There are few things more rewarding than planting and growing your own vegetables. And you don't need a lot of space. Just about any crop that can be grown in the ground can also be grown in containers. Here is a handy guide to selecting the right-sized containers for growing vegetables.
Less challenging crops: carrots, onions, eggplant, radishes, peppers, beans, peas, Swiss chard, squash, cucumbers, tomatoes, eggplants, cabbages, herbs, and salad greens. Don't forget to provide supports for vine crops like peas, beans, cucumbers, and squash.
More challenging crops: corn, melons, and potatoes. These crops need a larger volume of everything: food, water, and space. They can all be grown in containers, but if you're limited by space, they may not be the most cost efficient choices.
Here is a range of minimum container sizes and suggestions for plant spacing. This is a general list. You may find you need more or less space depending on the varieties you choose.
|Vegetable||Suggested Minimum Pot Size||Spacing between plants|
|Beans, green||3-5 gallons; 8-12 inches deep||2-3 inches (provide supports)|
|Beans, lima||3-5 gallons; 8-12 inches deep||2-3 inches (provide supports)|
|Beets||1/2 to 3 gallons; 8-12 inches deep||2-3 inches|
|Broccoli||4-5 gallons||1 plant per container|
|Brussels Sprout||4-5 gallons||1 plant per container|
|Cabbage||4-5 gallon; 8-12 inches deep||12-18 inches between heads|
|Carrots||1 quart to 3 gallons; 8-12 inches deep||2-3 inches|
|Chard, Swiss||1/2 gallon; 8-12 inches deep||4-6 inches|
|Collards||12 inches deep||4-6 inches|
|Corn||21 inches wide, 12-14 inches deep||2-3 plants per container, 6 inches apart|
|Cucumbers||4-5 gallon; 1-3 gal. (dwarf)||14-18 inches (provide supports)|
|Eggplant||3-5 gallon||1 plant per container|
|Horseradish||5 gallon; 24-30 inches deep||1 plant per container|
|Kale||3-5 gallons; 8 inches wide X 8 inches deep||4-6 inches|
|Leaf Lettuce||1/2-3 gallons; 4-6 inches deep||4-6 inches|
|Mustard Greens||3-5 gallons; 8 inches wide X 8 inches deep||4-6 inches|
|Onions, green||1/2 to 3 gallons||2-3 inches|
|Onions, yellow/sweet||5 gallons||3-5 per container|
|Peas||4-5 gallons; 12 inches deep||3-4 inches (provide supports)|
|Peppers||1-3 gallons||1 plant per container|
|Potatoes||1-20 gallons||space plants 6" apart|
|Pumpkins||12 inches deep, 4 foot wide||1 plant per container|
|Radishes||1-3 gallons; 4-6 inches deep||2-3 inches|
|Spinach||3-5 gallons; 8 inches wide X 8 inches deep||4-6 inches|
|Squash, summer||2-4 gallons; 24 inches deep||1-3 plants per container|
|Squash, winter||3-5 gallons; 24 inches deep||1 plant per container|
|Tomatoes, full-sized||4-5 gallons||1 plant per container (support)|
|Tomatoes, cherry||1-3 gallons||1 plant per container (support)|
|Turnips||1/2 to 3 gallons; 10-12 inches deep||3-4 inches|
Wood containers are subject to rot. This can be minimized by lining the insides with plastic or wax, and sealing the outside with a non-toxic water-sealant designed for decks. Avoid containers made from treated wood. They can leach toxic chemicals into the soil that may harm plant roots, or even worse, end up on your dinner table.
Container vegetables need to be watered frequently-sometimes daily. Containers made from terra-cotta (clay), or wood will wick water away from the plant's roots much faster than those made from plastic, so pay even closer attention to watering your veggies when using them.
If in doubt about the container size you should use, bigger is better. Don't forget, small containers will need to be watered and fertilized more frequently because they hold less soil.
Dark colored containers (especially made from plastic) absorb sunlight. This can create a hostile environment for your plant's tender roots. Paint the outside of dark containers a light color so they will reflect heat rather than absorb it.
Water draining from containers can leave marks and stains on concrete and wood. Make sure to catch excess water by placing a saucer or reservoir underneath them.
Large containers filled with moist dirt and growing plants are heavy! Save your back and use a plant caddy to move them from place to place.