Q. I have a `Nikko Blue’ hydrangea that is 5 years old. For the past two years, it has had only one bloom. The plant gets seven hours of sun per day and I cut it back to about 6 inches in the fall.

Q: My Nikko Blue hydrangea is about 5 years old. It looks fantastic, but blooms less and less each year. It has lots of healthy leaves, but few flowers. Do you have any suggestions? — Adrienne Laya, ...

Dennis Bostrom loves to try new plants. But when he mail-ordered a blue hydrangea in the mid-1980s for his Cottage Grove garden, little did he know it would eventually change his life. “I’d always ...

Q: I bought a ‘Nikko Blue’ hydrangea that has now turned pink! I put a whole bag of something to turn it back to blue, which it sort of has. Is it rusted iron that you’re supposed to use? A: ...

Color ranks high in our decision to acquire a plant for the garden. We are told repeatedly that structure is the most important element, because flower color, even the color or pattern on foliage, is ...