First, determine the output of your water wand so you know how much you're applying. To 3' wide plants, I apply 2 gallons twice a week in summer, less than that in spring and fall. To new roses from 3-gallon pots, I might apply a bit less than a gallon every other day for a couple of months until the roots get out. If temperatures are in the 90s, you would need to water a bit more than this. Occasional wilting in the afternoon is OK if there has been a change in weather, a sunny day after a couple of cloudy ones.

Yellow stems are dying. If the yellowing leaves have green veins, that suggests overwatering.

I forgot to mention, waterlogging can cause wilting of soft growth and leaves. The soil needs to drain between waterings, and in clay soil drainage can take up to two days.

You can use a thin sharpened bamboo stake or pointed rod as a probe to determine the depth of water penetration. Saturated soil is easy to push through.

Thanks for the reply. It may be waterlogged, as you suggest. I'll use a stake to check it out.

Thanks, Jeanie