Horse manure didn't work for me with this rose ... too alkaline. This rose prefers slightly acidic as own-root.
I like what Luxrosa wrote in forum about best scents:
"luxrosa
Bourbon: Mme. Ernst Calvat'
Damask: Celsiana, or La Ville de Bruxelles, both are also exquisite roses.
Scotch Burnet'- lily of the valley scented- with what a freind calls " high quality french bar soap" 'Altaica'
Rambler: The Garland.
Hybrid Musk: Cornelia and Prosperity. Prosperity is more sweet, Cornelia more musky.
Species: The Incense Rose, Rosa primula, its' leaves are so strongly fragrant it merits its nickname,(its blooms I'd rate 2 out of 10 for strentgh of scent) I also love Rosa moschata because it sends its scent floating around the garden on a warm humid breeze.
Old Garden Tea: Anna Olivier' and Etoile de Lyon'
Noisette: Secret Garden Noisette, most strongly scented Noisette to my nose.
Hybrid Perpetual: Marchessa B.
Pernetiana 'President Herbert Hoover' I am amazed at how strongly, and deliciously fragrant this rose is." Luxrosa in CA.