You can create new flowers with colors that cannot be achieved regularly! Merge roses in level 7 of the following colors to unlock new, unique roses.
red + white = pink
red + violet = light blue
white + violet = orange
For example, you can merge 2 red roses and 1 white rose or 1 red rose with 2 white roses to cultivate Pink roses. The same formula applies to cultivating light blue or orange roses.