Frozen Top Soil Conifers. Help needed.

Runstenen

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Couldnt upload video. Seems to be a couple of mms of solid ice on the soil surface. 😮‍💨
 

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HorseloverFat

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I’ve only seen heat pads recommended to help seeds and cuttings. I would worry they’d dry out the soil and create frequent rapid fluctuations in soil temperature.
ALSO.... for fall collections over winter.

But OP....
All in all : We sometimes get -25 Celsius / -13 FH for weeks on end here.
This confuses me.

BUUUT I looked into your climate...

I think that if you make a lil' lean-to... You'd be fine...

How many trees, 100?... 200?

If WAY less than this, making a little shed... Or just placing them on the ground.... Species depending....

EDITEDITEDIT!!!! I think I know what's going on here.... You THINK you are USDA 7a.... But you are a bit warmer than me in winter...AND cooler than me in summer.

Check this... It's MY climate (USDA 5a/AHS-3)... Compared with YOURS... AND Chicago....
Your climate falls BETWEEN them.

You should ACTUALLY consider yourself USDA 6 (Possibly even 5b).

...like finding your REAL bra-size, eh?

I'm here for support! 🤦🏽‍♂️

Ok... What species have you got?.. we'll get you "squared away"
 

Runstenen

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ALSO.... for fall collections over winter.

But OP....

This confuses me.

BUUUT I looked into your climate...

I think that if you make a lil' lean-to... You'd be fine...

How many trees, 100?... 200?
Haha. Like 20 or so ..

If WAY less than this, making a little shed... Or just placing them on the ground.... Species depending....

EDITEDITEDIT!!!! I think I know what's going on here.... You THINK you are USDA 7a.... But you are a bit warmer than me in winter...AND cooler than me in summer.

Check this... It's MY climate (USDA 5a/AHS-3)... Compared with YOURS... AND Chicago....
Your climate falls BETWEEN them.

You should ACTUALLY consider yourself USDA 6 (Possibly even 5b).

...like finding your REAL bra-size, eh?

I'm here for support! 🤦🏽‍♂️

Ok... What species have you got?.. we'll get you "squared away" See below
Ok, are you ready … 🤪😂
BP - Big Pot. SP - Small Pot. MP - Mini pot

Outside in the noob tent :
•2 Yamadori Scots Pines ( In crates w pure pumice ) BP
•1 Mugo Pine ( in big growout pot w 33/33/33% conifer mix ) BP
•1+1 Procumbens and Chinensis Junipers
( in pretty big growout pots w 33/33/33% conifer mix ) BP

In the shed :
•Birch / Betula Pubescens BP
•Ash / Fraxinus Excelsior BP
•Oak / Quercus Robur BP
•Japanese White Pine / Pinus Pentaphylla S/MP
(I keep this in the shed this first year because it’s a small pot. I’m a coward I know … )
•Alberta Spruce / Picea Glauca (same cowardry here as with the Mames and some of the Shohin) S/MP
•Gold Larch / Pseudolarix Amabilis SP
•Crabapple / Malus Floribunda BP
•Cotoneaster / Cotoneaster Dammeri SP
•Mini Rose / Rosa Helenae BP
•Norwegian Maple / Acer Platanoides BP
•Artropurpureum Maple / Acer Palmatum B/SP
•Blood Beech / Fagus Sylvatica SP
•Japanese Cherry / Prunus Incisa SP
•Japanese Azalea/Rhododendron Japonicum MP
•Mames of Scots Pine, Maple, Ivy and Ash MP

Tropicals / Subtropicals indoors w grow lights :
•Desert Rose / Adenium Obesum
•Tiger Bark Fig / Ficus Retusa
•Chinese Privet / Ligustrum Sinense
•Bird Plum / Sageretia Theezans
•Chinese Elm / Ulmus Parvifolia
•African Boxwood / Myrsine Africana

To say the least - A wide variety from around the globe ✈️☀️💨🌦️❄️☃️🌏

..;;::THE END::;;..
 
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HorseloverFat

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Interesting. I just googled my position and got 7a straight away 😬🤯
Haha! Ok... Did you NOT look at the link I sent you...

IF you ARE in 7a..(but you are NOT). All your trees will be fine without protection..

So If you are confident that you are 7a... Even though you have a Chicago climate... Well ... You MAY run into some issues.

