Plants or trees for screening

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My neighbour has been building the world's ugliest extension for the past 4 years. The latest addition is huge black chimney, which I presume is for a wood burner. Our rear garden backs onto the side of their garden/ugly extension & we are therefore looking at this monstrosity daily, does anyone have any recommendations for screening it out? We certainly don't want to put up leylandi hedging but would like something to help block it from view.

Sorry to sound like such a moaner but have spent a lot of money on landscaping our garden & now we are looking at having to redo part of it to hide this thing.

Nice tall grasses, and black bamboo (not other bamboos, which can be too invasive) are effective, as they are there most of the year, and make a gentle screen, but not impenetrable.

www.ornamentalgrass.co.uk/

www.rhs.org.uk/plants/details?plantid=1286

www.rhs.org.uk/plants/details?plantid=1883

www.bbc.co.uk/gardening/plants/plant_finder/plant_pages/889.shtml

Check out different heights etc, and different variations. The above are just a few of the hundreds available. They make not look much at first, until they send up flower spikes next summer.

Alternatively, if you wanted to put up a trellis or framework, you could have various kinds of clematis.

Ok thanks for your suggestions I will have a good look at them.

My favourite screening tree is Acacia pravissima. Evergreen, so it screens all year, quick growing with a beautiful frondy habit, and beautiful yellow flowers in spring.

It doesn't like cold winds though, so if it's an exposed site or up north it might not be very happy.

this is really useful as I will need exactly the same things soon but just wanted to say the house I've just bought has sections of black bamboo and I love it - some of it is close to my bedroom window and it looks so great when it moves. Just thought I'd add as I know bamboo sometimes gets bad press.

Really appreciate all the responses which I will be researching over the next few weeks.

I've just put together a screening action plan!
I've got a cluster of very small growing trees which are fastish growing:
late cotoneaster
Portuguese laurel
Strawberry tree (poss not that fast growing)

And some climbers, mostly evergreen but not all

Chocolate vine
Chilean potato vine
Two clematis, one evergreen, one not.
Climbing hydrangea

I'm also going to grow hollyhocks, lupins and some grasses I think.

Grasses that I am investigating are
Stipa gigant switchgrass warrior and heavy metal
Feather reed grass or miscanthus malpartus
Sporobolis h.
Deschampsia
Helictotrichon sempervivens

I may add a skyrocket conifer too.
For really quick tree cover I looked at eucalyptus but decided against as it might damage the garage wall (which is the thing I'm screening).

I've only just planted this lot in autumn so am not sure how it will all do.
Oh I've got a passionflower too.