I cover dormant pots of bulbs, in the greenhouse, with a white cotton sheet during hot summer weather. Vents stay open and there is usually a lot of glass missing from the sides of my bulb houses. Frost is the only reason for full glazing and only in winter for tender plants. Peter (UK) On Wed, Jun 27, 2012 at 7:19 PM, James L. Jones <jmsjon664@aol.com> wrote: > At some point, several years ago, during my semi-annual move of dormant > geophytes outside from my solar greenhouse, I asked myself, "Why am I doing > this?" These plants want dry heat! Since then, to the relief of all of us > they stay inside and prosper. > There are a couple of distinctive factors at play here that keep the > temperature from soaring: an overhead pane is removed (it's plastic) and a > large tub of water provides thermal moderation. In any case, it has worked > just fine. >