Gene, since you got down to 28 last time there seems to be a good chance you
might be in danger (100 plants? How sore are your backs?). I've tried the
tarp route and paper and sheets and covering individual plants with pots and
the pots (in your case cups) seem to work best -- anything the touches the
surface of whatever is protecting the plant may suffer damage and the little
pot or cups holds the warm air around the plants without crushing them. In
Denver they sold a product (can find in catalogues) called a "Water well"
that was very much like a kids floatie or instead of filled with air they
were filled with water --

--
Marta
(if you email me directly you need to remove the X )