If you don't get a definite answer here, you might ask in the Fruit & Orchards forum. Can you take a larger, clearer picture of the pit? They can also advise about pruning off the dead branches and evaluating what's left of the tree. http://forums2.gardenweb.com/forums/fruit/ Was the fruit soft when you tasted it? If not, it probably wasn't ripe yet. There are some plums which are green when ripe, but it's not a common color for ripe fruit.

P.S. There is a mistake in the post I just gave you a link to. The Gardenweb Garden Galleries are actually at http://photos.gardenweb.com/garden/galleries/ , not the web address I put in the post. Sorry for the confusion. Also, there are many galleries associated with different forums. The Cacti Gallery is an example. It can be found at http://forums.gardenweb.com/forums/cactigal/ . Lastly, there is a way you can change the size of pics you post. To do this, use the following string [img src="your link here" height="200px"] but replace the [ and ] with and make sure the " and " are included in the command. If you want people to be able to click on the smaller pic and get the bigger pic, you can use [a href="your link here"][img src="your link here" height="200px"][/a] but replace the [ and ] with and make sure the " and " are included in the command.

I went and looked up pictures of the mallow. It's also called French Hollyhock (which sounds better) I'm pretty sure that's what it is now. I guess it's biennial which is why this huge crop didn't happen till now. The kind I planted is Zebrina. I had no idea it went so nuts! I have tons of them and I already pulled a ton out! I guess I'll just wait and see if it blooms...I have them sprouting up in sidewalk cracks and in between rocks and everywhere. p.s. I also have this, I think, creeping buttercup, that I planted and it IS a weed. I planted it in my rock garden 3 years ago and it has completely taken over. It's covering the whole garden (about 12x8ft) So, if anyone wants to cover a big area fast plant that. It has cute yellow buttercups all over it that are bloooming now. But I think I'm going to have to start my rock garden over.

Regarding plant #1, did you ever have Love-in-a-Mist (aka nigella) planted in the area? It self-seeds like crazy and the seedlings look very similar to that. Once it crosses for several generations though the colors get too "muddy" and it isn't pretty any more.