seeding for a medow

Hi,

I removed all thick lumps of grasses, dug out the extensive nettle root system, bramble roots & dandelions from my fifth acre plot.

I seeded my first patch 3x 5m last fall with seeds from "BOSTON Seeds" & all grew well.

Then seeded the second patch 3x6m with same seeds but this time hundreds of small nettles appeared everywhere amongst the wild flowers.

These nettles have their individual fine small roots. I puled out a lot where I could reach without standing on the other plants. 

Do I leave these to grow & take over the plot?

This particular patch is the area where no nettles ever grew in the past, perhaps because of the thick clamps of grass.

Have you experienced this too?

My daughter says that maybe the seeds include nettles which are good for wild life??!!.

Thank you       ......Nick