What plants would last to grow on these tiers? HELP

These tiers are beautiful. If you are trying to avoid having to mow replace the grass with a ground cover like vinca or ivy. You can put in pretty flowering bushes like azaleas, gardenias, rhododendrons, etc. It all depends on how much sun you have and what temperature zone you live in. The ground cover will also crowd out weeds.

Pull out all the grass, put down a good quality weed barrier. Lay down a good coat of mulch or white marble chips. then use large containers, garden statuettes, maybe a few odd pieces, such as an old weathered bench. Then add large containers of annuals for color. Cuts back on weeding and you can change the flowers with the seasons. I did this to my perennial rock garden when I could no longer do the weeding. A couple of flowering bushes could be put in, but usually have a short flowering time.

Ground covers are a great idea. Vinca vine and creeping jenny are medium growers, but once they fill in, weeds have a hard time growing! Daylilies are easy and very easy care. Mulch around them to cut down on weeds. I also think a row of hydrangea would be very beautiful on one of these levels!

Hostages come in huge variety of color and serum, both take no fuss, come back year after year and rapidly enlarge year after year.

Awesome yard! I would smother them with cardboard. When dead, clear out. Lay landscape fabric. Choose plants that are low maintenance and space well. Cut an "X" in the fabric. Top with mulch. Work in early morning or early evening or hire out.

ooooops! meant Hostas and Sedum