ID Please?

in Plants
As a complete gardening novice I really ought to start labelling things after planting them!
Sorry for another plant ID request but any ideas what this could be? It's in a half barrel planter, in partial shade and is currently about 35-40 cm tall. Thank you.

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Thanks all. I'll probably have to wait for flowers (if they come) to confirm but after looking at Aconitum napellus (monk's-hood, wolfsbane) on Wiki - I'd better be very careful with it for now!
Not the sort of plants that are generally placed in tubs for sale. I would go with @BobTheGardener suggestion.
We bought a half barrel planter and filled it with a top soil, peat-free compost and perlite mix, with drainage pebbles and holes at the base. We then visited a small independent plant shop and asked for a selection of native woodland species - this included cornus, ivy, ferns and lupins.
The idea was to create a woodland planter as it's location is quite shady. The plant that has grown the most is the one in the photo.
https://www.rhs.org.uk/plants/380/Aconitum-napellus/Details
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
We are growing foxgloves elsewhere too so, as you say, just a case of being mindful of the toxicity of some species.