Texas Gardening: new to gardening (in austin,tx), 1 by bphil00

bphil00 wrote:
Hi guys,
so this is basically my first time gardening (I've done some container gardening last year tho).
I have a few questions I was hoping ya'll could offer some advice on. I've attached some pics to reference.

I'm growing some sweet corn and they're looking really good, but are they too close together? They are about 7 in apart, should I thin them? If so, is it worth trying to relocate them?

I bought a bunch of Texas sweet onions (white). As you can see they are somewhat standing up, but they are very flimsy and some "stalks" are fallen over and the tips are dried and browned a bit on some. I planted them about a month/month and a half ago. Is this normal/healthy? do the tips need to be trimmed?

I've got a little planter that I started some cucumber seeds in, they are about an inch to an inch and a half tall. How long should I wait to put them in the ground?
The three on the left have very slightly turned yellowish, is that bad?

Thanks so much in advance, I'm very excited to have a garden this year!
Brian