On saturday I noticed that some of my raspberry canes were showing signs
of Magnesium deficiency. On Sunday evening I gave them a foliar feed of
Epsom salts.

I was amazed to see the leaves greening up by yesterday morning -
probably not even 12 hours after I applied the feed. Do foliar feeds
always work this quickly? If so, what should I apply to my magnolias
which are looking a little chlorotic? Would nettle manure be suitable as
a foliar feed?

Many thanks

Neil