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Interesting article, but these perennial times are too early for us, zone 5a, Oakridges Morraine, between Lake Ontario and Lake Simcoe. Except for snow melt, would probably say the area is normally (not this year) dry in spring. Haven't thought of the whole area as a microclimate, rather part of the gradation northwards.
We would normally see snowdrops emerging in mid/ later March, followed by species crocus.
I don't have the exact cultivar of Caryopteris you are talking about, but mine blooms in the fall, not spring. Both Hillier's Guide to Trees and Shrubs and the DG Plant File entry confirms this. Other than that, your article seems like a useful list.
Im in zone 9a and it's so interesting to know what other zones are experiencing. My narcissus bloomed in early January, my Forsythia is blooming now, so are dandelions and ten petal anemones, scabiosa, pansies, violas. Snap dragons look like they may be finished since it is getting so warm. Azaleas have one bloom...They are about to explode..lots of fat buds with color showing. Snow drops or Snowflakes (I can never remember which) are blooming now. Wild Strawberry and Spurge are trying to take over the world, brugs are sproutin new growth, Plumeria are turning green on the tips, roses are putting on new growth. Purslane is waking up, starting to grow. Irises are green and tall, not yet seeing buds but soon. In the veggie garden, volunteer limas from last year are 4 " tall. Dont envy me however.
In June and July, the sun will try to burn it up and I'll be scrambling to provide makeshift shade. I envy your protective snow blanket. Our freezes seldom produce any snow and they swoop in between days of 60's and 70's like a mugger pouncing on tourists. The only silver lining? Our ground doesn't freeze so even tho it takes time, the plants do recover from the root. 4 days of 22*-30* will kill everything we have back to the root. Then it will be 60* again for a few days. Im always searching for plants that can take this Dr Jekyl, Mr. Hyde weather. I love reading about what it is like in your area. Happy Gardening, Cam