What are these Yellow Flower Thingys?

First on looks like yellow loosestrife. Second one yellow yarrow.

BTW, both very pretty. :-)

-- 'To plant a Garden is to believe in Tomorrow'

... and the yarrow is a prolific self seeder … looks pretty with its lacey foliage, but quite agressive.

-- jroot

Thanks!
I wouldn’t even have known where to look to figure out what they are.
According to the pictures in Dave’s Garden, it is yellow Loosetrife.

I’ve been watching the Yarrow where I work, and it hasn’t spread much. She only had 2 clumps of it. I took a piece of each one.

-- ~ Michigan, zone=Cold! aka: DHG's Wife

You’ll have lots more in a few years. :) – particularly if you let it go to seed.

-- jroot

What you can try is cutting it frequently as it flowers. Achillea (the yellow yarrow) is a good cut flower.

-- Zone 4a or 4b... depending on where you are standing!