It’s probably sedum. There are many kinds of sedum and they all work well in rock gardens. Here’s one of the yellow ones. http://en.wikipedia.org/wiki/Sedum
without a photo it is hard to tell you for sure what the yellow flower is. some sedums bloom yellow such as Blue spruce sedum which is blooming in the mid west right now.
It’s probably sedum. There are many kinds of sedum and they all work well in rock gardens. Here’s one of the yellow ones.
http://en.wikipedia.org/wiki/Sedum
without a photo it is hard to tell you for sure what the yellow flower is. some sedums bloom yellow such as Blue spruce sedum which is blooming in the mid west right now.
Post a picture. There are Lots of “pretty yellow flowers”.
?? poppy ?? http://www.daytonnursery.com/Encyclopedia/Images/WaltersGardens-LO8368-Papaver-Summer-Breeze-Series-Yellow.jpg
?? cosmos ?? http://stuweb.whes.tpc.edu.tw/~970221/images/yellow_cosmos_1.jpg
?? coreopsis ?? http://www.flickr.com/photos/sneezypb/699089083/