Webs on plants are usually a sign of spider mites.* They come in different colors and are very difficult to see.* You can put a piece of white paper under the area you see the webs and tap the plants.* You should see small dots on the paper that move.
The brown tips could be from the flouride in your water.
Most folks that answer questions on forums answer them on the forum and don't respond directly to a personal e-mail address.* If you have your settings to receive a notice of a response to your post or to a private message, I would suggest you edit your post and remove your e-mail address from public view as that can lead to spam.* If you find you can't edit your post to remove your e-mail addy from public view, lmk and I'll do it for you.
If you reduce the size of your pics you can post them here.* If not, you can post them on a free photo site such as photobucket.com and post a link to the pics here.
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.