A great part about weeds is all the lambs quarter!  I don't know how it gets there, but I love it! It is lovely steamed lightly or in any recipe in place of spinach.  It is also a lovely addition raw to a lettuce salad.  Such a nice free vegetable!  Here's a picture of one (sorry it's a little blurry–I'm still learning).  If you have some in your yard that is chemical free, pick it young and tender–Yum!  My mother-in-love makes a fabulous Lamb's quarter quiche.  The recipe follows. 

Ooh, speaking of Lamb's Quarter Quiche, I made one last year and took a picture of it. 

Here's the recipe:

1-9 inch crust
4 C lamb's quarter (a common yard weed here in Missouri)
1/4 C chopped onions
2 T butter
1 T flour
1/2 t salt
3 eggs
1 3/4 C milk
2 C Swiss Cheese (I made mine with just 1 C cheddar and added a little chopped turkey bacon. I also just used Pam instead of butter for sauteing.  These changes saved about 500 calories in the whole pie.)

Saute Lamb's quarter and onion in butter.  Stir in flour and salt.  Add eggs and milk, mix together.  Sprinkle cheese in crust.  Add Lamb's quarter mixture on top.  Bake at 325 for 40-50 minutes or until eggs are set.  Mine took over an hour, but my oven is not quite right.