Rose seeds need to go through a process called cold moist stratification to break inherent dormancy. If you have already done this, how you plant is a personal decision. Only 20-30% of rose seeds go on to germinate. Sowing them in a flat instead of individual containers takes up less room. The downside is that seeds need to be transplanted into their own container once they germinate. Here is an article that explains growing roses from seed: https://www.gardeningknowhow.com/ornamental/flowers/roses/growing-roses-from-seed.htm
Answered on February 19, 2019
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