A new and distinct cultivar of Hydrangea macrophylla plant named `PIIHM-I`, characterized by its upright, rounded and spreading growth habit; remontant flowering (reblooming, flowers on new growth); bright pink lacecap inflorescences; dark green, powdery mildew resistant foliage, orange to rich rose-red to red-purple fall color; and pink-red stems.

 
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< Shrub rose plant named `Meizmea`

> Elaeagnus plant named `Viveleg`

> Rose plant named `KORtifhar`

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