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The University of Minnesota has a wonderful web-site titled: "Selecting Hardy Roses for Northern Climates" at It displays a chart which provides many cultivars: Names; Class; Color; Bloom Repeat; Size; General Shape of the rose plant; Hardiness Zones; and Comments on disease resistance, etc.
https://extension.umn.edu/

Hello Debbie. Well unfortunately I believe you have been subjected to one of those nasty on-line scams. There are way too many of them... What you get are typically either seeds from some other plant or weed or in some cases just some hard clumps of root matter. Soak them in a glass of water over night. If the seeds disappear and all that is left is some grainy material and muddy water, well you know which one you got. Here is a link to some information on these scams: https://homegardenandhomestead.com/beware-of-fake-seed-scams-online/

For true rose seeds stratification check out this article: https://www.gardeningknowhow.com/ornamental/flowers/roses/growing-roses-from-seed.htm

I always dig out the soils in at least a 24 inch diameter and about 18 inches deep where old roses have been. Remove as much of the old root material as possible. Then mix the old soils about 50-50 with new bagged garden soils with mulch in it. I like the EKO brand bagged soils. Using the amended soils helps give the root systems of the new roses a fine new home. Water the new rosebushes in with some water that has both a product called Super Thrive and a Root Stimulator product in the water. Use a fresh batch of this water mix the next 5 to 6 times they need watering, it helps them get off to the best possible start and helps them deal with any shocks or stresses.

Are you talking about Half Standard roses? If so, yes. If the grafted on rosebush is a floribunda rosebush, trim off the spent rose bloom down to the first leaf cluster with the cane it is on where the cane appears large enough in diameter to support a new bloom. If the grafted on rosebush is a hybrid tea or grandiflora rosebush, trim the spent bloom off down to the first 5 leaf junction with the cane or at least to a good strong three to four leaf junction. If the grafted on rosebush is a shrub type rosebush or miniature rosebush, trim off the spent blooms down to their junction with the stem they are on where the multiple blooms formed. Watch for new growth coming on. If it is below the place where you originally pruned off the spent bloom, you may need to go ahead and prune off the canes down to just above the new growth. Link:https://www.roses.co.uk/half-standard-roses

Sawdust is used as a mulch on top of the soil. Mixing it into the soil will lead to nitrogen depletion, just the opposite of what you want. One concern I have is that roses are not heavy nitrogen users; indeed, too much nitrogen produces lots of leafy growth and fewer flowers. Nitrogen is primarily used on grass, perennials grown for their leaves and vegetables. If your roses bloomed in June, they may be resting and generating the energy it requires to send up the next surge of blooms.The following article addresses some of the reasons why roses don't bloom. https://www.gardeningknowhow.com/ornamental/flowers/roses/no-blooms-on-roses.htm

It looks like you have what is called a Grafted rosebush there. The bottom part of the graft is a hardy rootstock rose. There are times when the root stock tries to take over and sends up its own canes. If left to do as they wish, these canes will rob nutrients from the desired top part of the graft rosebush. So they need to be pruned out as close to the ground as possible. They will likely try to come back as well. So keep an eye on the bush and prune out that different looking wild growth.