There are several types of Hydrangea to consider. The Mop Heads or Hortensia above, the lace caps or other species. They are a rewarding group of plants to grow well but need the right conditions to excel.
Provide Suitable Growing Conditions
Flowering Problems
Other Sources of information
Hydrangeas available from Thompson & Morgan
See Help to change Hydrangea colourHydrangea Hydrangea an enthusiasts site
Amazon for Hydrangea books
Read more on gardenerstips.co.uk