Should I deadhead Cirsium rivulare 'Atropurpureum'. Does it grow more flowers like dhalias?

Bluebelltime

Should I deadhead Cirsium rivulare 'Atropurpureum'. Does it grow more flowers like dhalias? Or does it flower just the once ?

Bluebelltime

Fairygirl

If you don't deadhead, it'll seed everywhere. 
They just flower once really, but have multiple flowering stems.

Bluebelltime

Thanks 

Lyn

Was talking to someone on another site, he posted a link saying it was sterile and his had never self seeded, someone else then said the same.
He’s going to send me a head later to try so we’ll see.  

Fairygirl

I took them out in a previous garden  because they became a real nuisance 

Lyn

https://www.plinthetal.com/blog-1/2014/07/19/plantsmans-corner-cirsium-rivulare-atropurpureum

Let’s  hope they’ll grow for me,  funny how the internet differs so much.

Fairygirl

I only bought one plant. It became a huge nuisance!

JennyJ

They never self-seeded here and don't really do very well. The clue's in the name - rivulare - they like it damp, like it is in Fairygirl-land  :. Too dry for them here.

Wilderbeast

I wanted to get more of these and have failed miserably, all info I found was they are sterile. Spoke to a nurseryman who grows all there's from root cuttings, that is this winters project. Ours have bulked up into really big plants and look great, I deadhead once the 1st flush of flowers have gone right over (I cut the stem down as low as possible) I usually get a 2nd much slower flush of flowers. 

Janie B

Mine are doing well in the border, have bulked up nicely over the last few years, but have never self-seeded.