The question you posed, just may depend on if Lady E H, by Austin's performs poorly, or not, on own roots.
(I can't say, as I never grew it, although I bet the answer can be searched for, & found.)
In your relatively mild winter climate, there really may not be any need, for grafted. Unless on its' own roots, results in poor performance.
While some people just don't really care for the "look", of the graft union on a rose.
The size, I noticed for Lady EH, being 4 x 4 ft. at the website. Doesn't seems all that large, if that is possibly a kind of hint. Perhaps, if they only offer it grafted, that may be another clue.
As some from Austin's are offered both grafted, & own root, being of comparable size, when ordered either way.
