Where do They Grow? Hydrangeas hold their own in USDA Hardiness Zones 4 to 9. They do well in acidic as well as alkaline soils. Unlike many flowering shrubs, they tolerate both sun and shade.
When to buy? Like all shrubs, hydrangeas are best planted in spring or fall, when temperatures are mild. Summer planting is never ideal, but with plenty of water and some shade, the plant should power through.
How much care? After planting, maintenance is easy, calling for little more than watering and snipping spent flowers.
Are they Pet-Safe? Keep Fido and Fluffy away. All hydrangeas contain traces of cyanogenic glycosides, toxins that, if ingested, cause gastrointestinal upset in cats and dogs.
What do they cost? A 1-gallon pot goes for $20 to $30, depending on the variety.