where are you .. zone and big city .. ah.. england ... might mention that in the future ...

name the plants ...

if zone appropriate ... they dont need anything from you ... unless they are in pots... and then we talk about pots ...

most trees.. NEED to go dormant .. you do not protect them.. unless you are trying to grow some tropicals in GB ... so we need to know what they are ...

this is really an issue for the tree forum... rather than a pest or disease issue ....

i have killed more things.. with too much love in my garden .... we try to duplicate ma nature as closely as possible ... rather than dreaming up all kinds of variables that may or may not be helpful ...

more info please

ken