Do you know the name of the variety you planted? Unless it's Purple Pixie, they are likely to get much too big for that space. Yours don't look like PP to me, but if they are, they are known in my area to struggle for the first few years.

Oh no they are Changs Ruby. I will definitely give the root stimulant a try. I'd hate to have to purchase new ones. Thank you

info that I am reading says 5' wide by 5' tall. You might want to move the center one out of there.

I love loropetulums, but they tend to grow quite a bit larger than the labels and information indicate. You may want to research that variety a little more closely to ensure they will stay small. A little fertilizer will probably give the struggling one a boost.

Molly

Mine became a 12' understory tree. It was beautiful.

they don't respond well to overwatering. also, just before they become spectacular, they always seem to look kinda bad, like discolored. do the finger test around ea root base to assess moisture situation and modify as needed.

Summer scorch. I planted mine in April and they look like that now. Some others that were planted three years ago look great now.

Here is a loro, tree-like.

both, tree & short shrubs are faded but will get beautifully dark between now and spring.