Posted: 03/08/2012 at 23:39
I can tell you that I have done this several ways, sowing in existing lawn and letting it all grow up and planting plugs in this existing area. Both worked to some degree but you definitely need to grow plugs for it to be really successful in my experience. If you have a small patch then this may be ok but is extremely labour intensive on a large patch.
After two seasons of 'ok' but not brilliant results I de-turfed & dug over the area sowing perennial and annual wild flowers. I have to say that this has proved so much more successful than trying to improve on what was already there for me.
I do however think that it depends on what is already in situ? Here the area that I have developed was previously a mowed lawn, by just letting the tough & vigorous Rye grass grow prevented many of the wild flowers that I wanted to grow compete with it! If you are trying to enhance an already wild country area with less aggressive grasses then you might just get away with sowing some seed into it??... If this isn't the case I would start from scratch myself...
My latest post on my blog (link below) does actually feature my new wild flower lawn so you can see my first year results from a complete de-turf for yourself?...