Droopy Goji

[Sonata]

I bought three yearling goji berry bushes from ebay and potted them up in large pots. I've read that they like lots of direct sun, so that's what they get. However, they're all droopy and wilty as if I haven't watered them (I have - and apparently they're able to withstand drought anyway).

What can I do for them? They look so sad and unhappy. They're in a good potting mix thing, plenty of space in the pot, lots of sunshine. I've put stakes in the pots to give them support...