This has appeared in this forum before: Nicandra physalodes - https://https://www.shootgardening.com/forum/topic/view/topicid/22277 (https://www.rhs.org.uk/advice/Profile?pid=538)
How strange :-) My suggestion was a blue flowered Hydrangea, perhaps Hydrangea serrata 'Diadem', but only down to -15. Many Hydrangeas turn pink in alkaline soil so you have to choose carefully. Below -15 you could plant Buddleja davidii.
Use a stick/peg and string to create 2 arcs of circles that just touch each other to form the S shape. It would be best to draw these out accurately on paper first so that you can plot the centres of the circles accurately in your garden.
It looks like wisteria and all of the many cultivars of W. sinensis, floribunda & brachyglottis flower in spring and early summer. Some cultivars flower a little into the summer.
No, it's not comfrey; it has a more rounded leaf and about 30cm long; it is also not in flower at the moment whereas the comfrey is (except the seedlings I have grown from seed this year to have my own patch for fertiliser soup :-) ).
This plant is difficult to kill and is spreading around a dorset village. It have large (30cm) leaves and is growing in woodland, hedgerows and sunny banks.
This is the perfect time to dig it up as it is still cold and showery, just make sure you dig up enough roots then separate them and replan 0.5m apart in soil with added compost, if you then mulch with chopped bark or mushroom compost it will reduce the weeding you have to do. Water heavily each week to give them a good start.
This looks like Arum italicum 'Marmoratum' which is a lovely plant for shade. Just spread them out if they are choking other plants as they have lovely orange berries in the autumn as well as the beautiful marbled leaves.
I have a client who has tried unsuccessfully to kill this plant twice with Roundup, but it still invading his borders and in between the paving slabs. Please can someone identify it and suggest how to kill it?