Give them a couple of days, & if they're in direct, glaring sun, shade them until they're established.

I transplanted some sizeable lantana this summer & they not only wilted but lost almost all their leaves.

Now they're growing well.

Sometimes fertilizing new plantings or transplants overstimulates & stresses them.

Compare yourself to a heart surgeon who's just done a transplant.

You let the patient be groggy & slow while he recovers, & you probably give him a liquid diet & no stimulants.

You don't say, "Hmmm...This patient isn't very perky. Think I'll give him a handful of diet pills!"