[CANUFNET] tearing up pavement or concrete to plant trees?

Tue Nov 10 04:28:43 EST 2020

I thing it’s important for managers to rethink how funding is appropriated. 

It is much cheaper to have the expenditure front-loaded so that all the essentials required for planning, site prep, tree selection, planting and establishment are addressed in the most tree-friendly way as possible than the cost of having to do more maintenance and have the tree decline and die prematurely. The most expensive tree is the one you replant every 10 - 20 years.

It’s much better to plant fewer trees and actually plan to GROW the ones one does plant so that trees can actually live well into maturity. That’s a far superior canopy..

Just a note - I may be misinterpreting your description of the planting but one should never plant directly into the structural substrate. A tree should always be planted into soil, hopefully one that is pH related to the tree that’s being planted and has an organic component. The paving - be it porous or cement or cobble - should then be installed over the structural substrate. Structural soils should only be used to replace a substrate that has to be compacted to an engineering spec and not as a planting medium.

Naomi

> On Nov 5, 2020, at 4:17 PM, Reny, Robert via CANUFNET <canufnet at list.web.net> wrote:
> 
> I suppose in a perfect world where funding is limitless, these measures can be met. However, with this particular project and budget, we were able to fill each pit with structural soil and cover the surface with cobblestone set in a porous subbase. While we typically install over 4000 street and park trees per year, this project was rewarding given the nature of the original site conditions.
>  
> Rob
>  
>  
> From: CANUFNET <canufnet-bounces at list.web.net <mailto:canufnet-bounces at list.web.net>> On Behalf Of Naomi Zurcher via CANUFNET
> Sent: November 5, 2020 3:54 AM
> To: Canadian Urban Forest Network <canufnet at list.web.net <mailto:canufnet at list.web.net>>
> Cc: Naomi Zurcher <treerap at sprintmail.com <mailto:treerap at sprintmail.com>>
> Subject: Re: [CANUFNET] tearing up pavement or concrete to plant trees?
>  
> Hi Rob:
>  
> The most critical thing is to not just digging out a large pit (hopefully not deeper than the height of the root ball and that the trunk flare is visible) but that the ability of roots to grow out of the planting space is accommodated. This is the most easily accomplished by replacing the existing substrate with a structural soil, covered with either dry set or permeable / porous pavers and that root paths or soil trenches be installed so that trees can connect with neighboring trees, thus further expanding the accessible volume of  bootable soil.
>  
> Kind regards
> Naomi
> 
> 
> On Nov 4, 2020, at 10:18 AM, Reny, Robert via CANUFNET <canufnet at list.web.net <mailto:canufnet at list.web.net>> wrote:
>  
> Hi Grace,
>  
> We recently teamed up with our Engineering Department to beautify an area that was devoid of any street trees. We removed concrete panels, dug out large pits and installed 40 street trees on both boulevards of a section of road. Additionally, rather than installing standard metal tree grates, we installed cobblestones around the base to provide a hard surface area while maintaining a decorative theme. We prefer to use cobblestones in selective areas to allow for the expansion of the root flare. Please contact me for more information.
>  
> Regards,
> ROB RENY | COORDINATOR, URBAN FORESTRY
> 
> 
>  
> CITY OF SURREY
> Parks Division
> 6651 148 Street Surrey, BC, Canada V3S 3C7
> T 604.501.5090  www.surrey.ca <http://www.surrey.ca/> 
>  
>  
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> From: CANUFNET <canufnet-bounces at list.web.net <mailto:canufnet-bounces at list.web.net>> On Behalf Of Grace Golightly via CANUFNET
> Sent: November 4, 2020 12:56 AM
> To: Canadian Urban Forest Network <canufnet at list.web.net <mailto:canufnet at list.web.net>>
> Cc: Grace Golightly <gragoli at gmail.com <mailto:gragoli at gmail.com>>
> Subject: [CANUFNET] tearing up pavement or concrete to plant trees?
>  
> Does anyone know of cities or communities that have torn up pavement or concrete, in order to plant more trees where they are needed?
>  
> I'd appreciate any links to articles or information.
>  
> Thanks,
> Grace
>  

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