Originally Posted by Rhiannon Macfie Miller

ukdiver wrote:

Now I have a problem (else I would probably not be here ). We have a
10yo Bay tree in a pot. The bush is about 2 feet tall, the pot about 18"
diameter and height. The pot is in sunlight until mid-afternoon. The bay
was repotted this spring.

The problem is large numbers of yellow leaves, not just spots, the
whole leaf. This as all over the bush. They eventually fall off. This
has happened for the past couple of years, but seems to be worse this
year. The plant is well watered, but I don't think over watered. So I
am stumped for a cause. I have thought about mineral deficiencies, but
can find no help on the interweb. So I am turning to you for further
suggestions.

This happened to my bay-in-a-pot (about the size of yours) a while back.
I thought it might be magnesium deficiency. I took it out of its pot,
removed about half the compost and trimmed the roots somewhat, and
repotted it with fresh compost mixed with Epsom salts. This caused the
plant to rally for a while, and then it started to deteriorate again.
So I reckoned it was probably getting too big for its pot. It got
planted out in the garden, and it began to recover.

I don't know what happened next, because I moved house. Now we have
bought a new bay-in-a-pot, about ten inches tall, and this will probably
get planted straight out.

So try Epsom salts and see where it gets you.

Rhiannon