All my Red Cauli are flopping, either short or tall stems. When there is lot of direct sun they just drop almost down and their leaves also flop, seems they are affected by the heat more than let's say Spectabile which so far I have not seen flop from a lot direct sun.
As soon as they get watered they look fine, still bent but not with flopping leaves and almost to the ground.
So now if I water them they get tall fast, if I move them out of the light then they also grow tall fast ( see those in a lot of light are much shorter and leaves more compacted), it all seems like a vicious circle with the Red Cauli.
I suspect the granular fertilizer that is around the roots is not helping either, like more leaves are generated at the top, the stem elongates and thus becomes even more top heavy to flop easier.
But it is clear that I cannot keep them dry, I have to water them when in full sun.
Maybe I could use some sticks to keep the stems up, as I was saying even if they get watered they are still arched pretty good.
Or maybe these need to planted slightly deeper than let's say Spectabile, to get more ground support?

How long have they been planted? It really does seem to be a problem with fertilizer.

I recently bought them, 1 month ago.
Seem like there was only 1 stalk cut down the ground level, so they are probably 1 year old, they have 4 new stems per root.

I find the tall sedum do so much better with no fertilizer. They grow nice and compact. I never have the get to tall and flop over.
In my area they also needs lots of sunshine.
Are you growing yours outdoors? In the ground or in pots?

They are outdoors in pots, as I was saying when sun hits them for like 2 hours they flop hard, then if I add water they get back to their normal flopping, just that this has made them grow tall way too fast and I assume the water engages the granular fertilizer and support them getting tall even faster.
I will simply have to remove the granules which I know they were added by the seller, not a fan of that type of fertilizing, seems like no way back so to speak, and probably is some high levels.

It might be that their roots are getting to hot in the pots. Two hours of sun isn't very much sun for sedum.
At some point the fertilizer should wear out.

Yes probably their roots get heated up, unfortunately as I was saying, they are flopped even if there is no sun on them at all, just that the sun just puts them down, they get around 6 hours of sun.
Just to show their shaded "constant flop".

They are looking healthy. That slight flopping might be normal for 'Red Cauli'.