What is Tudor rose significance?

The Tudor Rose signifies the union of the two previously waring houses of York and Lancaster. One house sported the Red Rose (Lancaster) as its emblem and the other the White Rose (York).

When Henry Tudor (of Lancaster) came to the throne as Henry VII, he married Elizabeth of York and merged the two roses (and the dynastic houses) into one and it became an important heraldic badge during the Tudor era that is still used to this day.

The crowned Tudor Rose (white within the red) with a stalk and leaves is the Royal Badge of England and the uncrowned version is the proclaimed Floral Emblem of England.