Hydrangeas are usually given on the 4th wedding anniversary to symbolise appreciation.

The hydrangea blooming season depends upon the type and cultivar as well as your planting zone. Most new growth hydrangeas put on buds in early summer to bloom in the following spring, summer and early fall seasons. In hot climates, hydrangeas may stop blooming in the heat of summer, but will rebloom in the fall.

There is a myth in Japan that tells the tale of an Emperor, who having angered a woman he loved deeply due to his neglect of her in favour of his work, gifted her with a bunch of blue hydrangeas as a symbol of his deep emotions and gratitude towards her.

Regular hydrangeas bloom once per season, while reblooming varieties produce a second set of flowers later in the season on new stems. For hydrangeas, deadheading is about making the shrubs look neater, and focusing plant growth on roots and leaves instead of seeds.