[h.h.]

Little ones, won't bite you. Even big wasps, hornets, yellow jackets won't bite if given space. Most anyway aren't aggressive, unless defending their nest. They might buzz you, but they're just curious and letting you know your limits. They add beauty and interest to the garden.
This is about the little ones anyway.
You can buy them. A little expensive. The best way is to attract them. Plant flowers, small flowers. Flowering herbs work well.
They're small insects, maybe a half inch tops. Even if you buy them, flowers keep them around.
Plant on both sides of your garden, or in pots that can be moved around.
Don't tell the wife you're trying to attract wasps, tell her the flowers and herbs are for her.

https://ag.udel.edu/extension/horticu...df/bi/bi-4.pdf
https://www.dianeseeds.com/flowers/be...l-insects.html
Synacra pauperi
https://www.negreenhouseupdate.info/i...ynacra-pauperi
https://www.cleanairgardening.com/insects.html

[mad librettist]

I wonder if the would stick around a veg area with a flowering living mulch?

[h.h.]

https://www.gardenwiseonline.ca/gw/ho...arasitic-wasps

[Microbeman]

I usually get along with yellow jackets but one summer they were so bad that they would attack our food even as it was going into our mouths. I've munched down on a few; never got stung in the mouth but a few friends did. They would pour into an open beer in a matter of less than a minute, making it undrinkable...they love beer.

[h.h.]

Give them a place to eat with your scrapes and a couple of empties laid sideways, where they don't have to contend with somebody shooing them off and they'll drift over from your protected plate. They want food, not confrontation. Most anyway

[floral]

I just read recently that comfrey and yarrow attract parasitic wasps. Glad to see that, as I already grow both for making extracts.

Ordered some trichogramma cards earlier this year. Haven't seen any caterpillars around but it's too early to tell if they made a difference. I did notice some yellowjackets and other bees, and in one case ants, on the cards. Hope they didn't just provide expensive food for other bugs in the garden.

[FatherEarth]

Outside of the trichogramma, you are saying yellow jackets and other wasps are beneficial as well?

Those horned worms are some real bastards when they get going...

[Granger2]

First, as a former Beekeeper, I will repeat what I have said many times. They don't bite, they sting. Wasps are beneficial, many going after caterpillars. They seldom sting unless their nest is threatened [in their perception].

A few years ago, I had a rapidly multiplying White Fly outbreak indoors. Released Green Lacewing larvae and hung Trichoderma wasp egg cards. Totally wiped them out with no other measures taken apart from Yellow Sticky Traps. I took the traps down after a week for fear they would attract the wasps. Good luck. -granger

[Microbeman]

Yes, they bite peanut butter sandwiches and other food but sting people.

[Granger2]

And caterpillars...sting first, then bite.