The present invention relates to methods for generating polymeric particles which comprise one or more active ingredients. The invention also relates to the use of such polymeric particles as a seed treatment. The present technology provides an improved seed treatment suitable for applying plant propagation materials. The seed treatment of the present technology includes the use of high aspect-ratio particles as a seed treatment. The present technology has been found to have advantageous properties associated with the seed treatment including increased adherence of the formulation to the seed and reduced tendency to dust off.