Root Depth: ~12"
https://www.gardeners.com/how-to/video-slideshow-growing-tomatoes/7902.html
http://www.madaboutberries.com/tomatoes/how-to-grow-roma-tomatoes.html
https://www.thespruce.com/growing-organic-tomatoes-indoors-2539817
https://www.thespruce.com/companion-plants-for-tomatoes-1403289