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"Yeah, seems like I remember the term "evaporative cooling" from somewhere.....the wet cloth would cool the air passing through the fabric by about 10 degrees or so"

Evaporative cooling is only part of the story. The light color cloth reflects sunlight and shades the pot. The pots underneath the T-shirt (or towel)covering stay 20-25 degrees cooler than a pot left in the open sunlight. Where some pots got too hot to touch in the August sun here in Va., the covering makes them cool to the touch.

15-Nov-2007	#8
rockm bonsaiTALK ArchMaster Join Date: Oct-2003 Location: Fairfax, Va Country: USA USDA Zone: 7 AHS Heat Zone: ? Posts: 4,561	"Yeah, seems like I remember the term "evaporative cooling" from somewhere.....the wet cloth would cool the air passing through the fabric by about 10 degrees or so" Evaporative cooling is only part of the story. The light color cloth reflects sunlight and shades the pot. The pots underneath the T-shirt (or towel)covering stay 20-25 degrees cooler than a pot left in the open sunlight. Where some pots got too hot to touch in the August sun here in Va., the covering makes them cool to the touch.