Instead of "watering", I suggest you put the hose on it with a fast drip and leave it until the area around the tree is saturated. This will use less water and do much more good for the tree. I agree about putting any tree out at this time of year is stressful for the tree, but a willow................even more so.

Can also drown just about any tree with too much water, especially in the clay soils common around DFW.... "watering everyday AND drip bags" sounds like it could be too much. Dig down and check or use a moisture meter you trust to see how wet the soil is staying. May not be the problem, but fairly easy to check with a few inspections.

Roots need Oxygen and will struggle or die if water can't drain from the
planting hole quickly enough or it is kept saturated by over watering. A long slow soaking every 2 or 3 days should usually be enough even at these temps as long as the water is allowed to drip long enough to reach the bottom of the root ball.

Thank you, I appreciate it. The trees were on sale for 75% off. If I can keep them alive it'll be a great deal!!

Do any of you have opinions on SuperThrive?

I will buy tree at this time but then I keep them in the shade in their pot till the weather and ground cools off before I plant them.

I wouldn't use superthrive right now until it overcomes the transplant shock. It's great stuff in tiny amounts, but newly planted trees are trying to grow roots to take up the superthrive and water. Once you see new growth, you can start with fertilization and treatments.

Oops...I used it today. I planted all 4 of these (30-gallon) all by myself. Blood, sweat, tears, and a lot of cuss words along the way to get these in the ground. I MUST NOT kill these things. I will just crumble!!! Seeing yellow leaves fall to the ground is killing me

Those are going to look nice when they mature! I have a 12 yr old Globe Willow, and it's showing heat stress ... yellowing leaves, and some leaf drop. Totally normal. Good advice here--no more fertilizer, lots of water, make sure of good drainage. Don't panic, it's a tough time of year for them, but they should be fine.

They will look nice and create quite a canopy. I put them behind my garage and barn for shade from the west sun, and they have done their job. They are short lived trees, but I still have two of them.
Wishing the best for you.

I planted all 4 of these (30-gallon) all by myself.

Wow - digging 4 holes for 30 gal pots in our near triple digit heat? I mowed the lawn, pulled/cut a 6 ft pile of overgrown or wilted foliage, moved several frying plants to shadier spots, and put in some new Russian sage and blue grama grass.... yet somehow now feel wimpy :-)

The trees do look nice as you've spaced them; hope they do very well for you.

I planted over the weekend. Not all 4 in one day! LOL. I'm stubborn and want things done NOW!! Thanks, I'm hoping I can nurse these to health.