Hydrangea Aspera Rocklon. Large pink clouds of buds and pinkish bronze, slender leaf is just like fine sandpaper with a dark green top and pale green underside. Rocklon is a fantastic foliage plant for contrasting colour and texture This plant grows more upright and has super-sized mauve lace caps ringed by white bracts. Adequate water and bright shade will ensure 'Rocklon's prosperity, to reach 3 metres.