"Jonno" wrote in message
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"FarmI" ask@itshall be given wrote in message
. au...
"0tterbot" wrote in message

having said all that, i read recently (and i can't remember where!) that
longstem planting is surprisingly effective for more trees than you
would think,

It was certainly featured on one of the Gardening Australia programs.
amazing really as it goes against the grain after all those years of
being told to plant at the level the plant was in the pot.

They also said it may not work for some trees.
Casuarinas sound pretty tough trees so I wouldn't worry...

See here http://en.wikipedia.org/wiki/Casuarina

This part would worry me though if you built a garden bed under or near it
The plants are strongly suspected of having allelopathic properties, as
evidenced by the near absence of understory once a mat of litter
develops around the plants.
Allelopathy is a biological phenomenon that is characteristic of some
plants, algae, bacteria, coral and fungi by which they produce certain
biochemicals that influence the growth and development of other
organisms. The biochemicals, called allelochemicals can have a beneficial
or detrimental effect on neighbouring organisms.