Each system is different. My crosses start with L, as John's start with the numeral. He started to go with J but as I use 'L' we decided it was not necessary. My rust colored MTB is : L03-MY-rust. 03 is the year of the cross. M=miniature tall. Y is the cross. rust is the seedling. I would usually use a number for the seedling, but keeping only 4 of them I could use the color. registered name 'Ginger Treat.'
