Jun, Jul, Aug
Before planting, put the trough in its final position and stand your plants alongside it. This will help you work out which neighbours work best together and give you an idea of planting distances.
Place a layer of broken pots along the bottom of the trough to provide good drainage. Puncture holes in the trough to allow water to drain away.
Empty bags of compost into the trough until it is two-thirds full. Firm it as you go.
Plant the largest plants first to give you a good idea of the main structure of your container. Bear in mind how big some of your plants will become before you place them in their final positions.
Fill in the gaps with smaller plants, varying textures and colour. Pendulous grass needs to be near the front to allow it to cascade, but bushy plants can be added to the body of the planting.
Plant everything firmly, ensuring the plants' crowns are level, then top up with compost. Water well and if some compost settles, top it up again so the surface remains level.