Einstein™ ('Novacleein') Summersweet blooms in July and August, producing 12" white flower spikes. The blooms are fragrant and somewhat curly because of their unusual length. Clethra alnifolia Einstein™ is a compact form of Summersweet, making a good deer resistant shrub groundcover. It gets its name from the curly flower habit, a little wild like Einstein's hair. Introduced by Star Roses in 2015.