Amgrow 250 ml Tree and Blackberry Killer is a highly concentrated herbicide used in the control of blackberry, lantana, groundsel, privet, wattles and other woody weeds in the home garden. How to use: Use 20 mL per litre of water for overall spraying of blackberry, camphor and laurel seedlings. 1 litre water. Apply from late spring to early autumn when bushes are actively growing. Wet all foliage and stems thoroughly. Any regrowth and seedlings should be sprayed after hardening. Do not spray blackberries suffering from drought stress. Use 20 – 40 mL per litre of water for gorse, wattles and groundsel bushes. Apply from spring to mid summer when growth is active. Tree and Blackberry killer can also be used in cut stump and basal bark applications. Ingredients: 50 g/L Triclopyr.