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It sounds like you have a grafted rosebush, which is a hardy rootstock rose and the the rose you bought it to be grafted onto that root stock. The shoot that came up that was different was from the hardy root stock. If the entire bush has now taken on that same nature and appearance, then the upper desired part of the overall bush has died somehow and will likely not return. In such a case it is best to dig out the entire bush and replace it with a rosebush that you like and desire to grow.

Here is a link to an article I wrote on this topic for you to read: https://www.gardeningknowhow.com/ornamental/flowers/roses/rose-deadheading.htm

Knock Out and Home Run roses do not need to be deadheaded unless you want to. I deadhead mine as I like to keep them looking tidy. If you do deadhead them, prune off the old spent blooms as close to the base of the old bloom as you can. This is especially true of the Home Run roses as they push out new buds so very close to the base of the old blooms. Cutting things off too far down with sacrifice many future blooms.

A few things come to mind. 1. Leaf scorch from reflected sunlight hitting the foliage that acts like a magnifying glass on the foliage. 2. A local dog or cat is relieving themselves upon the roses foliage causing foliage burn. 3. Over-spray from an herbicide drifting over onto the roses foliage. 4. Insecticide spray that has either been mixed a bit too heavy or has stayed upon the foliage too long due to cloudy weather, thus burning the foliage. 5. Last and the least likely, the rosebushes have not been getting enough water and are letting leaves die in order to preserve its life as best it can. Now you will need to investigate and see if any of these items fit your situation. Let me know if I can be of further help. Here is an article for you to check out as well: https://www.gardeningknowhow.com/ornamental/flowers/roses/brown-edges-on-rose-leaves.htm

Stan The Rose Man :)

Thank you for sending the photos. The rose tree looks dead to me. Something must have gone way wrong before you got it if it looked the same way when you got it. I would contact the company you got it from ASAP and send them the photos as well. I don't know if they will have any left to send you for this season but should give you a credit to get a replacement for next year. So sorry....

Here is a link to an article I wrote on this topic for you to read: https://www.gardeningknowhow.com/ornamental/flowers/roses/rose-deadheading.htm

Knock Out and Home Run roses do not need to be deadheaded unless you want to. I deadhead mine as I like to keep them looking tidy. If you do deadhead them, prune off the old spent blooms as close to the base of the old bloom as you can. This is especially true of the Home Run roses as they push out new buds so very close to the base of the old blooms. Cutting things off too far down with sacrifice many future blooms.

The amount of alfalfa meal used depends upon the size of the pot. For medium sized pots, I would not use more than 1/4 cup. For larger pots I would use 1/3 cup. I only use 1/2 cup for my in the ground plantings.