Why Are My Rose Buds Not Opening
Rose buds that fail to open — a problem called 'balling' — are usually caused by wet weather, thin-petaled varieties, or pest damage. The soft outer petals fuse when soaked and then dried, trapping the bloom inside.
When rose buds form fully but never open, then turn brown and mushy, the cause is usually 'balling.' It happens when developing buds get soaked by rain or heavy dew and then dry quickly in the sun; the outer petals stick together into a papery shell the flower cannot push through. Roses with many thin petals are the most prone.
Improve air circulation with sensible pruning and spacing so buds dry faster, water at the base rather than overhead, and gently peel open a few balled buds to check for thrips, which cause similar damage. In persistently wet climates, choose varieties with fewer, tougher petals.