Does anyone know what the plant toward the centre of the picture is. I've had a few of these in a new, previously neglected and overgrown plot I've cultivated this year.
I've pulled most of them but kept this one for an ID. None of them have produced flowers, yet.

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Could be Hesperis matronalis. Sweet Rocket. But as you say, nondescript. It's a biennial, the flowers will be next year, pretty and well scented especially in the evening
In the sticks near Peterborough
I agree, it could be Sweet Rocket - I get plants like that appear in the veg patch from time to time if I cut back the plants in the border, put the stems and attached seedheads in the compost bin and then the following year spread the compost on the veg patch.
If I spot them when they're small enough I dig them up and transplant them into a flower bed - however once they get to the size of yours they've usually developed a longish tap root and don't take to transplanting, so I leave them in the veg patch - the flowers attract pollinators after all 
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Thanks for your replies. I think your probably right. I have both honesty and sweet rocket in the garden but the sweet rocket has finished and been overwhelmed by shasta daisies so I couldn't check the leaves.
I also thought that sweet rocket has a heart-shaped leaf similar to honesty but looking at Google images it seems that's not always the case, and may just be the basal leaves, or early leaves when it is.
I'll add the photo to my ID folder and shall have to be more circumspect when pulling possible undesirables in the future.
Last edited: 08 August 2016 11:35:10
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Lovely. What are the palnts with the heart-shaped basal leaves in the middle of your plot. Are those veg or something else?
Pattypan squashes - just two plants
Taste like courgettes, more tender, lovely roastedas well as cooking like ordinary courgettes. Very productive and interesting to look at.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Wow!