Brain Game: Green Thumbs

My job requires that I spend a lot of time indoors, and so my friends tend to do the same. Two cohorts of mine - Edward Carter and Johnny Millikin - decided to try their hands at gardening this year. John has planted rows of onion and pumpkin, while Ed is raising watercress and cabbage.

But taking into mind that both of them are Brain Game fans, why did they choose those particular crops?

Here's the answer.

ANSWER: Edward Carter is raising watercress and cabbage because both his name and his crops are properly typed on a QWERTY keyboard using only the left hand. By contrast, Johnny Millikin has a garden full of onion and pumpkin for the same reason, but with the right hand.