We planted two heirloom tomato plants this season. The black plum tomato plant fared well for the first month and a half yielding a couple dozen delicious golf ball sized tomatoes. The other plant, the orange oxheart, has been growing prolificly; five or six feet in height since Farmer No. 1 bought the seedling from the Green Market. In all that growth, it has only yielded this one single tomato. The plant has flowered over and over, it just didn't take. On his visit, Nick the Farmer looked in disgust when he saw we planted pepper plants in the same area. I was only able to translate the concept that the 'roots no like each other'.