A problem with one-off spot spraying, for example, via a four-wheel bike or via a tractor or ute, is that St John’s wort plants are variable in maturity and/or, commonly, some plants are hidden amongst other vegetation. One plant missed this season can be a multitude of plants next year, and seeds are easily spread to form new patches next season. This is a weed that can explode in density, especially in years like the past three with above-average rainfall.
