The BBC reports on the growing threat from non-native plants escaping form our gardens and colonising the British countryside. I shan't go any further in summarising the article here, but I will ask the question over what is and isn't natural and native? Plants that are pretty or have other redeeming qualities are selected by humans for their gardens, and this allows them to take over new territories, which sounds like just another aspect of natural selection, evolution and the way the living world works. Our attempts to stop the progress of nature in its tracks seem doomed to fail and just as unnatural as what it tries to prevent! But that's just my naive devil's advocate position.