Duane Campbell of Bradford County PA (zone 6b) is a regional expert in all things plants and soil.
One of his recent articles focuses on health care for plants: Sun, soil, air, etc.
"Just as colds and flu can lay low people who are taking care of themselves properly, even healthy plants can succumb to common bugs and diseases when the season is right. That's what medicines are for. Call an antibiotic a pesticide and people would think twice before swallowing it, but that is just what it is."
Check out his columns at this link for Daily Local News.
Campbell's water garden piece at Bella Online is here.
He has been writing about gardens and gardening for 30 years and knows his stuff. Check it out.