I always keep a basil plant on the kitchen windowsill - lasts for ages & is in regular use.
I've just picked some leaves, but stopped when I realised they were sticky. On a closer look, some of the leaves had what looked like minute grains of sand on them.
DH thought that the leaves were exuding moisture, then crystallized into the brown bits.
I've thrown away the plant to be on the safe side.
Any idea what it could have been? And would it have been safe to eat ?