How to fix over-pruned hydrangeas?
Written by
Paul Reynolds
Reviewed by
Prof. Charles Hartman, Ph.D.Hydrangeas that have been excessively pruned require diligence and careful attention. A well-balanced fertilizer added in the spring will promote root regeneration without an excessive load of nitrogen. I revived a client's bigleaf hydrangea that had been butchered by contractors using a fork, a slow-release 10-10-10 granules, and deep watering once a week the following summer. It flowered in a few isolated spots in year two, but in year three it flowered nicely.
Immediate Interventions
- Apply slow-release 10-10-10 fertilizer at root zone
- Water 1 inch weekly until frost
- Mulch with 3" bark to retain moisture
Bud Protection
- Wrap old wood varieties in burlap below 20°F
- Avoid pruning remaining stems for 2 seasons
- Spray antidesiccant on buds in windy areas
Soil testing is helpful during the recovery phase, to avoid nutrient imbalances. A client brought in an oakleaf hydrangea that had been over-pruned and was showing symptoms of iron deficiency (yellow leaves with green veins). The application of a chelated iron product along with a pine needle mulch helped to improve soil acidity. Conduct annual testing for pH and adjust your soil amendments based on your results. With healthy, dynamic soil, you will be able to grow healthy, resilient plants.
Read the full article: When to Prune Hydrangeas: A Step-by-Step Guide
