Answer: Your containers should be at least 18" deep for large plants such as tomatoes and 8 inches deep for annual herbs. The material the containers are made from is really up to you - as long as they have adequate drainage holes, they will be fine. Terra cotta pots heat up faster and water evaporates faster than with plastic or wood. I'd go with terra cotta pots and group them all together to shade them from the sunshine. Terra cotta will drain quickly so you won't have to be concerned about overwatering. Epsom salts won't make your tomatoes as juicy as they would be if you simply kept them well watered while the fruit is forming. Enjoy your garden!
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