Bigleaf hydrangea Hydrangea 'Dark Angel' Red - Hardy plantWith deep red flowers, the hydrangea 'Dark Angel' (Hydrangea macrophylla) is a wonderful addition to your garden or balcony. The large, red clusters will not disappoint! You can plant the hardy hydrangea all year round, provided temperatures have not dipped below freezing. The flowers bloom from summer to autumn. Pruning is not necessary, unless the bush becomes too large. The hydrangea loves partial shade. Keep the soil moist and give it extra water