This is, to our very great delight, the first year where something attractive to insects has been in flower at all times - no gaps at all! There were times in the previous years where there was not much going on, flower-wise, so we tried to close that gap. Successfully.
Some of the plants are wild, some are cultured, but all of them are pretty robust, because my gardening style can best be described as "demented squirrel" - plant or sow the seeds, and then completely forget about it. If things go well, I'm then pleasantly surprised about the thing coming up (and usually remember that yes, there was something...) and if things don't go well, that plant obviously has no place in our garden.
Currently in the prime position of things doing their thing? Wild parsnip.
The Most Patient Husband of Them All and I both agree that these are, well, not the prettiest of plants. Actually, I find them relatively ugly... which normally would mean that I pull most of them out, and free some space for other things to take over.
But. Oh, there's a big but: The flowers, and the developing seed stands, are teeming with insect life. TEEMING. As in there is a cloud of flying critters around them all day long.
These plants are the preferred meeting-and-mating spot for minstrel bugs. Plus there's a huge range of different flies, mostly hover flies, hanging out there. One or two hornets are commonly seen around as well, on the hunt for some juicy prey (though I've not seen a successful attack yet).
Which means... we are in total agreement that these ugly green-yellow guys are welcome to stay, and grow, and do their thing. After all, there's space enough for other things as well, and every flower that helps insect life in our day and time is more than welcome, and oh so necessary.