Cynthia ... I almost agree with you ...
There are a lot of right ways to grow roses and some times we need to tweak things depending on our climate, soil and the rose.
The main two things you need to provide a rose planting it this late in the season is water and temporary shade. How much water depends on how much rain you've been getting. If you're waterlogged, the rose can get too much water, but in our abnormally dry climate we'd need to water periodically. In principle, the more often you water the rose, the more it's inclined to develop shallow roots and NEED that frequent watering longterm.
Absolutely. Basically when you first plant a rose, you are growing roots. I helps the rose a lot, if you grow a healthy root mass. That means you want the deep anchor roots and you want to do what you can to help the rose grow the feeder roots that are closer to the surface spread out from the crown of the rose. The healthier the root mass, the healthier the rose. The roots are the foundation of the plant.
I water deeply once a week and then do what I call a "feeder root watering" in the middle of the week. This watering is not intended to go deep down to the anchor roots, but to keep the feeder roots moist in my soil.
The house pad for my garden was cut out of a slope which is an active part of the watershed for the Trinity River. The soil beneath the surface is filled with a lot of small streams that collect water and then is a part of the process of sending water to the river. This kind of "soil" does not hold moisture, it collects moisture and sends it down the mountain.
The feeder root watering is sufficient to make the soil particles swell up and hold moisture in the root zone long enough for the plant to get the moisture it needs to survive in my hot dry summers.
If you can water deeply and give it an interval between watering, it can toughen up the rose. When first planted, I might water every day or two, but after that the whole bed gets weekly water in dry periods and no more than twice weekly in bad spells. Once it starts putting out new leaves, over the ones it had when it arrived, you can treat it more or less like your established roses.
In addition, I need to spray my roses down daily to avoid a spider mite infestation. Spider mites love hot and dry climates. The moisture the plant gets from being washed down creates a more humid environment than they like, so the infestation doesn't happen. Also, spraying down the roses, especially young roses, slows down the transpiration rate, the loss of moisture through the leaves, and allows the rose to take up moisture through the foliage. Young plants benefit more from being sprayed in the afternoons because they are not developed to the point where they can pull moisture up from the root zone to all of the top growth.
Temporary shade can be a yard umbrella or lawn chair posted over the rose till it grows new leaves.
Or you can use a tomato cage with a sheet pinned to it. I usually wet down the sheet to help keep more moisture around the plant.
I would hold off on any fertilizer until it puts out new leaves, and only use water soluble fertilizer weakly in the first year.
I do the same except for container plants. Even for those, it is wise to feed lightly and often.
In really hot 100 degree temperature like we've had since late May (and yes, it's zone 5), I wouldn't fertilize at all till things cool down.Cynthia
This is where we differ ...
I still feed my roses during the hot months. My summer temps are usually in the 90s and low 100s all summer long. Since I live in the mountains, it does cool off at night.
It's the time of the feeding of a rose that makes a difference. I cannot use many organics because I live in the middle of a forest. Using many organics is like serving a buffet to the wildlife ... some of which I
DO NOT want to meet up close and personal ...
I am not gardening in fertile soil, so I need to feed the plants during the summer months. The important part of the procedure is to feed the day AFTER the deep watering. The rose will take up what it needs and any excess will drain away.
Personally, I feel that I have to be responsible and not use too much nitrogen at one time because the excess will be drained into the water system.
Of course, mulching properly is important to maintaining plants during this type of heat ...