Hello. I'm on southern Vancouver Island and planted Portuguese Laurels 3 years ago. While they are doing okay, many of the trees have yellow leaves, and a few trees have a branch where every leaf is dark red (see photo attached). The copious amounts of rain we received last winter and spring didn't make a difference in the yellowing of the leaves, and the soil analysis shows shows "low" or "very low" amounts of NO3-N, pH, T.P., and K. I have a few questions... 1. Opinions on what's causing the dark red leaves on an entire branch? 2. Given the lab results, it looks like I need fertilizer but I've never used applied it. Any thoughts on which type to use, and whether I should apply it in the coming weeks as the rainy season begins, or wait until the spring? I've received conflicting advice on fall versus spring; and I've been suggested everything from bone meal and mulch, to 10-10-10 or 20-20-20, to a liquid "rootbooster" product. Thanks in advance for any input.