invasive | The Ranger's Blog

GB Non-native Species Secretariat offering free online courses

If you’re interested in non-native species and their impact on the environment, and you’d like to learn more, this is the thing for you.

One of the very few parts of environmental work that the government has not cut back on recently is the focus on non-native invasive species. In fact, the establishment of the GB Non-native Species Secretariat has given considerable momentum to ongoing work to understand and control the species of animal and plant that cause problems when they spread invasively in the wild. Typical species that hit the headlines include Japanese knotweed, American mink and Himalayan balsam. But there are many others and lots to learn about them – like floating pennywort (shown above). Continue reading GB Non-native Species Secretariat offering free online courses

Smearing toads with haemorrhoid cream… humanely

Regular readers will remember the anguish with which celebrities and commoners alike rallied round the cause of poor old introduced hedgehogs in Scotland, hard-pressed by conservationists bent on their eradication.

Now an Australian comparison has arisen. Let’s see if Sir Paul McCartney steps forward once more, in defence of the cane toad! Yes, this deeply unpleasant creature, introduced in 1935 and wreaking havoc ever since, is the object of extraordinary hatred by, it seems, all Australians. No Australian societies exist to stand up for the rights of cane toads, and nobody is offered any bounty to cane toad rescuers. Instead, we get the robust Aussie response of “Not In My Backyard Day”, which is sponsored by the Northern Territory government. Continue reading Smearing toads with haemorrhoid cream… humanely

Ivy on trees… kill it or cherish it?

At this time of year our thoughts turn to holly and ivy… and sometimes we encounter one of the ‘old chestnuts’ for debate that just seem to go on and on. Is ivy on a tree a good thing or a bad thing? Should we take ivy off trees, or leave it on? The world seems to be divided sharply into two on this matter. The Ranger, for what it’s worth, is firmly in the ivy retention camp. I well remember a Christmastime some 15 years ago when on my rounds in the woodland I managed I encountered the work of an ivy vigilante. Some clever dick had gone along the woodland ride and cut about 10cm out of the big stems of ivy on the oak trees, killing dozens of ivy plants. I was furious, and for years afterwards the dead ivy lurked in the oak branches, accusingly. Of course, it grew back, but that’s not the point. Ivy provides good shelter and food for wildlife, it is a native plant, and it does not harm trees. No, it doesn’t. A weak tree may succumb to ivy infestation, but this is because it was on the way out anyway. It’s also nigh on impossible to get dead ivy out of a tree.

So why do people hate it so? My theory is that it’s a gardening thing. Of course, in a formal situation, such as a park or garden, it’s quite proper to take ivy off trees. Indeed, because ivy is so successful as a plant it can certainly be seen as a weed in some contexts. So gardeners and those who like tidy gardens, like to remove it. The problem comes when they extend this principle to natural and managed woodlands, and assume that ivy elsewhere is also a problem. Not so. I’m happy for gardeners to pick off as much ivy as they like – in a garden. But if ivy is a weed in one context, it cannot be assumed that it will be so in all others. So please, if your secateur trigger finger is itchy, don’t go into your local woodland and cut the ivy stems imagining you’re improving matters. Clip off a few jolly ivy boughs instead, decorate your home this Christmas with this fine, festive plant, and learn to enjoy it in its place.