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What is the name of this plant?

Can anyone tell me what this plant is?

One of the gardens I look after has a few of these, some about half a metre tall, some more than a metre. 

They look like they are going to flower soon. Previously they have been cut back and have regrown - the old stems are still visible. They have a rhizome type root.

I don't know how to take care of them, if and when to cut them back, anyone help me out?

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  • Euphorbia

  • Euphorbia. You must wear gloves when dealing with these plants as the stems bleeds a sticky milky white sap that can irritate your skin. Cut back the old stems to the base and clean your seceteurs afterwards as they will be sticky from the sap.
  • Euphorbia. Looks like Euphorbia characias subsp. wulfenii.

    Cut back the flowered shoots in late summer but beware the sap. Always wear gloves when handling as the milky-white latex sap is highly irritating to skin.
  • Euphorbia 'Wulfenii'.  Beautiful plant, great for structure and sets off other plants nicely.

    As others have said, wear gloves to avoid contact with the irritant sap.

    Cut back stems that have flowered to the ground (late summer?) to regenerate from the base. Stems that have not flowered still have value for their foliage. Might take a 2-3 seasons to renovate to a smaller size.  That's what I'd plan to do, not sure how it would respond if you took the whole lot down to ground level in one go.

    If selecting stems to take out, take care not to damage the ones left behind as they could snap easily and foliage messed up a bit.

  • Thanks for all the help. Good job I asked, don't want skin rashes.

    It has been cut back before, I have been removing the dead stems, looks much better for it.

    Melissa, see what you mean about damaging the growing stems, a bit of a nudge and they crack and over go the longer ones. Thanks for the tip.

    • PRO

      Scott, even when wearing gloves, I had that sap get into my eyes and it was excruciating. I had to have eyes washed out and was uncomfortably for the next 24hrs.

      It was hot while cutting them back, sweating on the brow and was continually wiping my brow with the back of the gloves. I guess some sap got transferred back on my brow and with the sweat, it moved into my eyes. Ouch.

    • Good Scott. Glad you found the tip helpful.
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