On Mon, 5 Apr 2004 23:14:58 +0100, "Mark Allison" nomail@please
wrote:

(Frogleg wrote)

The ideal germination temperatures for the veg you mention are around
21-27C, so you're dealing with both too hot and too cold. How does the
temperature in the propagator get to 40C in the daytime without the
heat on?

Well, I was surprised it got that hot too. This was on a fairly sunny day
with the lid on the propagator and the vents open. When I put my hand over
the vent, I could feel the heat coming out. The greenhouse temp was around
25C at this time. When the sun goes in for a while the greenhouse temp is
around 12-18C during the day. Should I bring all my seed trays into the
house, or should I wait a few weeks and see what happens?

Let me see if I've got this right: you have a propagator inside a
greenhouse. The heat for the propagator is off, and the vents open.
The temperature in the greenhouse is 25C (sunny day), and the
temperature inside the propagator is 40C. Goodness, what a little
clear plastic will do! Having broiled a set of seedlings with a
similar arrangement (except I had the heat on below the propagator),
all I can advise is keeping a sharp eye/ear on the weather. If it's
going to be sunny and warm, give extra ventilation to the propagator.

As for bringing the trays indoors, that'd be fine for germination.
However, once the seedlings emerge, they need light, and you'd have
the same problem until the plants were large enough to be unlidded in
the greenhouse. Perhaps someone else has better ideas.