How to cause change of colors of the foliage? ..observation.. foliages tints (rouge, pink, white and green) on Crateagus(beautiful)(this plant.. 5 years and 2 branches are green near the ground... sowings will have its colors (?)do you know a means of transferring its colors on other RosacÃ©es.. I have an extract of this produit(contamination)(?)... experiments were made. articles published, research projects?, I experienced by contamination.. RosacÃ©es.. and others (syringa.. etc).