Leaves look a bit like a very gangly Acanthus.
Hopefully some one will identify it for you.

Bear's breeches = full sun. So it was in completely the wrong place. Thankyou gives me an idea of where to replant it!
sandy

Bear's breeches = full sun. So it was in completely the wrong place. Thankyou gives me an idea of where to replant it!
sandy

Bear's breeches = full sun. So it was in completely the wrong place. Thankyou gives me an idea of where to replant it!
sandy

If it is acanthus you can grow these from root cuttings. Look it up if you have never done it before, it is really simple and you can also do it with oriental poppies.

The stems look very smooth for acanthus. Why not wait until it is upright again and then post another photo of it. If you crush a leaf does it have a celery smell. If so it could be lovage.

Thankyou but I think lovage has prickly stems!
great idea to try root cuttings. will have to look it up.
Sandy

No Sandygirl lovage has smooth stems. The reason I asked if it has a celery smell is that lovage is a herb used in soups etc in place of celery and you can use the leaves in salads. If you want to take root cuttings as Trees says it is very easy and best done in the winter. Unearth a bit of root. Cut it in inch long pieces and put it in compost in a cool greenhouse or cold frame.

Don't think this looks like lovage, unless there are several varieties.