Creating a canning garden in outdoor plant boxes is a fantastic way to grow fresh produce for homemade preserves, even in limited spaces. The best plants for canning are those that thrive in containers and yield abundant harvests. Tomatoes are a top choice, with varieties like Roma and San Marzano being ideal for sauces and salsas. Peppers, both sweet and hot, are excellent for pickling and adding flavor to canned goods. Compact cucumber varieties, such as bush pickles, are perfect for small boxes and make crisp pickles. Green beans, especially bush beans, are easy to grow and can be canned as dilly beans or added to soups. Herbs like basil and dill can also be grown alongside these plants to enhance your canned creations. With proper care and sunlight, these plants will provide a bountiful harvest for your canning needs.