Hi Anne,
As I've mentioned before I've got the same climate you do. And yes, that one cold night last month it went down to 29*! I lost some cauliflower and 5 Romanesco broccoli seedlings. This hasn't happened to me before. Luckily I still have 5 more Romanesco because this is the first time I've gotten them to grow and I can't wait to see how they turn out. I have lots of shrubs and hardy hibiscus
trees and crape myrtles that had been leafing out and all that new growth turned black and died but they are now leafing out again. Could have been worse, I guess.
I do the paper towel thing whenever I have seeds that refuse to germinate. I think it's a great way to tell if they are any good. But I haven't tried it on marigolds. Last week I roughed up a patch of unused ground, roughly 15' by 15'. It's not great dirt but it's not Sedona cement either. And then I broadcast all my older seeds on it, squashes and cucumbers and amaranth and a dozen other things all mixed up and covered it with an inch of shredded leaves. I'm going to
water it every once in awhile and see what happens. I tried this 5-6 years ago but I didn't water it at all and I got nothing.
I have files of weather data for Sedona from Weather Wunderground going back to 2007. It looks like we hadn't had a hard frost below 32* in March since 2010. I will pay more attention from now on. But we had another ridiculously dry winter this year. The last couple of days I have been out trying to turn beds. Not tilling them, just turning over the top 10” or so to incorporate some fertilizer and sulfur to get ready to plant next week. But the soil is so dry that every time I turned the shovel the wind kept blowing all my good dirt away! I have to water it well and then wait for 24 hours so the dirt stays where I want it. Go figure.
But I imagine you don't have this problem because you have all that awesome Oak tree leaf mold to plant into! I bet you can grow anything/everything in that stuff! Happy
gardening.