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The curling under of leaves can be caused my the Sawfly whom injects a substance into the leaves after laying her eggs that makes them curl to protect the eggs. It can also be cause by other egg laying insects. The best way to get at them is by use of a systemic insecticide. I recommend using some Bayer Tree and Shrub Granules applied per the label instructions for Ornamentals/Shrubs/Roses. I have had great success with this product. I use Green Cure fungicide which is a earth friendly fungicide and spray either early morning or early evening once the temps have cooled a bit. Remember to water your rosebushes well the day prior to any pesticide application or even fertilizing them. A well hydrated rosebush is far less likely to have any sort of negative reaction.

Not really. The timing has to be just right to get them to sprout at all. Also if you bought rose seeds on-line be aware that many of them are unfortunately a scam to get your money.... Some are weed or other plant seeds while some are just small clumps of organic matter that will never do anything. Here is a link to an article about starting roses from seed for you: https://www.gardeningknowhow.com/ornamental/flowers/roses/growing-roses-from-seed.htm

Water the rosebush well. Then give it a treatment of either Bayer Tree & Shrub Granules or the ones made specifically for rosebushes. It could also be that a neighbor hood dog has peed on the rosebush as that will cause the same effects you have described. In that case, prune off the effected leaves and water the rose well. Water the rosebush with some water that has both a good root stimulator in it and a product called Super Thrive in it. Do this the next 4 to 5 times the bush needs watering and relief should be seen.

If it is a vine weed like Bind Weed, yes it can. The weed steels nutrients from the rosebushes both at the root zone and chokes of some of the sunlight the rosebushes need. Thus it is best not to allow the vines to grow up and around the rosebushes.

The Bayer tree and shrub granules I mentioned in my other answer to your other question should help with this as well. I would also spray the rosebushes with a product called Green Cure at the Cure Rate every 7 to 10 days for a while to get funguses under control. http://greencure.net/

I would give all of your rosebushes a treatment of Bayer Tree & Shrub Granules. This product has both a fertilizer and an insecticide/disease control element to it. The fertilizer helps give the rosebushes strength to help fight stresses and shocks and the systemics move up through the root system and into the roses natural juices to get after the insects that like to munch on and skeletonize the leaves. Apply per the label instructions for Shrubs/ornamentals. The blooms may be effected by some thrips as to why they wilt quickly. Water the rosebushes well the night before any insecticide or fungicide treatment. Then water again lightly after the application.