When growing garden vegetables I typically try to plant in 2 ways. For instance when planting zucchini, I plant a start and also plant a seed next to it at the same time. Depending on the timing, the weather etc. some years the start does fine, some years the start dies and the seed does fine, some years they both do fine. But either way I guarantee better success by doing both.
I think the same type of thinking would work good for you since you don’t seem to have lots of experience growing roses to know what works in your specific garden. I would suggest trying to grow the rose from seed, from root stock, AND buying a plant. You can try all 3 and see what works best for you. That would hopefully guaratee a harvest as well. The goal is to harvest rose hips, not just experiment.
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