I planted 9 small cuttings two years ago and now this plant is taking over the garden, even though I put down a 6 inch root barrier. I was told this was enough, as the roots are very shallow with spurge. Guess my source was wrong.
Does anyone know how deep a root barrier you need for spurge?
Finally, I thought spurge only spread by rhizomes but have just learned they also self-sow. Will cut the flowers before they set seed this year...but meanwhile I want a better root barrier.
Thanks in advance,
DR
how can I stop euphorbia / cushion spurge
If you've been letting them go to seed, are you sure the ones that have "escaped" the root barrier weren't ones that came from seed? I honestly don't know how deep of a barrier you need with these, just wanting to make sure you actually need to go to all the trouble of putting in a new barrier, maybe all the escapees were seedlings.
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