The Texas A&M Extension Service is the defacto standard when it comes to research and answers to plant and gardening questions. Offices are in most counties in Texas, and the central brain is located in College Station. San Antonio's own Dr. Jerry Parsons is fabled among Extension Service agents. Here are many .PDF files and links to Extension Service documents that will help you in your quest for horticultural success and excellence.
General:
Vermiculture - Earthworm Culture
Follow Proper Pruning Techniques
Vegetable Gardening:
Home Vegetable Gardening Guide
Vegetable Gardening in Containers
Earth Kind Nematode Control During the Summer
Recommended Vegetable Seed Varieties
Raised Bed Gardens When Your Yard is on Top of a Rock
Deer Proofing:
Herbs:
Fruit and Nut Trees:
Pests of Peaches, Plums, Pears and Pecans
Disease Control Products for Fruit Trees
Rabbiteye Blueberry Production in Texas
Composting Principles:
USDA Composting Backyard Conservation
Don't Bag It Leaf management Plan
Insect and Disease Control:
Entomosporium Leaf Spot of Photinia and Indian Hawthorn
Oak Canker Disease - Hypoxylon
Vegetable Disease Control Products
Insects in the Vegetable Garden
Insect Control Around the Home
Weed Control:
How to Control Sandburs in Lawns
Anything to Do With Roses:
Landscaping:
Earthwise Guide to Landscaping
Low Maintenence Landscaping Tips
Protecting Existing Landscape Trees from Construction
Fertilizer:
Lawns:
Improving Turfgrass in the Shade
Takeall Patch Disease in St Augustine
Maintaining Bermuda Grass Lawns
Maintaining St. Augustine Grass Lawns
Rainwater Harvesting:
Water Gardening