Measure the growing width, not the strip
Check the usable soil between paths, walls and existing roots. A border may look a metre wide while much of that space is dry beneath eaves or occupied by a hedge. Mark services and areas that must remain accessible. Note where people naturally step to reach windows or taps. These constraints determine the real planting width. Record them before choosing plants, because a narrow border offers little spare space for correcting a shrub that eventually proves much broader than expected.
Choose vertical accents carefully
A few upright plants can add height without requiring a continuous deep background. Check their mature width and support needs, not just their flower-stem height. An airy seasonal accent may allow views through it, while a dense evergreen can make the strip feel like a barrier. Place temporary stakes to test the height from nearby paths and windows. Avoid a rigid sequence of tall plants along the entire back edge; selective height often leaves more room for the middle and front to be seen.
Use fewer, clearer groups
Choose a restrained set of compatible plants and repeat small groups where space allows. Many unrelated single plants can make a narrow border resemble a display shelf. Let differences in foliage and flower shape provide interest without requiring a large collection. Draw each plant's mature footprint on the plan, then check whether the intended gaps still exist. Young plants can be supplemented temporarily with suitable annuals, but keep those fillers distinct from the permanent spacing so the border is not designed around its first summer only.
Protect the edge and the view
Keep a clear walking line and avoid relying on constant clipping to make the plants fit. Allow a little soft overlap in selected places while leaving some edge visible. Photograph the border lengthwise as well as straight on; crowding often appears more clearly from the end. If one plant dominates, relocate or replace it at a suitable time rather than repeatedly cutting it into an unsuitable shape. Generosity comes from plants having room to express their form, even when the total planted area is modest.
A little further reading
Match these general notes to your plant variety, climate and local conditions.
