This list from the National Garden Bureau (NGB) rates vegetables based on their total yield per square foot, average value per pound, and length of time in the garden. Crops are rated from 1 to 10, with 10 being the most efficient.
|Tomatoes, grown on supports||9|
|Onions, green bunching||8.2|
|Turnips for greens and roots||7.4|
|Onions, bulbs for storage||6.9|
|Peas, edible podded||6.9|
|Beets, for greens and roots||6.6|
|Cucumbers, grown on supports||6.5|
|Beans, lima (pole type)||6.1|
According to Nona Koivula, former Executive Director of NGB, vegetables have become generally more productive since this rating was established, thanks to breeding improvements (especially in peppers, tomatoes, eggplant, and winter squash). However, it remains a good guide for comparing one crop to another.