Answer: The most common reasons for lilac not to bloom are too little sun (they like full direct sun all day or at least half a day incl uding at noon time) and pruning at the wrong time. They bloom on old wood that grew the previous year, so the only time to prune is in late spring right after they bloom. Pruning at other times will remove the flowering wood. Another possibility is overfertilizing. When overfertilized they tend to grow foliage at the expense of blooms.
Sedum or stonecrop can flop over for several reasons. If they have not been divided and renewed for several years they lose vigor. If they are in too much shade they will be weak. If they are overfertilized they will flop. If none of these seem to apply, you can try cutting it back in late spring when it is about six to eight inches tall and see if that helps them regrow shorter and stockier. The timing does not need to be too precise but do not wait too long into summer to do it. Remove the tip growth leaving a bit of foliage behind.
I hope this helps!
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