Hibiscus rosa-sinensis 'Dorothy Brady'
This is an old variety and is a classic large double rose red. At this time of year I assume the colour is deeper and even tends towards scarlet at the edge of the petals and will go back to a lighter pink in the warmer months. There are some white streaks on petals and this is normal though any streaked flower petals remind me of some sinister work undertaken by a thrip at time of pollination and subsequent development. Just think of all those streaky tulips by way of comparison.
This is a vigorous tall growing Hibiscus and is highly recommended as it is a prolific bloomer. It was bred by Brady E Foster from 'Surfrider' x 'Kona' and registered in 2002.