Sad looking acer

We had a young acer in a pot over winter. A couple of weeks ago it was looking all perky and happy. Then we transplanted it straight into the soil. The soil was treated with sulphur to lower the pH, but only in line with the recommended quantity so I'm not convinced that's the issue, but now the acer is looking very sad. It looks like it needs a good drink, and I'd expect a bit of wilting for a few days as it settles in, but it's had plenty of water, and it's been over a week. Other plants that prefer acid soil that went in at the same time seem happy enough.

I'd take a pic but it's soggy out there today. Any ideas? Is it likely to pick up or is there something I should do?

 

Some one was asking a similar question a few days ago but cant find the thread now.

 

With the weather all over the place perhaps it needs more time to settle.

 

Did you check the compost in the pot for grubs? Acers in pots are very vulnerable to vine weevil grubs over the winter. They eat the roots. The Acer appears to be growing in the spring, but then starts to wilt as the reduced root mass is unable to sustain the new foliage. No cure, as the roots will struggle to regrow. Prevention with nematodes in the autumn is the best policy.