You can put them in pots, but they will outgrow them within a year or so. I know you only put those in earlier this year, so they shouldn't be too difficult to move without damaging the roots - Dig around the base of them with a garden fork first, starting a 9 inches out from the centre and working round. I reckon they'll come out easily enough,but try not to break the roots and keep a good rootball round them. You can do it any time this month up till mid October, but water well in their new positions.