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....
