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We try to record and collect data about interesting plants (which grow or may try to grow) growing in an area where the winter temperature falls as follows 0 to -5 C and -5 to -10 C and maybe in the glasshouse 5 to 0 C, i.e. just above freezing. Since 2017, when we moved to Ven the minimum temperature was at - 5 with a one-night "bottom" -11C
(we are purely non-profit, non-commercial, pure hobby)		    

 

 

 
 
PLANT 		STATE temp
 protection/ other growing conditions rapporteur
and photo origin
           
Dicksonia Antarctica  May be an image of outdoors and tree leave damaged
may recover 		 -7 in a yard  Suzanne Porter
           
Schefflera schweliensis
stems squidgy -9 against a wall but in pot Sean Barton
Manchester
dec 2022
           
Fatsia megafatsia OK -9 in pot Sean Barton
Manchester
           
           

 

 

data from United Kingdom from Mike Collins, in process of collection
    

 

Irland, will come    

 

SWEDEN, Ecolanum's Ven, and other locations in Sweden

 

December 2022, the cold spell period, 13 days below zero,  almost no wind, humid during the days,

 

The cold weather did not affect any  of the following plants (sensitive for the low temperature)
- figs
- Fatsia Japonica
- Eriobotrya japonica
- Ceanothus thyrsiflorus
- Bamboo, all "standard" genus
- Cornus carlesii - leaves stay on

 

our assessment is that our location on the island of VEN judging by temperature only could be classified as USD zone  hardiness 5-8, In reality the survival of plants depends on
- degree of protection from winds, very strong winds from the sea
- In spring,  the temperature, during long periods, oscillates  between+10/-3 within 24 hours
- cold and deferred spring, warm and long fall.


Soil on Ven: at Ecolanum mostly clay

 


PLANT 		  STATE   protection/ other growing conditions rapporteur
           
Podranea Ricasoliana
See the source image
Died 2022
probably the roots froze, the bark can be peeled off easily		 -3 put in a barn for protection  
           
Magnolia Grandiflora   OK
gets flowers		 -11 C  a house as a protection, 5 m away, from east Ecolanum 
           
Tetrapanax 'Rex'   recovers from roots -20 C    Ludvig Johansson
Skövde
           
Paulownia fortunei   flowers -20 C    Ludvig Johansson
Skövde
           
Castanea sativa   no flowering -20 C    Ludvig Johansson
Skövde
           
 fig   no problems
fruits		 -11 C  protected  from 3 sides Ecolanum 
           
oleander   died
2020/21		 -11 C  from one side Ecolanum 
           
Fatsia Japonica   died to the ground
2020/21		 -11 C  not protected, was flooded some period Ecolanum 
   
Arbutus indeo   gives fruits -11 C  one side, wooden fence, west Ecolanum 
           
Castanea sativa   no problems
fruit after introducing the second tree		 -11 C  not protected Ecolanum 
           
Paulownia Tomentosa   flowers and fruits/seeds -11 C  not protected Ecolanum 
           
Paulownia Tomentosa   flower, fruits   protected, in a town squere Malmö 
           
Paulownia Tomentosa   OK -20?  protected by houses in the courtyard Ebba Sigfridsdotter
Uppsala
           
Ceanothus thyrsiflorus, evergreen   suffered frost burns
2020/21		 -11   protected by a fence from one side Ecolanum 
           
Ceanothus x delileanus 'Gloire de Versailles'   the thicker branches survived -11     Ecolanum 
           
Ceanothus x delileanus 'Gloire de Versailles'   died to the ground -20    Vienna 
           
Tetrapanax papyrifer 'Rex'   died -11  protected by a wrapping Ecolanum 
           
Eriobotrya japonica   no flowers yet -11  protected Ecolanum 
           
Gunnera manicata   died -11  was slightly  protected Ecolanum 
Gunnera manicata   recoverd from the root -20  protected Vienna 
           
various bamboo   no problms -11    Ecolanum 
           
various bamboo   some suffered -20    Vienna 
           

 

 

 

United Kingdom