Shrubs dying

Last year, I planted a new flower bed with three rose bushes, a Choisya, a Camellia and a Euonymous. The roses are doing absolutely fine BUT the Euonymous has lost all leaves and doesn't seem to be regrowing, the Camellia has turned completely brown and has sprouted some small buds but no flowers and the Choisya lasted well but has now started to droop, although is sprouting new growth. All were well fed and watered regularly after planting and didn't show any signs of problems until winter, they are planted on the inside of a south facing fence but do get some sun in the mornings. What has happened? And can I fix it? Don't want to plant any new beds this year until I know what went wrong with this one!
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Normally these shrubs are tough as old boots and it doesn't appear the ground is contaminated if the roses are doing well. I do know my camellia took about 8 years to get going but I planted it just like a stick.
Perhaps just cut back the bits that are really dead and hope they will recover. And don't give them any extra water unless we have a scorching summer.
Camellia shrubs can sometimes have leaves turning brown due to harsh exposed winds and also in extreme cold and wet conditions. Avoid planting them in an area where there is early morning sun. Newly formed buds can fail to open when there is early morning frost that thaws immediately by the morning scorching sun. Prune off the brown and damaged leaves after flowering or in early summer.
The Choysia sounds like it's shrugging off the damp and cold weather. They will recover once it's warmer.
Try to lay a new layer of mulch (Compost, rotted manure or bark chip) every spring for young shrubs until they mature. Helps to stabilise them through extremes in weather conditions whilst their roots are still trying to settle and form. It also feeds them too.
The Choisya roots have spread and it wasn't pot bound but it still looks very droopy and is yellowing. The ground is very wet so I have put plenty of compost in and around it and aerated the soil around where I can. Not really sure what's happened to that one but hopefully the warmer weather will help it pick up again in a few weeks!
Thank you all for your help!