We're still gathering information for this section, but in the meantime, please check out the following helpful and trusted websites.
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Perennials for Texas Landscapes
Dr. Bill Welch is editor of The Southern Garden web site within Aggie Horticulture. He is also a contributing editor for the Horticulture Update newsletter.

Perennial Garden Color

Cutflower Gardening

Tips on Dividing Perennials
To increase your stock of perennials, divide spring and summer bloomers during the fall and winter.

Outstanding Perennials for Texas
List of perennials that perform well in Texas - those designated for Region 4 will do well in Collin County. Plants designated with a "7" from this list will do well all over Texas.

Texas SmartScape® database - Under the Plant Type field, select 'Perennials' and click the Search for Plants button. (Or chose additional fields to drill down your search, such as plant shape, bloom color, and more.)

Cornell Herbaceous Perennials was created by Texas A&M University professor and Cornell alumnus Allison Meyer. It is searchable via scientific name, common name, and photographic indices as well as through a search page in which visitors may enter more detailed criteria such as plant names, family, flower color, plant height and growth habit, foliage texture, propagation methods, hardiness zone, season of bloom, and water and light requirements.
Note: Check the hardiness zone and PH preferences to make sure that the plants you choose from this list will perform well here in Collin County. Cornell University is in Zone 5 and Collin County is considered Zone 8, so some of these plants may not perform well in Texas.