Bay seniors cultivating their taste for nature at its most staggeringly gorgeous are encouraged to get themselves to the 63rd annual Pacific Orchid Expo Feb 19-27 at Fort Mason. There will be a near infinite variety, over 150,000 rare beauties from global growers. Between being overwhelmed you can attend potting demonstrations, lectures and advice for your ailing flower from orchid doctors. Most of the specimens are available for purchase. Seniors $11.