UKTC Archive

RE: Mortality rates

Subject: RE: Mortality rates
From: Chris . Colwell
Date: Dec 18 2003 09:47:47
Our experience at Kensington and Chelsea is that we achieve better than 97% 
success rate by selecting good stock, good planting technique, close 
monitoring of contractor and watering as necessary during first two years. We 
decided not to go for performance based contract, partly due to our success
with existing procedures (if it's not broke, why fix it approach) and 
possibility that contractor may believe it more economically advantageous to 
skimp on aftercare and bear cost of replacements. Our residents do not want 
to see loads of  dead trees, it's bad PR. Having said that I think it
whatever works best in your situation.


Chris Colwell

-----Original Message-----
From: Edmund Hopkins []
Sent: 18 December 2003 08:36
To: UK Tree Care
Subject: RE: Mortality rates

My experience is that when I was with Wandsworth Borough Council the success
rate in streets was better than 98% which is why I was so confused when I
joined Nottingham City Council to find that nearly everything the DLO
planted seemed to turn up its toes and die. I never did get to the bottom of
it but since so little replanting got done due to, well, due to budgets and
the indifference in which trees were held, it didnt really matter that much.
I think A recent post from Jerry Birtles suggested that Wandsworth continues
to achieve high success so they must be doing something right.
I think the key probably has to do with making sure the contractor carries
the cost of failure and to me that is best achieved through a performance
type contract where essentially all you say is what you want at the 2 or 3
year handover.

Incidentally I will broadcast my planting costs when I have awarded, for
general interest, though I've cone for container grown rather than lifted.

-----Original Message-----
From: Chris Hastie []
Sent: Wednesday, December 17, 2003 5:20 PM
To: UK Tree Care
Subject: Mortality rates

What are people's experience of mortality rates in urban plantings, both
including and excluding vandalism?

I'm aware of a 26% figure from Johnston and Rushton, but does any one have
any information to qualify what seems a surprisingly high figure to me.

This has come out of Edmund's question about planting costs - I've gone back
to look at a breakdown of costs and am trying to build in a figure for
replacements, but I need some idea of how many I might have to replace.

Chris Hastie
Strategy Officer (Arboriculture) 
Warwick District Council

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