What's blooming on September 1? As we acknowledge that even though it isn't officially autumn, we notice the days are shorter, and a maple or sumac branch here and there has begun waving scarlet in the sunlight, the bloom goes on.  Thomas Affleck is the only rose, as usual, that has much to show at this time of the year, although there is a stray blossom here and there on the Rose Walk. The ruogosa hips are ripening.…