Young Magnolia Stellata leaves turning black..,

robbie2red

Hi all,

I have a problem! I’m not sure why but my magnolia Stellata’s that I have in pots aren’t looking great.

The leaves are turning black. The black seems to be creeping along the mid-rib of the leaves then spreading.

I’m new to gardening, and learning, do you experienced guys have any idea what this could be please?? Am I over watering? Or is it a disease? Help?!!! 

Thank you in advance everyone!

Rob

:-)

robbie2red

Here maybe a better picture for you to see????

robbie2red

Can anyone help with this please???

Dovefromabove

Not a plant I grow but hopefully someone here will have some suggestions ... can you tell us a bit more about them?  How old are they? What are they growing in? What’s the feeding/watering regime? 
That sort of thing ...