Woolly Umbrella Helichrysum 1 x 1 Large flat heads of a rather dull yellow top tall, slender white stems in summer. Leaves are grey-green. This groundcover spreads well in sun or bright, dappled shade, but not anywhere as vigorously as H. petiolare. Lovely loose perennial to intermingle in a bed with those of a similar growth habit and requirements. Beautiful in indigenous cottage gardens.