Moderately fast upright growing evergreen shrubs with handsome gray-green pinnately compound foliage and bright yellow pea-like blooms in the spring to early summer Sturt s Senna is easy to grow, low maintenance with low water requirements, making a valuable landscape shrub for low deserts, and inland SoCal gardens. Tolerates heat including reflected heat very well. These Australian native plants prefer some supplemental summer irrigation, and hardly any during the winter months. As with other Senna varieties, prune right after flowering has finished.