I need advice on reviving cammelia without moving them. I moved into a house with a set of four Camellia Winter's Star (best I can tell - oleifera?). They are planted in poor soil, solid clay, but certainly specimens worth trying to save. They are to large to move at 10'. The leaves are yellowing and browning, but considering they were just dropped in the straight ground and forgotten, over grown with weeds & vines, they are basically healthy. Is there a way to amend the soil without hurting the plants? I read in Don Hastings book to make small holes & fill with cottonseed meal but these books are a bit dated now.
I'd love to save these plants, any advice is appreciated.