January
Indoor Plants, January 6, 1999 (missing)
Climate and Weather Prediction, January 13, 1999
Soil Genesis, January 20, 1999
Growing Mushrooms at Home, January 27, 1999

February
Pruning Fruit Trees, February 3, 1999
Transgenic Technology in Crop Plants, February 10, 1999
Backyard Grape Culture, February 17, 1999
Native Landscaping: Penstemons, February 24, 1999

March
The Desert Willow, March 3, 1999
Buffalograss, March 10, 1999
A Beaver's Tale, March 17, 1999
Verde Valley Agaves, March 24, 1999
The Chile Pepper, Part I, March 31, 1999

April
The Chile Pepper, Part II, April 7, 1999
The Chile Pepper, Part III, April 14, 1999
Seed Secrets, April 21, 1999 (missing)
Africanized Honey Bees, April 28, 1999

May
Noxious Weeds, May 5, 1999
Understanding Insects, May 12, 1999
Understanding Insects: Part 2, May 19, 1999 (missing)
Aphids, May 26, 1999

June
Garden Composting, June 2, 1999
More On Composting, June 9, 1999
Spiders, June 16, 1999
Farm Fresh Foods, June 23, 1999
Worldwide Web Gardening, June 30, 1999

July
Garden Hoses, July 7, 1999
July 14, 1999 (missing)
Warm Season Lawn Mowing, July 21, 1999
A Scentsory Experience: Pelargoniums: Part I, July 28, 1999

August
A Scentsory Experience: Pelargoniums: Part II, August 4, 1999
Summer Storms, August 11, 1999
Grand Canyon Sweet Onions, August 18, 1999
Vermicomposting, August 25, 1999

September
Yellow Starthistle, September 1, 1999
Prickly Pear Cactus, September 8, 1999
Creating a Wildflower Meadow, September 15, 1999
Verde Values, September 22, 1999
Soil Phosphorus, September 29, 1999

October
Basic Plant Processes, October 6, 1999
Grasshoppers, October 13, 1999
Growing Garlic, October 20, 1999
Fall Leaves, October 27, 1999

November
The Chocolate Flower, November 3, 1999
Peach Tree Borer Control, November 10, 1999
Water Harvesting, November 17, 1999
Powdery Mildew, November 24, 1999

December
Mycorrhizae: The Friendly Fungus, December 1, 1999 (previously published October 21, 1998)
Christmas Trees, December 8, 1999
Cold Temperatures and Plant Growth, December 15, 1999
Frost Protection, December 22, 1999
Garden Composting, Decebmer 29, 1999 (previously published June 2, 1999)