Answer: Impatiens may yellow for a variety of reasons, but in my experience the most common reasons are transplant shock, cold weather/soil, overwatering and underwatering. If they have just come out of a greenhouse they need to be conditioned gradually to life in the rain, wind, and sun. If this is not done, they will suffer. Impatiens will not tolerate cold temperatures or cold soil. With regard to watering, they should be watered enough to keep the soil evenly moist but not sopping wet. If planted in the ground, it is usually a good idea to add ample organic matter to the soil to help it retain both air and moisture and thus help the roots stay healthy. I hope this helps you trouble shoot.
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