A new method developed at the Centre for Plant Biotechnology and Genomics (CBGP UPM-INIA) has shown that, by the contact of a plant with a strain of the Colletotrichum tofieldiae microorganism previously isolated, this plant can increase the number, size or weight of its seeds, fruits and flower. This discovery has been protected by patent, and its implementation could lead to cost savings and to lower environmental impact since this fertilizing system represents an alternative to the mineral fertilizers used so far.