|Does translucent greenhouse fiberglass roofing filter wavelengths of light useful to 4 inch pots of herbs that 6 mil plastic used with shadecloth does not?
|In general, poly covers allow transmission of more of the light spectrum than fiberglass. That's one piece of the equation - now you have to weigh the other pros and cons of poly and fiberglass, and see which covering is best for your situation. If you're a new commercial grower, your extension office (ph# 504/482-1107) can help you with planning and information. If you're a hobby grower, contact the Hobby Greenhouse Association; info on the organization can be found at:
http://trine.com/GardenNet/Gar... Greenhouse Association