The Penny Mac Hydrangea is a gorgeous low-maintenance plant that features beautiful mophead flowers all through summer. These Penny Mac Hydrangeas feature dark green foliage that contrasts the clusters of flowers perfectly. Your flower color depends on your soil! If you have more acidic soil, your flowers will bloom a beautiful blue color. In more alkaline soils, you’ll grow pretty pink flowers. For best results, begin soil treatments well before the Penny Mac Hydrangea flowers in late autumn or early spring.