Tree Help: http://www.treehelp.com/learning-center/ – This website has information on how to care for trees and shrubs as well as education on the diseases and insects that effect them.
Find your Hardiness Zone: http://planthardiness.ars.usda.gov/PHZMWeb/# – This is an interactive website to help discover what hardiness zone you live in. Enabling you to choose plants that are capable of growing in your area.
Find a Plant: http://www.naturehills.com – This site allows you to explore all different types of plants, trees and shrubs. See what they look like, when they bloom, what hardiness zone they grow in, and how big they get.
Growing Degree Days: http://www.oardc.ohio-state.edu/gdd/ – This site provides a list of the phenological events as and when they occur, so that better pest management decisions can be made.
OSU Extension office: http://extension.osu.edu/
Want to see a certain plant in person? http://www.plantplaces.com/index.shtml – this site allows you to search for where in your area you can go to see a certain plant in a landscape setting.
Is that a weed? – http://weedalert.com/- This sight helps you identify what kind of weed is in your landscape bed, how to get rid of it, and if its poisonous.
This site will allow you to set search parameters to find the plant to work in your specific spot. http://www.monrovia.com/plant-catalog/