I bought a house 3 years ago and have had very little luck getting existing hydrangeas to bloom. I believe they are Endless summer, snowball nikko, and Teller blue lacecap (all macrophylla) plus two unidentified in the attached picture. Plants look great (see attached pic) - advice? All in full or half day sun.. I know not to prune macrophyllas.. Do they need fertilizer?
They can be very finicky. I had gorgeous hydrangeas in WA state where the climate and soil conditions were perfect for them. They like their soil a certain way. You might try a soil test to be certain of the pH since they are heavily mulched.
Fertilize hydrangeas twice during the blooming season with a slow-release fertilizer for hydrangeas or with an organic fertilizer. Fertilize in the spring when the growing season starts and about half way through it.
Flower buds start forming in late fall and can be damaged during hard winters rendering the plant bloom-less. They should be covered during cold winters.
