This is a truly unique heirloom tomato that is green when ripe, although it will develop a blush colour as it softens further. The key is to feel for ripeness, rather than look. The variety came from Germany but was cultivated in the U.S. by Ruby Arnold in Tennessee. Her relatives always called it Aunt Ruby’s tomato, and the name stuck. When to Plant Zone 1: October–December Zone 2: August–December Zone 3: August–January Zone 4: April–July For zone map CLICK HERE Soil Tomatoes are very nitrogen- hungry, so prepare the soil by integrating nitrogen-rich pea or broad bean plants into your soil as a green manure. Alternatively, mix compost and chook manure through your patch a fortnight prior to planting.