BBC: An ancient Chinese proverb tells us that with patience a mulberry leaf eventually becomes a silk gown. Its wisdom is not lost on staff at Rowallane Garden near Saintfield County Down. Since 1908, gardeners there have tended to the Chinese Goat Horn Tree, hoping that one day it would show off its capricious flower. After 92 summers, the day has finally arrived. “We had noticed in June that the tree was making flower bud growth which has slowly developed over the …