Posted: 15/11/2017 at 12:46
And, if those are your neighbour's conifers, why did you let them leave you with such an eyesore?
If you can't get fence posts in it's unlikely plants will be able to get their roots down far enough to thrive. Those conifers will have sucked all the nutrients and moisture out of the soil too. If you can't take them all out for some reason I suggest you try and erect a plastic covered, wire mesh fence with thin metal posts which will be easier to bang in to the depth you need then add the mesh which can be flexible diamond weave mesh or rigid rectangles. Do this right up against the bare trunks or as close as possible.
After a good downpour, pile on a good thick layer of well-rotted manure and leave it over winter for weather, worms and micro-organisms to work in and then plant some good climbers such as clematis, honeysuckle, rambling or climbing roses which can cling to or be tied in to your fence so they grow to cover it.
You will need to make decent planting holes for them to thrive and water and mulch them well. If that's not possible then a mixture of ornamental grasses, verbena bonariensis and other tall perennials and spring bulbs will provide interest and a disguise.