Broad spectrum knockdown herbicides can be used post-planting, however the desired species must be shielded from the herbicide. Do not overspray on very hot, cold or windy days. Care should be taken in mixed species plantings. Some grass and broad-leaf selective herbicides have been shown to damage some wattles, melaleucas, sheoaks, pines and eucalypts. Information is limited and the use of herbicides in overspraying mixed species plantings must be on a trial basis.
Some herbicides are very damaging to young seedlings.
From experience, Spray. Seed is probably the worst. Leaching soil movement with residual herbicides, or spray drift can cause damage to non-target plants. Some residual herbicides such as Diuron can leach and kill mature vegetation if contact is made with their root zone. Ally , Brush-off and Oust are also very soluble and will move off the target zone.