We have a long garden with very tall Poplars at the end (not ours, thankfully, so we get to enjoy them but not maintain them) The previous owners of our house had lots of bedding plants which are too low lying - I think we need tall plants and shrubs down the sides of the garden as your eye-line goes towards the Poplars. Any suggestions for tall/large shrubs or plants (not a massive budget, as new patio is just about to sink all our garden funds!!) Thank you!