Help with an Oakleaf Hydrangea, and what is that weed?

It is hot and humid out again today, so I watered the veggies and pots on the west side this morning, while they were still in shade.  Hopefully they'll be able to enjoy the drink before the sun bakes them again this afternoon.

This is a bed of iris and spiderwort that we kept trying to get rid of, but we've given up now.  The spiderwort is a spreading kind, rather than a clumping kind, and it has filled in nicely.  There are orange asian lilies in here too, that bloom later.

The poppy plant has bloomed:  two blooms this year.  It had one last year; maybe next year I'll get three?

I planted this spiderwort last year.  It has a very yellow-green leaf, with a deep blue/purple flower.

This is my last hybrid columbine bloom; the species are still full of blossoms, and the hummingbirds are visiting them pretty regularly.

Emma took this shot, of the daisy in her garden.

Dianthus

Finally, this is the plant that Sissy thought might be Star of Bethlehem.  The flowers look more dandelion-ish than lily-like.  The strange thing is that I've never seen this anywhere else on our property.

I'm also having a problem with the oakleaf hydrangea (below) I planted last year.  It did beautifully through the fall, but this spring was incredibly slow to bud and leaf out.  (Scilla came up around it, and is the yellowing leave in the bed).  Now it has tiny leaves, but it's like it's just stopped growing.  It's in a raised bed, so root rot shouldn't be a problem.  It's not showing any wilting, and I have fertilized it.  I don't know if it's going to make it, and I don't know if there is anything I should do for it.  Any suggestions would be much appreciated!