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... that this is sterile?
I think what is sticking out is styles.
Thanks. I'll try to check if it is sterile, but I'm not sure how obvious mint seed is. I can't say I've noticed it on other plants.
I dissected some ex-flowers a few weeks later and they didn't have any developing seeds.
Lat/Lng: 53.2378, -4.1922
OS grid ref: SH537734