Why has my wisteria stopped smelling?
We have a wisteria growing on a South East facing wall which has flowered profusely for the last 20 years. Until 3 years ago it also had a wonderful perfume which filled the garden. For the last 3 years, however, it has had no smell whatsoever, for no apparent reason. Any ideas? Thanks.
Flower fragrance, as well as color is related to adequate plant nutrition, especially micro-nutrients and trace elements. As the plant matures it may be using up nutrient reserves, and also leaching of nutrients occurs with rain and irrigation.
Consider hiring a soil analyst for soil testing and recommendations for mineral and biological amendments based on actual deficiencies found.
The next best thing is to find a complete organic fertilizer with a full range of micros. Kelp meal, volcanic and granite rock dust products and humic substances provice trace minerals.