Able Farm and Gardening: Low Allergy Gardens 
Thirteen tips by Elizabeth B. Tritt.
http://groups.msn.com/AbleFarmandGardening/themegardens.msnw?action=get_message&mview=0&ID_Message=1685&LastModified=4675496054401793399Burke's Backyard: Low Allergy Gardens
Article on pollen-producing plants, including asthma weed, safe plants, and plants to avoid.
http://www.burkesbackyard.com.au/1998/archives/26/in_the_garden/gardening_tips,_books,_techniques_and_tools/low_allergy_gardens
Children's Health Environmental Coalition: Allergies in the Garden
Article by Pamela Lundquist with tips for reducing and avoiding pollen and mold, lists of plants to avoid and those that may be tolerable to allergy sufferers, and links.
http://www.checnet.org/healthehouse/education/articles-detail.asp?Main_ID=572
Home and Garden Television: Allergies
Master gardener Paul James provides general guidelines for identifying allergy-causing plants and lists of plants to avoid.
http://www.hgtv.com/hgtv/ah_personal_care_allergies/article/0,1801,HGTV_3143_1391361,00.html
