"horticultural fleece" actually works, too. it's that lightweight woven
material that you place over the plants and pin down with garden staples. i've
seen 8 by 10-foot sheets being sold for around $8. HOWEVER, if you want save
$$$, ask for "septic paper." it's the same stuff, but at 6 feet wide (on a
roll) you can get it for 10¢ a foot!

pat