References

The Well Tended Perennial Garden, Planting and Pruning Techniques – 1998 – Tracy DiSabato-Aust, Timber Press, Portland. 269 pages. Approx. $30 hardcover.

A-Z Encyclopedia of Garden Plants – 1996 – American Horticultural Society, C. Brickell and J.D. Zuk, ed. DK Publishing, 1095 pages. Approx $80 hardcover.

Look for an extensive, new perennial bulletin from CSU Cooperative Extension due out this fall.

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Date last revised: 01/05/2010