A ten-year-old plant has finally burst into flower for the first time after a decade of care by professional horticulturists—and the stalk was so tall greenhouse had to remove the Roof. The agave sisalana, which is native to the deserts of Mexico, is now beginning its spectacular final act, known as the ‘death bloom’, the last stage of its life cycle. Gardeners installed a ‘bloom watch’ chalkboard so visitors could anticipate the one and only flowering event will culminate in the plant’s death. “It will only flower once in its lifetime which is why it’s also called the ‘death bloom’,” said senior horticulturist Alberto Trinco. SHARE THE SUMMER SPECTACULAR With Gardening Fans on Social Media…