Posted: 02/10/2016 at 17:22
A couple of my magnolia in pots look similar and I think it's due to the pots getting a bit too dry earlier in the year. The same varieties I have planted in the ground look fine. If you need to keep them in pots, I would put them into larger ones and use a John Innes #3 mixed with about 20% of ericaceous compost (and leaf mould if you are lucky enough to have any) as this seems to hold water well.
Last edited: 02 October 2016 17:25:17