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What triggers leaves is mostly an irreversible process that begins at some set date and is only stunted slightly after that by temperature. Before the set date, temperature has more influence on timing. After that, spring is on and not easily reversed.
Trees with leaves can withstand nighttime frost and daytime above freezing weather, it's just not great for the tree. Trees have evolved through enough late frost periods though to survive all that, but prefer to be naked of leaves during those times.
Fall is longer a season than spring usually because trees have more control over responding to fall fluctuation than spring fluctuation. This is because pollination only happens once....
Leaf shedding is a continuum
Very northern places with summer growing season get spring in less than a week...quite amazing
You go up to Fairbanks, Alaska June 18th ish and it's sun out 21 hours a day, trees full of leaves, wild life everywhere and would think this is the norm...but 2 weeks before that it looked nothing like that at all
What triggers leaves is mostly an irreversible process that begins at some set date and is only stunted slightly after that by temperature. Before the set date, temperature has more influence on timing. After that, spring is on and not easily reversed.
Trees with leaves can withstand nighttime frost and daytime above freezing weather, it's just not great for the tree. Trees have evolved through enough late frost periods though to survive all that, but prefer to be naked of leaves during those times.
Fall is longer a season than spring usually because trees have more control over responding to fall fluctuation than spring fluctuation. This is because pollination only happens once....
Leaf shedding is a continuum
Very northern places with summer growing season get spring in less than a week...quite amazing
You go up to Fairbanks, Alaska June 18th ish and it's sun out 21 hours a day, trees full of leaves, wild life everywhere and would think this is the norm...but 2 weeks before that it looked nothing like that at all
In France, it's different. You see the first leaves in march but you can see trees who don't have their leaves in may. The spring come very slowly, especially in Britanny who have very few frost days but low maximum temperatures. In maritime stations, you have some days of frost in winter but daily maximums never reach 30°C in summer. The inner locations have similar climate than Paris. Spring come later in the inner locations but i's faster and in late-april, all the trees are fully leaved.
It's starting here in Denver. All the flowering trees are blooming, some varieties of trees are turning green. Most shrubs are green now. In a couple weeks, it'll be very green.
Working in the yard today and trees and shrubs only have the tiniest of buds. In the forest behind my house the only visible green is evergreen trees. There is no green visible in the deciduous trees yet. Grass is green in many spots now though.
A week after my previous post and still very little change in the trees. If you look closely at trees and shrubs you can see small buds but from a distance if you look at the woods there is still no visible green. Not even a slight tinge.
About two to three weeks late at this point I would say.
Kids visiting from an hour north remarked how we can see both bare ground and buds forming here. It's about time! He still has 2 feet of snow in his back yard.
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