The correct rates to apply have not been determined but some growers apply a proprietary trace element mix at label rates annually. Fertiliser can be applied as a solid, as a liquid though the trickle irrigation, or as a combination of the two. Information on preparing liquid fertiliser stock is given in Farmnote No. If applying NPK as a solid fertiliser, do not place too close to the plant as damage and even plant death can occur. Irrigation Irrigation or rainfall is essential for successful establishment and plant growth.
Most growers use drip irrigation - the type of dripper depends on soil type and ground slope.
Boronia requires from 2 to 10 litres per plant each day. The best replacement of evaporation is still to be determined but 100 per cent replacement is suggested. Irrigation may be required at least daily during hot weather on sandy soils, but only every two or three days on heavier soils. Boronia plants do not generally recover from severe water stress. Waterlogging can result in plant death from soil borne diseases.