Hi there, first ever question on the forum. I have 3 youngish feijoa / pineapple guavas, one Triumph, one Mammouth and one unnamed variety, all planted in new borders with fresh compost, i’ve noticed on 2 of them the leaves are surprisingly ‘off colour’ with a yellowish tinge to the green , but not ‘yellow’ or dropping like citrus with chlorosis. They look healthy otherwise, any suggestions? Anything to worry about ? I didnt think these suffered from iron deficiency or is it normal winter variation?