Narrow Border Ideas
I am struggling with the design of a narrow border in my backyard. The bed in question is about 4' deep and about 15' long. The shape is that of a large half-circle. It wrapps around three 7' tall Alberta Spruces. The front of the bed has a stone wall, about 1' tall, ideal for sititng and admiring smaller flowers up close. The bed is facing south, getting full sun all day, and as it is filled in soil from the pond/waterfall excavation is has good drainage, without being a totally sunbaked and dry bed. I currently have four Miscanthus 'Yakushima' in there, but they are too big and way out of proportion. I'll dig them out in spring. So here is what I would like to put in this bed: groups of tall bearded iris about a foot out from the Alberta spruces, so that the lower branxhes of the spurces don't dy back and create holes in the nice cone shape. Behind the iris and infront of the spruces I would like to plant groups of daffodils for spring flowers. In the gaps between iris clumps and slightly forward I thought of planting Pennisetum 'Hameln'. The front of the bed and closest to the low wall would house Moonbeam coreopsis, Matrona Sedum and groups of low blue and pink asters for fall. My question is, what could I plant to carry this bed through summer? I thought of Phlox, but that may smother the iris too much. What about Gaura butterflybush and perovskia, both would do well next to iris clumps by not shading them too much. What else could I add for high summer color? I would rather not use annuals here as I plan to also include groups of croucs and ornamental onions, and given my short memory I am certain to dig up little bulbs when planting annuals.
Thanks for your thoughts and ideas.