Thryptomene ericaea is a shrub that typically grows to a height of. Its leaves are narrow elliptic with a pointed tip, about long, wide and sessile. Each flower is on a peduncle long and has a ribbed, more or less cylindricalfloral cup. The flowers have five white, egg-shaped sepals and petals, all about long and there are five stamens opposite the sepals. Flowering occurs from September to December.
A cultivar of T. ericaea known as 'Centenary Starburst' was chosen as South Australia's floral emblem for the Centenary of Federation. This cultivar has commercial potential for the cut flower industry but the species is difficult to propagate. Research on inducing root formation in tissue culture has been conducted.