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RE: Creeping thistle / Acker-Kratzdistel / Cirsium arvense (Free Cultural Works by @schamangerbert)

If the aphids taking control you just use some black tea to kill them without hurting the plant, but on the other side the ants need them too. So it is to find a balance with them. In my garden there are only 3 of this plant, I think that is needed for the butterflies.