Seeds from Leptospermum squarrosum The stature is erect, they tend to grow both in height and in width, giving origin to a rounded shrub. Leptospermum squarrosum is an evergreen; during spring it assumes a pink-white colouring; the adult specimens are medium in size and reach 2.5 m high. These plants don’t fear the cold weather and therefore can be grown in the garden during any time of year. Zones 8-11