Broad-Leaved Privet (Tree Privet)
Tree Privet is a fast-growing, long-lived species with large leaves, commonly seen in bloom at this time of year. Its small, fragrant, creamy flowers form large clusters that cover the trees, followed by bluish or purplish-black berry-like fruit.
Environmental Impact
Tree Privet produces numerous viable seeds that are widely dispersed. It forms dense, tall stands that outcompete and kill native plants. Highly shade-tolerant, it readily establishes itself under native trees, in hedges, and other shaded areas.
Control Methods
- Manual Removal: Pull or dig out seedlings and leave them on-site to decompose.
- Cut and Paste Treatment: For larger trees, cut the trunk and immediately apply Met Gel Cut ‘n’ Paste to the stump within 15 minutes.
- Drill and Fill Method: Drill downward-sloping holes (10 mm in diameter) into the sapwood at 10 cm intervals around the tree. Immediately fill the holes with metsulfuron-methyl (600 g/kg) at a concentration of 0.5g/L + penetrant.
- Foliar Spray: From spring to autumn, apply metsulfuron-methyl (600 g/kg) at 0.5g/L + penetrant to the foliage.
Follow-up & Restoration
Untreated Privet stumps will resprout, and new seedlings will establish in large numbers after adult trees are cut. Follow up every six months until eradication is complete. Replant with native species such as:
- Trees: Kohekohe (Dysoxylum spectabile)
- Shrubs: Korokio (Corokia cotoneaster)