A new and distinct Hydrangea plant having a strong root system, good stem quality and deep pink coloured inflorescences.  `Horstol` is similar to another Hydrangea variety, `Merrits Supreme`, in colour and because they are both mopheads. However, `Horstol` differs from `Merrits Supreme` in growth habit, branching characteristics and forcing time.

USPatent PP21274, September 7, 2010

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