I grow several old garden roses that have varying degrees of remontancy. 'Rosa de Resht' blooms sporadically throughout the summer after the first main flush but unless the weather is very dry (which is rare in my location), it will quickly be infested with blackspot. 'Duchess of Portland' usually makes some effort to reflower but it is one of the worst culprits for blackspot with leaves not having any green areas remaining by mid-summer. This year after a hot dry June and July never even attempted any new growth or flowers when finally in August we had some rain. 'Quatre Saisons Blanc Mousseux' is quite healthy but the "autumn" flowering in August is rather brief and sparse. 'Stanwell Perpetual' is healthy and reflowers well although after July it never has more than two or three flowers out right through to October and never really makes much of a display despite the individual blooms and buds being very beautiful. 'Agnes' tries to have a second flush but usually quite late and the weather in September is starting to become to cold and wet for the blooms to open properly with many just remaining as buds. This year it bloomed well again in August but this was exceptional. But for health and quantity of flower this rose 'Jacques Cartier' or 'Marchesa Boccella' or whatever it's called far out does the rest. I cut half a dozen blooms for a friend yesterday and it has hardly dented the display. In my climate with cool damp summers it grows about 1.2M and is as good as any modern rose. Its growth is very like a hybrid-perpetual.