Small Flowering Trees: 2 and 6:30 p.m. Wed., Crystal Beach Community Hall, 517 Crystal Beach Ave. (west of Alt. U.S. 19 and 2 blocks south of Alderman Road), Palm Harbor. Sandy Huff shows how to choose the perfect small tree (including more than 20 varieties that thrive in the bay area) to fit under power lines but provide shade and block unwanted views. Free, but registration required. (727) 582-2673.
Valentine Orchids: 9 a.m.-5 p.m. today; 10 a.m.-3 p.m. Sun., Louis Del Favero Orchids, 6601 Gant Road, Tampa. Blooming cattleya, vanda and phalaenopsis orchids for sale, with guest vendors B&B Orchids, Art Stone Orchids, plus experts to help with orchid care questions. (813) 961-8277.
''When Bad Lawns Happen to Good People'': 10 a.m. today, Hernando County Cooperative Extension Service, 19490 Oliver St., Brooksville. Tips on how to make your lawn the best on the block: fertilizing, watering, pest control. Free. (352) 754-4433 to register.
"Violets in Our Backyard": 10 a.m.-4:30 p.m. today; noon-4 p.m. Sun., Sunken Gardens, 1825 Fourth St. N, St. Petersburg. Upper Pinellas African Violet Society show includes gesneriads, blooming violets, starter plants and supplies for sale. Free with gardens admission: $8 adults, $6 for ages 55 and older, $4 kids under 11. (727) 398-7450.
Nature Walk: 10-11 a.m. Sun., Feb. 16-17, Fort De Soto Park, 3500 Pinellas Bayway S, Tierra Verde. Explore park in family nature walk. Free, but registration required. (727) 582-2267.
Discovery Tour: 1-2:30 p.m. Sun., Florida Botanical Gardens, 12520 Ulmerton Road, Largo. Tour the garden areas, from formal to natural and sculpture. Free. (727) 582-2581 to register. www.flbg.org.
Easy Bromeliads: 7 p.m. Mon., Coquina Key Clubhouse, 3850 Pompano Drive SE, St. Petersburg. Coquina Key Garden Club meets; program on choosing and caring for bromeliads. (727) 895-5116.
Native and Exotic Ferns: 7 p.m. Mon., Centennial Park Library, 5740 Moog Road, Holiday. Elfers Centennial Garden Club meets; program by horticulture therapist on both native and exotic ferns. (727) 376-2862.
Springtime Vegetable Gardening: 10 a.m. Tue., Forest Oaks Government Center, 7479 Forest Oaks Blvd., Spring Hill. What to plant for a bountiful spring crop, in Florida-Friendly Gardening series class. Free, on first come-first served basis. (352) 754-4433.
Proper Pruning: 10 a.m. Tue., Austin Davis Library, 17808 Wayne Road, Odessa. Master gardener program on the basics of pruning and shaping to ensure healthy plants. Free. (813) 744-5519, ext. 105.
Rain and Bog Gardening: 6:30 p.m. Tue., Riverview Library, 10509 Riverview Drive. Learn how to create a bog garden in low-lying garden areas to conserve water, in master gardener program. Free. (813) 744-5519, ext. 105.
Superb Butterfly Sites: 7-9 p.m. Tue., Moccasin Lake Nature Park, 2750 Park Trail Lane, Clearwater. Learn best places to observe butterflies in Pinellas Chapter of the North American Butterfly Association's program, "A Butterfly's View of Pinellas County: Superb Sites to Sight Butterflies." Free. (727) 462-6024.
Organic Gardening: 7 p.m. Tue., Jimmie B. Keel Regional Library Gallery, 2902 W Bearss Ave., Tampa. Master gardener program on the basics of organic gardening. Free. (813) 744-5519, ext. 105.
Native Plant Principles: 7:30 p.m. Tue., St. Mark's Presbyterian Church, 7922 S.R. 52, Hudson. Native plant wholesaler Brightman Logan shares the basics of using them in the landscape;plant raffle;meeting of the Nature Coast Chapter of the Florida Native Plant Society. (727) 848-2177.
Fungus Among Us: 7:30 p.m. Tue., Boyd Hill Nature Park, 1101 Country Club Way S, St. Petersburg. Learn about common fungi, mushrooms and toadstools, which are edible and which are toxic, and how to identify them; Natural History Speaker Series program. Free. (727) 893-7326.
