When selecting a poinsettia look for dark healthy leaves with no yellowing bottom leaves. The bracts (leaves that work as petals) should be bright and completely colored. The true flowers are the tightly clustered, small, green or red-tipped flowers in the center of the bracts. Yellow pollen will shorten the life of the flowers. Do not choose a plant that is wilted or drooping.
Poinsettias are very sensitive to the cold so if the temperature is below 50 degrees outside make sure that it is wrapped for protection when you buy it. In order to maintain a healthy Poinsettia during the holiday season, keep the plant in bright diffused light away from heating vents and cold drafts. Cool night temperatures will extend blooming time. Keep the plant evenly moist as moisture fluctuation and cold or hot drafts can cause premature leaf drop. Do not let it stand in water.
Art Phillips, Smith County Master Gardener
Texas AgriLife Extension Service
Annual & Perennial Flowers Index
Gardening Tips For NorthEast Texas Index
East Texas Piney Woods Gardening Home Page