Callistemon: Get a patio standard callistemon tree! Also known as: The 'Bottle Brush' tree from Australia. Flowers: Features crimson-red, brush-like flower spikes from May-July. Scent: Leaves release a delicious lemon scent when crushed. Potted: Arrives in a 4-5 litre container. Variety: A frost hardy evergreen tree, ideal for the patio. Patio Standard Callistemon Tree | Living Social