Since last year I've been trying to cover a large area with sedum. I have all sorts of sedum going, but the john creech sedum is growing the fastest. It was spreading quite fast until about 2 weeks ago. Some patches are turning yellow. It's mid June and the weather has been sunny and fairly hot. I have a sprinkler system watering twice a week. I'm in zone 6a (new york state) and they get sun all day. I can't figure out if they're overwatered or underwatered. Do sedums stop spreading in the summer? some patches won't fill in no matter how many times I add transplants....

It's interesting because I saw some native sedums grow on random roofs with barely anything more than dust, the seeds end up there due to wind as these are mostly abandon places that I have seen.
They seem to be doing fine with lots of ton of sun barely anything else but dust and concrete.
For example there is a bridge where some sedum ssp. simply colonized the entire sides of the bridge, barely anything more than dust and concrete sitting all day in the sun. Unfortunately the cleaning company considered this was a weed and cleaned them off the bridge, luckily some tiny places survived and less than a year 10% of the original spread is back just with some tiny places surviving this "cleaning" . But due to lack of actual substrate now as it was cleaned I am sure they will need a lot of years to get back and if they "clean" the sides of the bridge again, it's never going to get back.
But these are actually Sedums not Phedimus like in your picture, yours e can get pretty big with quite succulent leaves. I am not sure if Phedimus can take such harsh conditions like I was mentioning above.

Hi sj6x. Can you tell us what varieties you have growing?
The Phedimus types are good growers if the soil is right. Some, like Paleo mentioned, can grow just about anywhere.
A type of Sedum album has populated our cement bridge that crosses the creek in our back yard. A very tough plant.
Each type of sedum likes specific environments. The makinoi types do not like full sun.

valleylynn said:Hi sj6x. Can you tell us what varieties you have growing?
The Phedimus types are good growers if the soil is right. Some, like Paleo mentioned, can grow just about anywhere.
A type of Sedum album has populated our cement bridge that crosses the creek in our back yard. A very tough plant.
Each type of sedum likes specific environments. The makinoi types do not like full sun.

Not sure. I posted pictures. I thought it was called john creech. more than that I don't know... it seems to be growing a little better now that temperature has dropped a little

sj6x, I read your post again at the beginning of this thread. It looks like the 'John Creech' isn't getting enough water during your really hot days. The areas it is not growing in may be differences in the soil, and not enough water?
I bet that patch is really pretty when it blooms. You might have to amend the soil a bit.