Answer:
Not sure how many punds that is but you might need to check with your venue first. Real flowers stain floors and table linens and they get really mad when that happens. Although, all of our wedding flowers were real we used silk flowers for the flowers in the aisle.
For your tables if you end up using fresh flowers you may only need like 2-3 stems per table (you wouldn't believe how many petals are tucked away in one rose bloom).
If you go silk e-bay has vendors that sell them in packs of 100 or more for like $3/bag.
