Weather conditions here in Moss Landing, California have been pathetic for the last 3 months or so from a hybridization standpoint—or so I thought, based on a lifetime of what to expect when conditions are pretty consistently cold and rainy. Yet there are countless fat natural seed pods. This is not normal under these conditions. Only explanation I can offer is those heavy doses of phosphorus I put on last year. Perhaps cold, since it hinders the uptake of the phosphorus that is necessary for good seed production, can be overcome with a sufficient abundance of additional phosphorus. And as the abundance of unexpected natural seeds has become apparent over the last few weeks, I have made a few crosses at temperatures as low as the upper 50’s F. Most of these crosses have been successful. This would not have been the case in past years. 
Autumn Blooming Daffodils, Daffodil Types, Fertility, Fertilizing, Growing Daffodils, Hybridizing, Pollination, Science, Weather and Temperature, Winter Blooming Daffodils