The last part of the Tree event on Saturday was the film at 7pm, The Secret Language of Trees.
The Parish Hall was full, and the film was fascinating.
It talked about how trees can communicate with each other through their root systems, exchanging chemicals with other trees nearby to warn of predators so that the other trees could defend themselves more quickly, and about how the shared root system could keep stumps of felled trees alive. The trees also share nutrients to help weaker trees, and can "decide" together when it's a good year to produce lots of acorns or beech mast or other seeds. (This year has been a very good year for acorns locally - they were everywhere on the Offa's Dyke walk.)
They also talked about "mother trees", which are important to the health of a lot of other trees around them, and how plantation firs or other evergreens do better if there are birch trees in the mix. They talked about using horses to pull the felled trees out of the woodlands rather than heavy machinery that compacts the soil, and lots more.
There were scientists and tree experts from Canada, including an indigenous woman who is also a scientist, who talked about the importance of indigenous knowledge of how their local forests grow, and a forester from Germany, talking about how German forests are managed.
After the film there was a Q and A session with four of the trustees of Botany and Other Stories, and the son of one of the trustees, who is also, I think, a soil scientist.
They spoke about the importance of sourcing local trees or seeds to replant woodlands - one of the problems of sourcing the cheapest trees from abroad is that they can import diseases, like Dutch Elm disease. Also, they are less likely to be well adapted to the local conditions if they come from the other side of Europe.
In the Midlands, the National Forest scheme is trying to link together scattered patches of woodland, which will be good for biodiversity as animals, plants and birds can move more freely between their habitats.
When talking about commercial forestry, they agreed that monocultures are a bad thing, and selective felling of mixed woodland is better, though they were doubtful of the possibility of scaling up horse power to commercially viable levels.
A Swedish lady who has recently moved to Hay talked about her time living in Scotland, where she had seen selective felling of trees targeting the trees described as "mother trees" in the film, which is very bad for the health of the woodland.
They talked about the need for long term planning, and for forestry and agriculture to work together - hedgerows are very important for biodiversity, for instance. Leading on from the walk in the afternoon, they talked about the need for sensitive intervention in woodland - you can't just leave trees to do their thing, because woodlands in the UK have been subject to some form of management for centuries. There is also the problem that about 75% of woodland in the UK is now privately owned - state owned woodland has quietly been sold off bit by bit. So where once the Forestry Commission could implement a policy across the country, now there has to be a lot of negotiation with private owners of woodland.
And it's no good just planting a bunch of trees anywhere - around Birmingham there is a lot of heathland, a valuable habitat in its own right, which is destroyed when trees are planted on it, and it's not the best place to put the trees, either.
One of the trustees said she had been working in the sector since around 1978 - and things were improving, but there is still a long way to go!
So there was a lot to think about, coming out of the meeting, and a lot of expertise on the board of trustees of Botany and Other Stories. It's quite reassuring that people with that expertise are getting together to do positive things.