Gardening with Perennials
Fall and winter care for your perennials. Information provided by the University of Illinois Extension.
https://extension.illinois.edu/perennials/fall.cfm
Maintaining a Perennial Garden and Preparing your Garden for Winter
Two great sources from the Better Homes and Garden website.
http://www.bhg.com/gardening/flowers/perennials/maintaining-a-perennial-garden/
http://www.bhg.com/gardening/yard/garden-care/preparing-your-garden-for-winter/
Perennials
An in-depth, online tutorial guide broken into six classes. The Learning Garden is a project of the National Garden Association.
http://garden.org/courseweb/perennials/Class1/c1p1.html
Growing Perennials
A great overview of growing perennials, developed by The Gardener's Supply Co.
http://www.gardeners.com/how-to/growing-perennials/5073.html
More resources added regularly...