I have a Cornus Alba Elegantissima in a north-facing, mostly shaded garden. It gets a little less rain than the rest of the garden due to its proximity to the porch/roof overhand, but overall it seems to grow well (lots of shoots, large leaves, really bushy growth). Last year, I noticed some of it's branches had pure cream leaves (no green at all). This year, there seems to be many more of the cream leaves, with just a few of the new leaves having green on them. Does anyone know what this indicates? Too little light? Too little water? Nutrient deficiency? I'd love the plant to revert back to its lovely variegated colour. Any ideas? Thanks.