Hello, could you please suggest what I can do to assist two bay trees (growing in LARGE planters, outdoors) which don't seem to be doing very well ? Leaves are a greyish green, instead of their former dark green colour and the fol iage is nowhere near as luxuriant as it usedto be. Some of the leaves have turned brown but the trees are watered regularly. The leaves also seem to have lost their "waxiness". I have tried feeding them with blood, bone etc. but this has not helped. Any advice would be welcome. Thanks.