I'm growing leeks on my allotment and have been told to give them a heavy
top dressing of blood, fish and bone this month.



Someone else on the allotment has told me to use Sulphate of Ammonia
instead.



As I normally don't put any dressing on (I just mulch and/or draw the soil
up around the stems) is there anyone who has experience of growing leeks and
can advise me, please, which, if either, I should do?



Regards,



John