I have been advised to give my bay trees a fortnightly liquid feed after repotting them, to help them grow. They have never been fed, and look very tired. Could anyone tell me what sort of liquid feed I should use please? Thank you very much for your help.
As far as feeding is concerned, a small handful of long-lasting fertiliser such as blood, fish and bone once a month (April to September) will do just fine. Sprinkle it over the surface of the soil and gently work it in to stop it blowing away
From here
http://www.gardenfocused.co.uk/herbs/bay-tree.php
Or I'd think any of the normal liquid feeds will do.