The harvested flowers are placed in drums containing a solvent provided by the marketing companies. Care should be taken when dealing with solvents as they can be highly flammable. Discuss the harvesting operation and requirements with a suitable processing company well in advance of harvest. There are no clear guidelines on pruning boronia. Mature plants are usually pruned to a height of 25 to 35 cm after harvesting is complete.
Younger plants are sometimes more severely pruned with no noticeable detrimental effect on growth.
Post harvest treatment B. heterophylla stems greater than 60 cm, with 50 to 70 per cent flowers open and no wilting are regarded as first grade stems. Second grade stems are 40 to 60 cm long, with 50 to 70 per cent blooms open, no wilting and no more than 5 per cent curve in the stems. Bunches usually contain 10 stems. For some markets, bunches are sold by weight with a 325 g bunch common. Lengthy delays in re-moving field heat can seriously affect flower quality.