GardenBanter.co.uk - View Single Post

®óñ© © ²°¹°-°² · 27-02-2008, 05:34 PM posted to uk.rec.gardening

On 26 Feb 2008 10:05:36 GMT, (Nick Maclaren) wrote
and included this (or some of this):

In article ,
Broadback writes:
|
| Just curious. As I understand it the evaporation of moisture is what
| draws the sap from the toots up the tree. Does this mean that the sap
| does not rise until the leaves unfurl? If so where do the leaves obtain
| the energy to be "kick started"?

'Tain't so. Sounds plausible, until you think about it. If that
were so, how would the sap reach the top of a 50' tree? Even a
vacuum will raise water only 30'.

Then try Osmosis. It's very powerful, and not limited to 30'

http://en.wikipedia.org/wiki/Osmosis

--
®óñ© © ²°¹°-°²