Winter leaf dormancy affected by street lighting

[David Humphries]

I've read about this phenomenon in various books* over the years but not knowingly witnessed it until recently.

 

Here's a good example on London planes

 

 

 

 

 

 

 

 

* The Physiological Ecology of Woody Plants

By Theodore T. Kozlowski; Paul J. Kramer: Stephen G. Pallardy

[Mick Dempsey]

Heat or light?

[Stubby]

Just now, Mick Dempsey said:

Heat or light?

Bit of both at a guess ....

[David Humphries]

6 minutes ago, Mick Dempsey said:

Heat or light?

......radiation !

 

 

like Stubby says, probably both I would think.

[Stubby]

Sodium lamp ?

[David Humphries]

Just now, Stubby said:

Sodium lamp ?

 

No idea

[sean]

The London Plane outside my house reacts exactly the same. Always a cluster of leaves left on the tree that are closest to the street light.