 Re: Failed Poinciana Redland Shire Brisbane
Yep,
You know, I guess those "islands" for the trees to grow in are on top of some inhospitable compacted sub base.
The soil in the islands dries out quick and has "no body" or volume, like a mixture of sand and bark fines.
The roots would have to try to hang onto the sub base coz you aint getting much anchorage out of that planter.
Of course being elevated means 2 things.
1/ You dry out quicker or
2/ Your deeper roots drown in a well of water.
Either way there would be little soil cohesion so lots more emphasis on strong roots.
The trees are small though, fairly well protected from weather and the tree that fell .... it was not a windy day.
What do you think is under those planters?
Do you think the roots will go under the road and pavers?
I think for the type of hardscaping presented, that the choice of tree was poor.
Poincianas have low canopy and wide spreading, buttress roots and poor compartmentalization.
I'd be looking for a tree that would grown maybe 5m tall and no more than 5m wide, drought and good tolerance of poor soils, drop no big seeds like Leopard trees do.
Now lets see, some I can think of are Buckinghamia, Waterhousia, pink trumpet tree ... and I'm sure that there's heaps more. |