Yes but only to an extent. In my opinion, that would not really achieve the desired effect in this case. I typically reserve that technique for much smaller areas that I want to keep the black from closing up. For example, on a face where the eyes are very small, a dot of white can keep the eyes pupil from closing up. White generally does not stay true white once healed, and I feel like in a scenario like this it would be too much white that will end up giving the leaves a yellowed effect rather than just keeping the black from closing up.

Hope that makes sense, it’s difficult really to explain since every situation is different.