David Trudgett writes:
I've been soak watering once a week as per the suggestion on the tag
that came with it. It has also received cow manure fertiliser and even
some liquid fertiliser.

Scratch down into the soil out from the trunk to see whether the soil
is too wet or too dry. Citrus like soil that drains well, but the flip
side of this is that it means they also need regular watering.
--
John Savage (my news address is not valid for email)