Last year i planted out some tagetes filafolia -mexican mint-i had germinated from seed -and it grew along very well, got to 6 foot high but our climate is too bad for these to get to the flowering stage which is around october---maybe in a tunnel---now i thought that these are insect repellant species and that wasps are more of an insect eating species--yes they eat wood to make hives --but dead stuff is what i have observed. Then several of my well grown mexican mint plants started to loose their tops --almost overnight --chewn off . Then others started to lean over from the base , i blamed slugs ,then birds , then i found the culprits ---wasps were eating away at the living stems down to the pithy center, then move up a bit and carry on , a relay team of them seemed to be at work. Three out of twenty survived long enough to get a few small plastic tubs of leaves harvested , and only because i put out some jamjar beer traps around them placed in a car tire. wasp in the picture is in the middle--bit hard to spot.