Because all I can find are sketchy websites for insect identification, I am putting it to you

[Guest]

These little beetles can fly, are all over some weeds outside my greenhouse and they are little...approximately 1/4 inch long.

[Heidi]

Plants susceptible to flea beetles can be mulched with Catmint at the time of sowing. Works great as a preventative.

[Brandon]

flea beetle

[Bobbye]

Try the free app called INaturalist. You take a picture of whatever and post in app. Community will help identify it.

[May]

Try garlic with water and sprinkle it on the plants.
It makes big difference and it’s natural.

[Linda]

They like it hot, so anything that you can do to cool it down helps reduce them, like a sprinkle in the heat of the day.