Help with Flowers.

I have recently (approx 6 weeks ago) built a rockery and have about 15 flowers in it. They were purchased ready grown (not too large) and most are growing fine bar 2 of them.

The first is the pulsatilla vulgaris.
It flowered about 4 weeks ago and had a small flower similar to this:
http://www.laden.dk/Billeder/p/pulsatilla%20vulgaris%20P10.jpg
Now, it looks more like this:
http://www.aphotoflora.com/Pulsatilla%20vulgaris-seed-02-06-05.jpg

The plant looks pretty healthy but i'm suprised the flower died so quickly. The stem still looks healthy! Any advice?

Secondly is the Primula denticulata which did look like this:
http://pharm1.pharmazie.uni-greifswald.de/systematik/7_bilder/c920/C92-1071.jpg
(however it was white). Now the the flower is dead and so is the whole stem and it is now a dead yellowy shade of brown. I cut the stem diagnally (it really looks comletely dead - i could have snapped it), was this the right thing to do?
Any advice?

Both plants, as i've already said are on a rockery seen here:
http://i77.photobucket.com/albums/j47/mbwest165/garden7.jpg
and if you look right at the back you can see quite a large round white flower, thats the denticulata Wink

.
There are also quite a few weeds on it now but I have pulled out any big ones and all the ones close to the flowers any advice would be great.
It's taken me ages to get the garden where it is, doing it mainly for my great aunt and i'm trying to get it to a stage where it wont need much work.

Finally with the rockery instructions i was given i was told to lay turf upside down in the rockery, which I did, and now it is growing through and some of it through the middle of plants. It actually looks quite good but could this 'steal' the nutrients and kill the other flowers?

Thanks in advance guys and girls Wink

MB!

I looked it up and found this site

http://www.mobot.org/gardeninghelp/plantfinder/Plant.asp?code=B350

In there it states the following

Noteworthy Characteristics:

Pasque flower is a low-growing, clump-forming, early spring-flowering perennial which grows 9-12" high and as wide. 5-sepaled, anemone-like, goblet-shaped, solitary flowers (2-4" across) appear atop thick stems in April before the foliage develops. Flowers vary in color from blue to reddish purple with a bushy center clump of golden yellow stamens. Foliage begins to develop as the flowers fade and features fern-like, deeply cut, basal, grayish-green leaves (3-6" long) and smaller stem leaves. Buds, stems and leaves are conspicuously silky. Flowers give way to feathery seed heads which are quite showy. Formerly known as Anemone pulsatilla.

if you click on the link and scroll all the way down, theres pics there of your seed heads.

_________________
I do not have a green thumb
My plants just have the will to live.