Completely agree with Hubbardston. With possible exception of Boule de Nanteuil, no rose comes close. Mine is 22 years old, got it from Pickering. Succeeded under a peach tree which died, thrives a bit more now in full sun. Color is unlike any other very clear white with pink inside. Fragrance to get lost in. Leaves are gray like Colorado spruce and always healthy. Never a bug. No care no fuss no feeding no pruning she just grows up through the tangle of other plants and weeds every year to strut her stuff. Yes no pruning let the canes grow long and flop over that’s how she blooms best - a riot in June. Yes 5’ tall is about right but the canes are 12’ long Even the thorns aren’t bad I once had 30 kinds of roses none measure up to this one.
This is planted in shade/dappled shade in my garden so it took a few years to get 4-5 feet tall. My favorite thing about this rose is that it blooms in October, with buds and hips, so the pale pink blooms and the tomato red hips against the rest of the fall foliage is just the prettiest thing ever. Needs very little care. No diseases at all.
I purchased two of these many years ago from Heirloom, and over the years have come to regard GMB as the finest rose I have ever grown. Despite receiving only 5-6 hours direct sunlight each day, prevalence of blackspot in the local soils, and winter conditions that can drop from +40 F to -15 F in 24 hours, this rose routinely exceeds 6 feet tall, and remains healthy and hardy year after year. The once blooming flowers have a fragrance that is addicting, such that the bloom period (2nd half of June in Massachusetts) has become an event I look forward to every year. If your garden wants a big & tall fragrant rose needing little fuss, GMB should be at the top of your list.