I am not trying to be rude..

But I am, effectively, somewhere between 4-5 USDA... And I'm warmer than you in summer... Your winters are in between Chicago (Zone 6) and My own (Zone 4-5)...

USDA is pretty difficult to equate to other continents...

But Zone 7, here... Is Like Charlotte, North Carolina...

Here is Stockholm, and Charlotte... Compared.

Remember that Charlotte... Is FOR SURE zone USDA 7..
Quite different.

Here is a screenshot of ONE of the analysis the site provides. (If others don't want to click in)Screenshot_20221218-094511.png
 
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HorseloverFat

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Ok, are you ready … 🤪😂
BP - Big Pot. SP - Small Pot. MP - Mini pot

Outside in the noob tent :
•2 Yamadori Scots Pines ( In crates w pure pumice ) BP
•1 Mugo Pine ( in big growout pot w 33/33/33% conifer mix ) BP
•1+1 Procumbens and Chinensis Junipers
( in pretty big growout pots w 33/33/33% conifer mix ) BP

In the shed :
•Birch / Betula Pubescens BP
•Ash / Fraxinus Excelsior BP
•Oak / Quercus Robur BP
•Japanese White Pine / Pinus Pentaphylla S/MP
(I keep this in the shed this first year because it’s a small pot. I’m a coward I know … )
•Alberta Spruce / Picea Glauca (same cowardry here as with the Mames and some of the Shohin) S/MP
•Gold Larch / Pseudolarix Amabilis SP
•Crabapple / Malus Floribunda BP
•Cotoneaster / Cotoneaster Dammeri SP
•Mini Rose / Rosa Helenae BP
•Norwegian Maple / Acer Platanoides BP
•Artropurpureum Maple / Acer Palmatum B/SP
•Blood Beech / Fagus Sylvatica SP
•Japanese Cherry / Prunus Incisa SP
•Japanese Azalea/Rhododendron Japonicum MP
•Mames of Scots Pine, Maple, Ivy and Ash MP

Tropicals / Subtropicals indoors w grow lights :
•Desert Rose / Adenium Obesum
•Tiger Bark Fig / Ficus Retusa
•Chinese Privet / Ligustrum Sinense
•Bird Plum / Sageretia Theezans
•Chinese Elm / Ulmus Parvifolia
•African Boxwood / Myrsine Africana

To say the least - A wide variety from around the globe ✈️☀️💨🌦️❄️☃️🌏

..;;::THE END::;;..
Groovy mix! Even in your (I'm gonna say USDA 6a) climate.. most of those "outdoor-all-year" trees will be fine if you set them on the ground and bunch them together.

Use an unheated shed/garage if you want extra protection...
 

19Mateo83

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Technically only half of Charlotte is zone 7B, the other half is zone 8. We have very mild winters here, we rarely see below 30f (-1.1c) Our summers are hot and humid. We regularly reach 96f (35.5c)
I would say you are in a slightly cooler zone than we are. Ol SquarePants with conkers may be right about you being in zone 6a my friend. E7DAF905-CB70-4C71-BBD3-DC581BA81E02.jpeg3D0A6E58-6DC3-44B6-82FC-1CE95D0C6F3E.jpeg
 

Runstenen

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Haha! Ok... Did you NOT look at the link I sent you...
I have to admit i didnt really .. Thanks anyway.
IF you ARE in 7a..(but you are NOT). All your trees will be fine without protection..
That’s great. Since i have 3 options for off season storage with or without heaters, i feel pretty safe. Coldframe, Shed & Indoors.
So If you are confident that you are 7a... Even though you have a Chicago climate... Well ... You MAY run into some issues.
This map says inbetween 7 and 8 🤷

This says 7a 🤷😂

Also found this ( translated )
”According to Leif Klingström's website (see below), southern Sweden's coastal regions correspond to zone 7B acc. USDA Hardiness zones”

Issues is my middle name haha. No but i understand that i have a wire variety of species w different demands. 👌🏻🙏🏻

I am not trying to be rude..
I know. Im grateful for your time sir !
But I am, effectively, somewhere between 4-5 USDA... And I'm warmer than you in summer... Your winters are in between Chicago (Zone 6) and My own (Zone 4-5)...

