Privacy plants in smaller volume planters
(San Bernardino CA)
Sedum 'Autumn Joy'
Hi, I've made some planters to sit on top a block wall to obscure the junk my new neighbors keep in their front yard. The planters are made of composite decking and are 5.5" wide X 4.5" tall X several feet long. The plants will get plenty of sun and I can put them on a drip line too. What would be good that would grow thick, high, and last many years? I could make them 9" tall but I'm hoping 4.5" will suffice.