Gardeners are a practical bunch. Here are some useful additions to horticultural libraries. For newbies, “Pat Welsh’s Southern California Organic Gardening: Month-by-Month,” and Nan Sterman’s “California Gardener’s Guide, Vol. II.” For edibles enthusiasts, Rosalind Creasy’s “Edible Landscaping” and Ivette Soler’s “The Edible Front Yard.” Native plant lovers will enjoy “California Native Plants for the Garden” and “Reimagining the California Lawn,” both from Cachuma Press. Gift certificates from specialty nurseries as well as memberships in the San Diego Horticultural Society and San Diego Floral Association will be appreciated. Also, quality garden gloves and clippers are sure to bring grateful thank-yous.