Planting a garden in containers allows you to grow your favorite vegetables without a traditional garden bed. Nearly any vegetable that grows well in the bed can also grow well in a container. Broccoli is one of the earliest vegetables you can plant in your outdoor containers. It reaches maturity in late spring, freeing up the container for other summer vegetables. There are special care considerations you must follow for the broccoli to thrive in containers.
Fill the planting container with a well-draining potting soil. The University of Maine Cooperative extension advises planting one broccoli plant in a 5-gallon pot, or three plants in a 15-gallon container.
Plant the broccoli seedlings into the container at the same depth they are growing at in their nursery pots. Space multiple plants in the same container at equal distances apart.
Water the container with a starter-fertilizer solution, following package application instructions. Water until the excess moisture begins draining from the bottom of the container.
Check the moisture in the soil daily, as containers dry out more quickly than garden beds. Water when the top 1-inch of soil begins to feel dry.
Fertilize the broccoli plants once a week with a soluble, balanced fertilizer. Apply at half the rate recommended on the label.