For some detail on the native trees we use, click on the link to the Department of Conservation's very informative website.
We are not dogmatic about planting natives, and will happily plant exotics and cultivars where the location calls for them. For instance, much of Lola Silcock Park is planted in cherries and maples, and there are several fruit trees on the Meadow Walk. Scattered through various projects, there are citrus and bay trees, and in Ann's Patch there is that lovely autumnal arch of golden elms.
Nevertheless, because of all the seed we gather, and cuttings we propagate, we use more eco-sourced material than might be supposed.