For a once-flowerer, it has a long flowering season. In South Australia, Mediterranean climate, where it is a common surviving understock, it starts in early August (winter) and flowers through to November.

Strange to me how this is described as a hybrid Noisette, since it was bred in China before 1811... the Noisette names are ''found'' names presumably..

Paxton's Horticultural Register 4(47): 187 (May 1835)
Edited by James Main, A.L.S.
Mr. Loudon, in the last number of his Arboretum Britannicum, says, that this plant [Magnolia conspicua] was introduced by Sir Joseph Banks along with Hydrandea Hortensia, Paeonia Moutan, and Rosa Indica, about 1789.

[Given the date, this could be the Rosa indica major, but without a description I won't insist.]

However, at the time of his death [1780], Dr. Fothergill had Rosa indica L. in his garden at Upton.

My thought is that the name Rosa indica major came about because of a superficial resemblance to R. indica (R. banksiae or cymosa).