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thin, frondy plant to block overlooked spot.

I'm looking for a tall, long, thin plant/tree to fill a space that is over looked in my garden. It would be something like a small silver birch, except I'm very allergic to the pollen. Like a bamboo, but I don't like bamboo. Like a tall thalictrum. I have planted tall sunflowers there before, and this summer I am trying tall dahlias in a pot in that spot, which could be quite fun, but I'd like something more permanent. It will be between tight between an espalier apple tree along the fence and a rose arch. Something frondy would be good so that it doesn't block too much light. Any ideas please?

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Maybe a bit boring in summer but you might be able to grow a Group 3 clematis up which you can cut hard back in autumn.
Failing that would a tall obelisk or pillar with a rose or clematis work?
Not very frothy / frondy though...
A good trick to get extra light into your garden once the space you want to obscure is covered is to lift the crown of the tree or shrub by removing the lower branches. I do this to most of the trees in my garden including Rowan, Whitebeam and Catalpa.