In which questions are asked regarding the specific nature of plants

People plant the dangedest things in their yards and gardens here in the Swamplands.

I once had a neighbor who deliberately -- deliberately! -- planted bindweed, because she wanted morning glory flowers and didn't want to have to take care of them. Here's a clue: bindweed loves to grow amongst blackberries...and I think my views about blackberry vines are pretty well-known.

Then there's Haiku Farm. I don't know that the former owners planted Scotch Broom next to their blueberries and grapevines, but I do know that the plants I found had to be cut down with (I'm not exaggerating) the chainsaw. Fortunately, they don't appear to have spread to the pasture.

Now that Spring has sent a few postcards indicating imminent arrival, stuff is starting to grow in the front yard, and I'm not sure what a lot of it will be when it grows up. I'm asking for input from the Master Gardeners and other smart folks: what is this stuff?

I know that various organizations have their classifications for plants, but here is MY criteria:

: Class A Plant : produces fruit or flower that is beautiful, fragrant, edible and nutritious for humans, horses and chickens. Rabbits and deer won't touch it. Hardy perennial, starts actively sought by friends and neighbors.

:Class L Plant: lovely landscape item; drought-resistant, needs no pruning or shaping. Attractive to songbirds. Inexpensive and readily available at garden centers and grocery stores.

:Class K Plant: shrub or tree that even blatent neglect and abuse (like running it over with the lawnmower, repeatedly) will not kill. Is mostly not ugly.

:Class O Weed: sprouts and grows to maturity overnight, producing prickly and persistant seeds within 24 hours of being visible in the garden. Rapid spread. Satisfying to chop into small pieces until the vines shrivel and smoke.

:Class S Weed: Self-seeds freely in vegetable gardens and other cultivated spaces; strong unpleasant scent, which clings to skin and hair if touched. Dogs love to roll in it.

:Class X Weed: Noxious weed, crowds out native plants, gums up the lawnmower, smells bad and attracts rats.

So, here are the plants in my yard. Please tell me if I should be encouraging them...or instead be racing to use the Implements of Destruction on them!

1.

Is this some kind of iris? I can't tell yet. Hosta in the background, though, right?

2.

this looks like lavender, but it isn't--the smell is wrong.

3.

not sure about this--the blue flowers are pretty, but it's all over...sure sign of a weed?

4.
this thing looks like cattail to me, but the seed pods are weird. Also, it's growing in a spot near a fake pond (I will be taking that out--who needs more mosquito condos?) but the ground isn't wet.

5.

no clue about this. It looks so healthy, I suspect it's a weed.

6.

??? what is this??

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Any red flags, O Gardeners of the World? Any "Class A" plants?