USDA is pretty difficult to equate to other continents...

But Zone 7, here... Is Like Charlotte, North Carolina...

Here is Stockholm, and Charlotte... Compared.

Remember that Charlotte... Is FOR SURE zone USDA 7..
Quite different.

Here is a screenshot of ONE of the analysis the site provides. (If others don't want to click in)
 

Leprous Garden

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Well the answer seems clearly to be that European hardiness zones are different. In US, zone 7 means the average annual minimum temp is between 0°-10°F (-7°- -12°C), zone 6 is -10°-0°F (-12°- -23°C) and zone 5 is -10°- -20°F (-23°- -29°C). Again this is the AVERAGE ANNUAL MINIMUM, a one sided (but very helpful) measurement of climate. I would think Sweden must be colder than zone 7.
 

HorseloverFat

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Well if you HAD looked at the link.

You'd notice me comparing your climate to actual USDA zones ... IN the US.

It is always SUPER difficult to effectively "translate" USDA onto different continental climates.

Because USDA criteria is termed/defined by average annual minimum temperature... Divided Into 10dF "sections".. (Zone 7a is -17.5 through -15dC)
And while sometimes these criteria are barely met, while the REST of the climate tells a different story.
If your average minimums fall under that category, I guess you ARE Zone 7.... 🤓
 

HorseloverFat

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Well the answer seems clearly to be that European hardiness zones are different. In US, zone 7 means the average annual minimum temp is between 0°-10°F (-7°- -12°C), zone 6 is -10°-0°F (-12°- -23°C) and zone 5 is -10°- -20°F (-23°- -29°C). Again this is the AVERAGE ANNUAL MINIMUM, a one sided (but very helpful) measurement of climate. I would think Sweden must be colder than zone 7.
Haha! I was typing something similar at the same time!
 

Runstenen

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Well if you HAD looked at the link.

You'd notice me comparing your climate to actual USDA zones ... IN the US.

It is always SUPER difficult to effectively "translate" USDA onto different continental climates.

Because USDA criteria is termed/defined by average annual minimum temperature... Divided Into 10dF "sections".. (Zone 7a is -17.5 through -15dC)
And while sometimes these criteria are barely met, while the REST of the climate tells a different story.
If your average minimums fall under that category, I guess you ARE Zone 7.... 🤓
Great. Again i applaude you for your time and effort to help me 🙏🏻👏👍
 

Orion_metalhead

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I wouldn't worry about the hardy trees in a 7a climate. I am 7a here in NJ - basically same as you - and I let my trees full freeze if they are hardy. The only ones I give any protection to are tropicals. Deciduous and Conifers are all pretty resilient in a 7a climate with temps not going below 20Deg consistently. We get down to zero here and with the trees on the ground, pots surrounded by mulch, I have not lost anything that wasn't already dying the previous year.
 

Frozentreehugger

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Here. Is the master winterization . At work tree is native red pine 3 years old left on a 2 foot high bench . During winters first large snowstorm . Side of snow mound knocked away . Notice how the leader is bent over to the ground . Needles are folded against the stem . The sensitive young stem and trunk . Are protected from touching the snow and possible ice build up . So rounded by a air space . Tree is bent over and branches are all the same . Forming a similar air space around the trunk base .
 

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Runstenen

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Stockholm / Sweden / 7A
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7A
Here. Is the master winterization . At work tree is native red pine 3 years old left on a 2 foot high bench . During winters first large snowstorm . Side of snow mound knocked away . Notice how the leader is bent over to the ground . Needles are folded against the stem . The sensitive young stem and trunk . Are protected from touching the snow and possible ice build up . So rounded by a air space . Tree is bent over and branches are all the same . Forming a similar air space around the trunk base .
A pine with routine and mileage from just 3 years. Mother natures evolution is nothing but stunning !!! 🙏🏻
 

leatherback

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I would agree that Stockholm probably in the USDA 7 range looking at temp profiles (https://weatherspark.com/y/84156/Average-Weather-in-Stockholm-Sweden-Year-Round). As far as I know, the USDA looks at long-term averages and then the minimum temperature reached in winter. The scale developed to describe which plants could be grown outside where, afaik. WHich would put stockholm in a similar range as where I live. Thank the warm atlantic current.

This is what I do. Maybe something to watch?
 
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