Climbing Hydrangea

[Alcea]

I bought 2 x climbing hydrangea in Lidl this morning for the side of my shed. I'm just wondering if I need to buy a trellis or will they climb without any help?

They are self-clinging, which means they stick themselves to a surface with aerial roots. However, you can tie them to any structure to start with, and I find it's best to fix the shoots to the surface for the first season so that they "stick", and then they will romp away

Thank you Trethew

Can I add that they're likely to do very little for a few years before they romp away!

agree with tdm1

mine have sat at the base of a wall for two years, getting no bigger on top. I just hope there's an enormous root system.

They take a few years to get going but they're worth the wait in a shady place ime. I'd put support up to stat them off and train them along horizontal wires first if you want them to do a cover up job.

I don't mind waiting, my garden is an ongoing project.
I googled the tags though and I'm not even sure that they are climbing hydrangea, although that's what the ad says. I'll post a link

www.lidl.ie/en/special-offers.htm?articleId=671

Nope. Shrubs not climbers.

Hydrangea petiolaris is what you'd need.

I can still plant them at the side of the shed but I'm disappointed they're not climbers. I'm a bit of a novice, but surely that's false advertisement