it would appear to have a fine grey spider web all over but no sign of spiders
15 March 2019 03:25 AM
hard to say without heaps more information, however biggest cause of death with Boronia plants is poor drainage/waterlogging and this usually results in quite sudden death. fine webbing could be mites on the plant but you would be seeing a discolouration of the leaves. Suggest take a sample in a sealed bag to a nursery for positive identification.