Trees/shrubs that deter grass? Help, anyone?

 My Mum has a Callistemon citrinus growing at her place and for years,
she's failed to get the lawn to grow beneath it. Recently, someone told
her that C.citrinus actually deters the growth of grass and other plants
in its shadow.

What a scathingly brilliant idea!

I'm not particularly fond of C.citrinus (I'm allergic to the hordes of
bees that come in the spring), but I wondered if anyone knows of other
trees or shrubs that will deter grass like this? I'm after anything that
will really result in bald ground if possible.

Anyone know of anything?

--
Trish Newcastle, NSW, Australia

 

Don't notice much weedy growth under pine trees or casuarina trees. Anything
that has a dense canopy usually deters growth under it.

 3 inches of concrete?

Trish Brown wrote:

 Trish Brown wrote:


Any largish tree usually competes with the grass and ensures slow
growing until some idiot decides it needs fertlizing and watering {:-(.

but as others have said, a mulch layer with selected weeding is the main
requirement for removing it.

 On Wed, 14 Nov 2007 21:14:44 +1100, Trish Brown


Its gone now but no grass grew under my Wattle tree


Regards
Harold

Tantum religio potuit suadere malorum - Lucretius