Hydrangea macrophylla 'Susannah'Hydrangea macrophylla Susannah Hydrangeas are a shade loving plant that flower through Summer and Autumn. This is an old cultivar that my great grandmother use to grow we are not sure about its original name but we have called it Susannah after her because it is such a special plant. This variety has large mop head blooms that are pink or blue depending on soils and forms a large shrub to 1. 5 meters.