I have a Grand Fir (Abies grandis) and a Nobel Fir (Abies procera) in my yard. Their new growth tastes really good! A nice citrus and resin combination. I have to be careful to not eat too much of my Grand Fir, especially. It's so good! I haven't tried the White Fir. I'm interested to know how your trees taste! I have a post on how I harvest the new growth of Spruce Trees that would apply for the Firs as well. :D