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internal tree pits

Posted by Daniel Wilkinson , Mar 16,2007,17:09       Forum

Hello. I am working on a college scheme in Bradford where we have 2.2m x 2.2m x 1m depth tree pits set within an internal atrium area. The tree pits are formed with a concrete wall and base with drainage through to the building sub-base. I am wanting to plant 4m high Cordyline australis trees within the tree pits.

I am unsure of what should constitute the exact make up of the tree pit itself ie. Should I just fill it with 1m depth of topsoil? Or should there be a gravel layer at the base of the pit to aid drainage? If so what depth should this be? I am worried that if I just fill the tree pit with 1 metre depth of topsoil that the soil may turn anaerobic due to compaction? If I have a gravel layer at the base would this leave room for the root system of a cordyline to develop properly?

Any help on this matter would be gratefully received.

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