How To Care For Dried Hydrangeas. When completely dry usually a couple of weeks store in a dry location out of direct sunlight. It might sound counterintuitive to dry flowers using water but allowing hydrangeas to desiccate slowly helps them hold their color and shape even the stems end up sturdier when dried this way.
Do not overcrowd the vases. If you cut them too soon they shrivel up says Marzec who recommends waiting until late summeror even early fall for late-blooming varietiesto cut your stems. Each bloom needs good air circulation to dry and room to maintain an open form.
There are several other methods to dry hydrangeas that can lead to brighter colors of the dried blooms.
Indeed even the stems are generally sturdier when the blossoms are dried along these lines. This is called the hang and dry method. Their color stays bright for a long time and they hold their shape for years before disintegrating. In fact they can turn to dried flowers right in the vase.