Bigleaf hydrangea Hydrangea 'Red Angel' RedA colourful shrub that you can enjoy for months on end! The red flowers of the hydrangea 'Red Angel Red' (Hydrangea macrophylla) will brighten up any garden or balcony. 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