Alberto: You may have directed this message to me instead of to someone else. I have made no comments about black or white containers. Andrew -----Original Message----- From: pbs-bounces@lists.ibiblio.org [mailto:pbs-bounces@lists.ibiblio.org] On Behalf Of Alberto Castillo Sent: Wednesday, October 05, 2011 6:02 PM To: Pacific Bulb Society Subject: Re: [pbs] Clay vs plastic To Andrew: Black is the best heat trapping color. Inside a greenhouse in a cool/cold climate this will mean a lot of heat retained that would speed up growth. Likewise white pots are a lot cooler than black, green, etc. ones, particularly the side that does not receive direct sunshine. I use both black and white containers depemding on the temperature needs of the plants. Of course this is more evident as pots increase in size.