Frost Warning
But maybe the brisk wind will mitigate it.
I don’t think things are so advanced that a frost will do harm. Serviceberry in full bloom, apple blossoms turning pink, redbud budding red, but pretty much everyone accustomed to May being variable. And, unlike a normal year, the rosemary bush, instead of being outside under the apple tree fending for itself, is still indoors being pampered.
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I have a lot of respect for Kim Stanley Robinson, the science fiction writer. His Mars trilogy, written years ago now, details in an engaging way how Mars will be colonized and eventually terraformed. He does his research. He knows what he’s talking about. This is worth reading.