Christine Noguere recommended
for answers about fertilizers, etc.
Here is a list of some interesting web sites from Debbie D., one of our Master Gardeners, that might answer some of your questions: Cyndi's Catalog of Garden Catalogs, the home gardener's one stop to find all the mail-order catalogs in the US and Canada  Fine Gardening Magazine provides inspiration, practical information and resources to help you create garden spaces Cornell University Vegetable MD Online was developed to provide access to the many vegetable diseases  United States National Arboretum, information on invasive plants, a variety of gardening tips and ideas Lady Bird Johnson Wildflower Center, search for information in their extensive native plant database, a variety of articles on gardening topics as well as a gardening forum where you can find answers to your questions