Plants sunburned
By Ed Rosenthal - Monday, February 28 2005
I have these two plants. They were doing well until today. I had them in a very bright indoor patio where they got direct sun all day long. Today was a warm day so I put them outside. When I went to bring them back in they were almost completely dead. It looked like someone bent the stems. What went wrong? How can I save them?NoFax,
Internet,
The plants are suffering from sunburn. They were growing under glass in bright sun. The glass filters out the UV spectrum of light. This is the same part of the spectrum that causes us to sunburn. When you placed the plants outside they received unfiltered light. The leaves weren't accustomed to the powerful UV rays and the plant tissue was burned, causing the leaves and stem to wilt.
Had the plant received unfiltered light on a regular basis, this wouldn't have happened because the plant would have developed a protective response to the UV rays, including increased production of cannabinoids.
Next time, give the plant sunlight each day. It will be able to take the stronger rays as spring turns to summer.
Readers with grow questions (or answers) should send them to Ed at: Ask Ed, PMB 147, 530 Divisadero St., San Francisco, California 94117, USA. You can also email Ed at AskEd@cannabisculture.com, and send queries via his websites at www.ask-ed.net. All featured questions will be rewarded with a copy of Ed's new book, Best of Ask Ed: Your Marijuana Questions Answered. Sorry, Ed cannot send personal replies to your questions.
