In a sample of 380 mithril seeds, one tester found these percentage chances for receiving each flower:
Red:14.6% Purple:14.8% Pink/purple/blue:8.7% Orange:17.2% Yellow:14% Red/blue/yellow:13.8% Blue:14.8% Black:0.7% White:0.7%
In a sample of 500 mithril seeds, one tester found these percentage chances of each flower:
Red: 15.6% Purple: 13.6% Pink/purple/blue - 10.2% Orange - 12% Yellow - 18.4% Red/blue/yellow - 15.4% Blue - 14.8% Black - 0.2% White - <0.2%
Another sample consisting of 1000 seeds got the following results:
Red: 15.4% Purple: 14.6% Pink/Purple/Blue: 8.9% Orange: 15.3% Yellow: 16% Red/Blue/Yellow: 14.7% Blue: 14.8% Black:0.2% White:0.1%