We moved into a home last year that has 3 Diablo ninebark shrubs in the front (north side) of our house. The largest is blooming profusely but the two closer to the house are not - nary a single bloom. Any suggestions? Pruning isn't an issue.
Are the two next to the house getting as much water and sun as the one that blooms? Making sure they get enough water may help. Giving them some high phosphorus fertilizer for flowering might stimulate the two to bloom.