I liked this story. I was pretty close to loving it, but I'm not sure how I feel about The Rose. As a metaphor, it worked well - but if it was supposed to be an actual, magical thing I don't really like it. Because it was ambiguous, I think I liked this story more.
Well told, well paced with solid language. Nothing really to complain about here. Close to making the top 10.
And I definately thought it WAS horror: you don't need vampires and monsters and all that ephemera to make a horror story. Reality is often much more terrifying. These sort of horror stories surpass all others, frequently, because they are based upon actual things. I'm disappointed to see a lot of people raising the "this isn't horror" schtick here.
One thing I did not like was the title. It recalled All Quiet on the Western Front too much. It should have been called "The Rose" or "Sunlight" or something like that.
The only historical gripe I have with it is that when Bird mentioned Haight saying the Germans would break at Somme, it was because a secret weapon had been deployed against them that would ultimately win the war and pave the way for modern warfare: the Mark I tank. So Haight was not totally exaggerating. Given the timeline (the Royal Tank Corps. had been established by the time this took place) I am surprised the Mark I was not mentioned. Only a few months later (November) a few hundred tanks were deployed against the Germans in the first major armored victory in history.