Privets are one of the largest single crops in Danish nursery production, used for hedges and full-size hedges. In recent years, increasing problems have been seen in the production of privet, partly in the propagation phase with significantly decreasing rooting percentages at some producers and partly in the growth phase, where there is a significantly increased flowering formation in privet plants with special challenges in full size hedge production, which results in significantly lower growth and negatively affects shape formation. The strong flowering also affects further growth as a hedge among consumers, who may experience less success with privet hedges in general.

The purpose of the project is twofold, 1) partly to investigate and understand the cause of rooting problems and ensure new methods for better rooting of main varieties and 2) partly to investigate what determines the heavy flowering in production and how it can be avoided or inhibited and thus ensure that heavy flowering does not inhibit growth.

Project period: 01-01-2025 til 31-12-2025

This project is the first year of a two-year project, each year will be completed separately.

• The project is led and carried out by the Department of Food, but with external assistance from 3 nurseries and HortiAdvice.
• The project is carried out in two parts, one on flowering problems and one on propagation problems, experiments are carried out both at AU FOOD and in the Nurseries.