Sorry I wasn't able to answer you before now but I was away for a few days.* Here's several links you should find helpful and interesting.
Click on 'Butterfly Gardening', 'Butterfly FAQ', 'USA Butterfly Gardens' and more on the left.* There's even a link for free milkweed seeds for the Monarchs.
Speaking of the Monarch, here's some fun sites.
This is a map of Louisiana and you can click on each Parrish or look at all the photos.* Some list the larval and adult foods.
You might also find this Louisiana site informative and helpful.
This site is out of Michigan, but has some useful plant lists, including common weeds that feed butterflies and moths.
Now to the hummers.* :D* I use this first site to know when they are near in the spring. Loads of info at the second site, but you can click on 'Maps' for hummers, butterflies and bird migrations.* The third site is my favorite feeder.* It's the easiest to clean and fill.* I make larger batches of food and freeze it in small baggies.* I have 2 of the mini ones.
Now don't stay up all night reading!* :shock:
When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant.