The rose and the astilbe look fine to me, new foliage often has a yellow or bronzy tinge. Astilbes like damp soil and some shade. The primroses have finished flowering and will die bac a little to a rosette of leaves. They also appreciate a little shade and don't like to dry out completely. They will flower again next spring.
The pieris though looks like it is suffering - the yellowing could be because of the wrong compost or lack of nutrients or too much sun exposure . It needs acid soil and as it is in a pot it will need ericaceous compost. It would probably be happier in the ground as long as your soil is not too alkaline - you will need to do a soil test to find out, or ask a more knowledgeable neighbour. It also likes shade for a good part of the day. If you can repot it and give it a little TLC, it will reward you with brightly coloured new leaves through spring and summer, stay evergreen in winter and have bunches of creamy white flowers in spring.