You can now buy a plant sold under various names (in Canada it is called Ketchup ‘n’ Fries™) that produces tomatoes and potatoes.
And no, it’s not GMO. Tomatoes and potatoes are from the same family, so are somewhat compatible at the outset. After lots of trial and error the industry has figured out a way to graft the top of a tomato onto the base of a potato. As you can imagine, it’s a bit of a nit picky process which demands that the circumference of both the potato and the tomato stalk be of similar size at the time of grafting. The plants then go through a bonding period before being released for sale. As a result, they don’t come cheap. The plants I stumbled upon yesterday in our local nursery were being sold for $25.99.
By all reports from gardeners who have tried this plant in the past, you can expect modest yields of both tomatoes and potatoes. For the same coin you could easily purchase a bag of two dozen seed potatoes and a packet of at least a dozen tomato seeds. But that’s not the point.
This is a gimmick and a fun one at that. If you are short on space or just want to grow this one for a novelty and can afford to do so, then it could be fun project. Especially if you have children.
It could also be a way of thwarting thieves if you garden in a community space or are subject to garden raids in your front yard. Who would think to pull up a tomato plant to look for potatoes? If you lose all your tomatoes at least you can take comfort in harvesting a few potatoes instead.