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I only ever see them on this plant.

What are they called when they are at home?

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I guess that would be Terellia tussilaginis of the Tephritidae. John Smit or someone else will correct me when I am wrong.

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Hi.

Just mentioning that T. tussilaginis breeds in the flowerheads of Arctium and overwinter in the flowerheads as fully grown larvae or puparia. They are very easy to rear: just collect some of the flowerheads in mid-winter and put them in a large plastic bag in room temperature. In a few weeks you'll see the first wave of parasite wasps emerging. Several other waves of parasites will follow and finally, a few months later, the flies will hatch. No special care is needed, just open the bags every now and let some fresh air in. Breeding insects doesn't get much easier than that

Kahis

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Thanks!
Although I am not immediately sure what to do with these flies!

But interesting to hear about the parasites' parasites!

Does anyone know if these babes have a dutch name?
Grote klisboorvlieg springs to mind?

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Forget about the 'parasite parasites'. That was just my brainfart, I wasn't talking about hyperparasites.

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It's absolutely a couple of Terellia tussilaginis.

Best wishes,

John