GH's in our zone can be tricky because of drastic warm ups and cool downs. Air circulation is very important in a GH so keep that fan going 24/7 if you get a lot of condensation inside. You might also discover algae growing on top of your soil as well, fooling you into thinking the plants don't need water. I essentially water on demand. I'll either stick my finger into the pot a few inches to see if it's dry or lift it to see if it's light. When I do water, anything in a pot larger than a one gallon pot gets drenched with the hose until it's coming out the bottom. Everything else I use a watering can. I also only do heavy duty watering in the morning on days when I can open up my greenhouse completely. Also, nothing sits directly on the ground so air can flow underneath the pots.
You'll want to keep an eagle eye out for spider mites. I check everyday.
Is yours heated?
