A Plant has no flowers (PLANT 1)
A1 Plant has flowers with petals white or purple
B Plant has flowers with white petals (PLANT 2)
B1 Plant has flowers with purple petals (PLANT 3)
C Plant has flowers with no petals (PLANT 4)
this works well, just remember you always want to reach a two-way option for the leads. So you will need to add something so that you can arrive at C.
You could add another lead under A1 – plants with flowers, and then change the original A1 lead to B flowers with petals, B1 flowers without petals (plant 4). Under the B lead you would add C plants with purple petals (plant 3), and C1 plants with white petals (plant 2).
I read on another one cones… That was a good addition.