First one I'm guessing Amaranth too. Nice color!
The second is Pokeweed. I grow Pokeweed on purpose and don't mind volunteers. However, it is known to be invasive. It's also mildly toxic(People can eat the young leaves if they boil and dump twice like acorns. "Poke salad Annie" and all sort of thing). I think it's pretty and birds are nuts for it. I get more pretty birds from that plant than the bird bath and feeder!
The orange flowered is also another weed.Butterfly weed. Can be invasive as well. However, it is the larval food(white caterpillars with yellow and black stripes) of Monarch Butterflies. I was very dissappointed to find out what I thought was Butterfly weed in my garden wasn't! I envy you. PJ

I've wondered what that 5' tall plant was. Pokeweed you say?
It is a perennial, and so far I've only got one. Very exotic looking.

PJ I have a few butterfly weed seeds if you'd like some..

Now back to the plant 1 question. Is the fluff on the top where the seeds are if yes how and when do I colled them?
Thank you
Janet

Thanks Janet! I put down butterfly weed seed but it didn't take boo hoo.
I read that amaranth is a vigerously reseeding annual. I don't know when to collect tho. My guess is fall? PJ

Janet, wait for the amaranth to make seeds. You will know when they are ready. Same with butterfly weed. If you wait too long, it will pop and those seeds will go flying everywhere. That is what they were made for.

All these plants freely reseed.

You could visit the Seed Saving forum, lots of good info there.

Janie, who loves saving seeds

Here is a link that might be useful: Seed Saver forum