Resources provided by the U.S. Department of Agriculture through the Natural Resources Conservation Service and the Farmer's Almanac offer extensive plant information. These two resources cover a broad range from edible plants to ground cover crops.
The NRCS offers a variety of plant information that includes slide shows for images of plants, maps that depict different regions where plants grow, wetland plant lists, pocket guides for field identification of plants and lists of common weeds found throughout the country. The NRCS also shows plants of different cultural significance, lists of invasive and noxious plants and plants that are threatened and endangered. The database compiled by the USDA is a composite of information on vascular plants, mosses, liverworts, lichens and hornworts within the United States, Puerto Rico and the Virgin Islands.
The Farmer's Almanac provides plant information on vegetables, fruits and herbs. Planting dates, growing guides and nutritional information is provided for all edible plants. Along with plant information, the Farmer's Almanac also provides information on how to build root cellars, how to jar different vegetables and how to measure out fruit for jams and jellies. In addition, the Farmer's Almanac provides different plant hardiness zones and lists the varying pH preferences for growing healthy plants.