Marechal Niel can be picky, sometimes thriving on its own roots and sometimes not. Rose Petals and A Reverence for Roses got theirs from us, and we got it from the find by Field Roebuck and Gregg Grant, in Texas, of an unusually vigorous plant, free of rose mosaic, which did well for them in its own roots, back in the 1980s. On the rare occasions ARE has had it in stock, theirs also has come from us. But they find it problematic on its own roots. We've always grafted it, and on 'Fortuniana' roots, it is easily the most vigorous rose I've ever grown -- to the top of a 16-foot arbor in less than a year. On the other hand, you have to let it get big, since it deeply resents pruning, no matter when you do it.