Duo cherry tree has been grafted with these two lovely cherries and both varieties crop late July-early August: Napoleon Bigarreau - Large yellow fruits with deep red flush. Variks Black - A sweet, dark-skinned cherry. Given that cherries are such a well-loved fruit, it’s surprising that they are not more widely grown in our gardens. Grown on Colt rootstock, giving a very productive tree with good fruit size, but compact growth so it can be grown in a small space, either free-standing or trained against a wall or fence. For planting and growing advice read our cherry-tree-growing-guide.