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Leylandii
I demolished the old garage yesterday - a high Leylandii hedge runs the length of the garden and was behind it. Where the garage was its completely bare and lacking in foliage.

Now its exposed to light will it green up ? (I have a feeling Leylandii doesn't perform this trick).
If not, what's is the best way to get this area green again quickly - what would you plant ?
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You're absolutely right about Leylandii not greening up like that.
I'd put posts and big trellis up there and plant a mix of climbers, including evergreen clematis - but you'll have to replenish that soil first and be prepared for plenty of watering - Leylandii are greedy and thirsty.
Which way does that boundary face?
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
North East
There are several clematis that would be happy facing North-east - Nelly Moser is one. Garrya elliptica could be trained up there too. Clematis armandii should be fine there too, and is evergreen. You could also train a pyracantha up there if you don't mind the thorns - all that lot will create a wonderful nesting opportunity for garden birds
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Would those climb directly onto the bare Leylandii or is trellis essential ? - Thanks
I wouldn't try to grow anything up the Leylandii - I don't think it would work effectively - if they grew at all they'd try to grow through the trees to get to the light the other side.
And you want the roots of the climbers a good metre away from the trees, in soil that's had some good organic moisture retaining stuff such as manure and compost dug into it.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.