Preziosa (Hydrangea macrophylla ‘Preziosa’) Posted on April 11, 2012 by Lucile Whitman Preziosa (Hydrangea macrophylla 'Preziosa') This hydrangea will stay tight and get about 4′ x 4′. The rose-pink florets become darker as the summer progresses until they are almost purple; the stems too are purplish. zone 6 Size: 1 gallon Price: $25.00 Size: Field grown Price: $115.00