Colin "Col" Campbell is a presenter on Gardening Australia, a TV show on the ABC (Australian Broadcasting Corporation). Colin is also a presenter on Brisbane radio station "4BC Brisbane" as the "Gardening Guru" of weekend mornings (7-10am) where he answers a wide range of questions from callers. Common questions usually involve worries about 'yellowing leaves' (Nitrogen deficiency) or 'funny white fluffy stuff' (mealybug). Wikipedia
The definitive Wikipedia entry for Col Campbell. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Col_Campbell