Which is not strictly true, of course.
Sure, you can grow lots of sugarcane almost anywhere on the island and plantains and yuca and malanga and all kinds of juicy, tropical fruits ranging from guava to mamey.
But as Fidel Castro has found out over the past five decades, you can’t grow coffee in the lowlands, nor giant pineapples, nor tropical strawberries the size of melons.
And it seems you can’t grow too many potatoes, either.
According to the official Cuban newsagency, Prensa Latina, the potato harvest is in big trouble, which may come as surprise to those of us who did not know there was much of a potato harvest in Cuba. At least not since 1959.
The newsagency says the 2007 harvest will be down by a staggering 30 per cent from the 285,000 tonnes of potatoes collected last year.
The reason? It’s too hot.
According to Eduardo Perez, a Cuban potato specialist quoted by Prensa Latina, the potatoes they are trying to grow in Cuba require temperatures below 17C during the night to be able to grow well.
Unfortunately, Mr Perez says, the past few months have “not been favourable” to the growing of potatoes because temperatures have inevitably been above 20C.
So, it’s adios, potatoes, and back to the drawing board.