But there is a difference between the two cases.

The bullace ideal is in the individual bullace tree.

So, in a sense, is the plum ideal.

But the latter cannot be realised, or even approached, by the individual bullace tree.

It cannot be realised, or even approached, by the bullace species except through a long course of culture and breeding.
Is it the same with Man?
Let us take English rusticity as a particular type of human nature,--the equivalent of bullacehood for the purpose of argument.