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I have a narrow (varying from 18 inches to 36") border between a 5ft fence on one side and paving and grass (edged with pavers) on the other. Is there any shrub or small tree that I could plant in this space without detriment to the plant or the landscaping?

Box balls,  a bay to clip and shape. or if you just want to fill a space quickly use Acanthus, (bears breeches)

It depends very much on the soil, the aspect, amount of direct sun and where you are as those will determine what you can grow and how hardy it needs to be.

if its north facing a nice cooking cherry fan any other aspect apple or pear espalier or for a shorter option a nice red windsor apple stepover hope this helps

Thanks, I'd been thinking of an espalier fruit tree but worried that the roots might cause trouble under the grass/paving?

No.  It'd be like a larger bonsai with a limited root run cos of the trained upper growth.  Also, to get good fruits you would presumably feed and water well so the roots wouldn't have too far searching for goodies.

An acer of some sort would fit in (just) but otherwise look for herbaceous or shrubby plants.

Quote from: Obelixx on April 28, 2019, 18:19:17
No.  It'd be like a larger bonsai with a limited root run cos of the trained upper growth.  Also, to get good fruits you would presumably feed and water well so the roots wouldn't have too far searching for goodies.

Thanks, that's really useful.