roots. Choose pots large enough to accommodate the roots of the selected vegetables. A tomato plant needs a much larger container than leaf lettuce. Larger vegetables grow best in 5-gallon or larger pots.
Leave some space at the top of the container when filling it with the prepared growing medium. Potting soil is much lighter than garden soil, making it ideal for container gardens. Dig a hole large enough to accommodate the vegetable seedling's roots. Cover the roots with soil, and press it down gently.
Water the vegetables right after planting. Container gardens need frequent watering because the soil dries out quickly. Check the vegetables at least once per day to see if they need more water. Mixing special soil polymers into the potting mix before planting can help retain water.