Lavender Help

Hi all
Not sure if this is the right place but my daughter brought Lavender 2 lots of 6 and so she got 2 lots of 3 free cost her £45 in total , They came direct with pots so yesterday she potted them and today the ones that were in 3s are dieing and the others don't look good .
any advice . they were put in West advanced plus compost , yes they have been watered lol

 

I wonder if they had previously been too dry over a period.

Did you by any chance pot them dry and then water? It might not apply in your case but a plant must never be potted up or potted on with dry roots - water throughly, leave to soak in for an hour or so and then pot on into a moist medium.