Board Thread:Questions and Answers/@comment-74.179.25.113-20130402164046/@comment-9134334-20130409130559

So, to sum things up:

Highest coins/hour: Impruberries (Upgrapes are second-best)

Lowest coins/food: Impruberries (Buffbeets are second-best)

Lowest coins/hour: Pumpwings (Firapples and Scalypears are second-best)

One important thing to remember is that the coins/hour don't actually mean that the food is more efficient in any way. It just means that you'll be spending money less quickly in order to grow them. However, at the same time, you're taking in much less food.

Hope this helps! :)