Will geographical isolation be a major factor in the speciation of a self-pollinating plant species? Why or why not?

(NO) Geographical isolation is generally considered a major factor in speciation for organisms that rely on cross-pollination or migration to exchange genetic material.
However,in the case of a self-pollinating plant species,the pollen is transferred from the anther to the stigma of the same flower or another flower on the same plant.
Because these plants do not depend on external factors or other individuals for fertilization,geographical isolation does not significantly impact their gene flow or reproductive isolation.
Therefore,geographical isolation will not be a major factor in the speciation of self-pollinating plant species.