Cutting back euphorbias?

[Rojak]

I have a cluster of euphorbias in my garden - the ones which flower in spring and produce lovely yellow-green flowers.

They're looking a bit tired now and I'm wondering if I can cut them back and how far I should be cutting these back.

Would appreciate any advice. Thanks!

Don't know about cutting back - mine just used to die down (and have died totally now!) - but don't forget to wear gloves when you do it as the sap can irritate your skin.

Mine don't seem to die - the flowers just go a bit brown and dry - but the leaves still look very green and seem to do so all winter until they flower again next Spring.

However, I want to cut them back as I have some gladioli growing behind them this year and I can't see them! And I don't want to cut the euphorbias back, only for them not to come back next year. (I'm a bit of a novice to this gardening malarkey!)