How can I make DIY weed killer?

ROSE CLARK
by ROSE CLARK

I HAVE 100'S OF 5' TALL GARDEN PHLOX. THEY HAVE TAKEN OVER MY FLOWER BEDS. THEY ARE BEAUTIFUL WHEN IN BLOOM, BUT THEIR SEED HEADS CONTAIN MANY SEEDS. I BREAK THEM OFF, BUT GET NO WHERE. I'VE TRIED DIGGING, NEVER GET THEM ALL.

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