I have my lemon balm in a sunken trough same as the mints and it seems to stay put just fine. I sometimes have to clip the mint when it tries to make a run for it but never had a problem with the lemon balm.
Burnet on the other hand! That seeds everywhere as does the sweet cicely but, you're right @B3, weeding the herb garden is a delight for the nose.
"The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it." Sir Terry Pratchett
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Burnet on the other hand! That seeds everywhere as does the sweet cicely but, you're right @B3, weeding the herb garden is a delight for the nose.