Cytisus scoparius 'Burkwoodii' is now flowering in my garden, in a beautiful reddy-pink hue. It looks better this year than last, when it looked decidedly fed up. They like it dry and can tolerate very cold temperatures. In some parts of the world Brooms are invasive, costing farmers millions of pounds each year. I think my little specimen is fairly well contained, it hasn't grown much since I planted it three years ago.