Yesterday I became part of the Lower Mainland Green Team, a group of people from all over the Lower Mainland BC who get together once a month to help an environmental group, non-profit organization, charity or city tackle an environmental issue that needs co-operation and teamwork to get done. A common task is to remove invasive plant species. Over time many species have been brought to Canada that dominate areas and cause native plants to die. Ecosystems can change because of the plants and they can really adversely affect habitats.
A glorious day yesterday took us to Delta Nature Reserve, helping a local group tackle an English Ivy problem. The reserve sits beside Burns Bog, the largest peat bog on the west coast of North America, abundant with unique flora and fauna. Most of it is closed to public as it is a treasured area, and is thought to be a major regulator of the regions climate. The Delta nature reserve is to the east of the bog. Ivy was brought here by Europeans as an ornamental plant. I’m sure our ancestors didn’t realise the impact it would have on some habitats, but it can grow in dense patches, form a thick ground cover that suppresses native tree seedlings, and engulfs and kills lower branches of trees due to heavy shade. The extra weight of the vines and evergreen leaves causes the host tree to be much more susceptible to blow down from winds or heavy rain, snow, or ice. It may also harbour a plant disease called Bacterial Leaf Scorch, which harms elms, oaks, and maples. Without its natural predators to keep it at bay, ivy has gone for it! So how could we help with this? To pull out as much as we could! After short instruction from the local conservation group, we collected clippers, gloves and saws, and got to it. It was actually very physical, pulling at ivy with all your might. It was hard to get to the roots of the ivy, being a creeper and entwined itself with everything in sight, but very satisfying and therapeutic to get it out. I did feel a bit sorry for the ivy; I’m sure it didn’t intend to cause such trouble as it elegantly glided its way through the forest. It is a beautiful species, and at the end of the day survival of the fittest has led it to it’s tyranny of the other plants. But it really is necessary in this area, taking over everything. Some people worked on the trees, cutting the ivy at the bottom of the tree which would cause the ivy higher up to die. Those of us working on the ground pulled, wrestled, tripped over and rolled up big piles of ivy for 3 hours, by which time we were shattered! The pile of ivy at the end was impressive, but really, we just scratched the surface. However at least it gives plants and trees in that small area we covered a bit of breathing space and some freedom. Meanwhile the massive ball of ivy we collectively pulled out will be picked up by the city and disposed of, and after being compressed will measure about 16 cubic yards.
Actual removal of invasive plants is very important, but so is preventing their spread. Many invasive plants including ivy are still sold at garden centres, and even if just in people’s gardens the berries can be eaten by birds and passed through without damage, to far away places not expecting an ivy invasion! Thankfully there are groups including the Invasive Plant Council of BC who encourage people to get involved in tackling the problem, and work closely with the Lower Mainland Green Team.
Unfortunately there are no more removals in August but we will be back in September at the Pacific Spirit National Park for more! Until then I might have a look around my garden and see if there is any ivy or other contrary collections not quite where they should be, and maybe you should too :)
Ivy pile at end :)
Before
After
A walk in Burns Bog afterwards