Uprooting Weeds: 1 p.m. Wed., Finnish-American Club, 6016 Delaware Ave., New Port Richey. Garden Club meets with tips from horticulture agent Jim Moll on controlling weeds in the garden. (727) 848-2292.
African Violets: 10 a.m. Thur., Jan Platt Regional Library, 3910 S Manhattan, Tampa. Master gardener plant clinic on care of African Violets. Free. (813) 744-5519, ext. 105.
"Orchids of Brazil": 7 p.m. Thur., Pinellas County Extension Service, 12520 Ulmerton Road, Largo. Florida West Coast Orchid Society meets with class at 7 p.m., followed by speaker Francesca Morenda's program: "Orchids of Brazil." (727) 733-8167.
Designing a Dish Garden: 10 a.m. Fri., Seminole Garden Center, 5800 Central Ave., Tampa. Tampa African Violet Society meets; program by Mina Menish on how to design a colorful dish garden. (813) 989-2934 or (813) 494-5775.
Herb Fest: 8 a.m.-1 p.m. Feb. 16, Pinellas County Extension Service, 12520 Ulmerton Road, Largo. Herb plants for sale; demonstrations on growing and cooking with herbs, drying and storing them; sustainable gardening information; in conjunction with weekly Market in the Park. Free "Wonderful World of Herbs'' program; 10 a.m.-11 a.m. tour herb garden, make herb treat; (727) 582-2673 to register for program. Free admission. (727) 582-2100.
Wetlands Nature Walk: 9-10:30 a.m. Feb. 16, John Chestnut Sr. Park, 2200 East Lake Road, Palm Harbor. Discover plants found in wetlands and pine flatwoods areas and their use in the past for medicinal and other purposes. Free, but registration required. (727) 669-1951.
Uplands Ecosystems: 12:30-3:30 p.m. Feb. 17, Weedon Island Preserve Cultural and Natural History Center, 1800 Weedon Drive NE, St. Petersburg. Learn about native plant habitats in local ecosystem, ecology of animals and historical changes in Weedon's landscape in seminar for adults. Free, but registration required. (727) 453-6500.
Garden Help: Lackluster lawn? Problem pests? Master gardeners offer advice, diagnose plant problems and answer landscape questions 9 a.m.-1 p.m. weekdays at Forest Oaks Government Center, 7479 Forest Oaks Blvd., Spring Hill, (352) 540-6232, or 9 a.m.-5 p.m. weekdaysat Hernando County Cooperative Extension Service, 19490 Oliver St., Brooksville. (352) 754-4433.
Pinellas County Market in the Park: 8 a.m.-1 p.m. Saturdays, Extension Service, 12520 Ulmerton Road, Largo. (727) 582-2100.
Saturday Morning Market: 9 a.m.-2 p.m. Saturdays, along Central Avenue, from First to Second streets, downtown St. Petersburg. (727) 455-4921 or www.saturdaymorningmarket.com.
Sweetwater Sunday Organic Market: noon-4 p.m. Sundays, 6942 W Comanche Ave., Tampa. (813) 887-4066 or www.sweetwater-organic.org.
Largo Harvest Marketplace: 9 a.m.-3 p.m. Thursdays, Ulmer Park, 301 West Bay Drive, Largo. (727) 587-6740, ext. 5017.
Mustang Produce Market: 8 a.m.-4 p.m. Saturdays and Sundays, Mustang Flea Market, 7901 Park Blvd., Pinellas Park. Free admission, $1 parking. (727) 544-3066.
Longleaf Farmers' Market: 3-6 p.m. Thursdays through April 24, Town Avenue and Starkey Boulevard, New Port Richey. (727) 375-8986.
Treasure Island Open Air Market: 9 a.m.-1 p.m. Fridays, Treasure Island Community Center, Gulf Boulevard and 106th Avenue. (727) 360-4121.
Send submissions to Garden Calendar, Newsfeatures, St. Petersburg Times, P.O. Box 1121, St. Petersburg, FL 33731; e-mail firstname.lastname@example.org, or fax (727) 892-2327. Deadline is two weeks before publication.