This is a 'black' cherry tomato that's well worth growing outdoors in the UK. It's sweet and when cooked has a superb rich flavour. However, it's tricky to harvest at the right time so I've written this guide to make it easier. Most tomatoes start green and stay that way for quite a few weeks as they grow towards harvest size. Not this one! It quickly turns from green into a very dark blue/black cherry. An easy mistake is to harvest at this stage. It's still really a green tomato . Here's three pictures of the same (unripe) tomato A casual view Underside shows some green Inside is green and not nice Here's a truly ripe fruit Has a red patch and no green Inside, red and delicious