Ngâm hạt trong dung dịch oxy già pha loãng (nếu muốn). Cho hạt hoa hồng lên vật liệu ẩm ướt. Cho hạt vào tủ lạnh trong vài tuần. Lấy hạt ra khỏi tủ lạnh.

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A mixture of water and hydrogen peroxide may reduce the growth of mold on the seeds. Stir 1.5 teaspoons (7 mL) of 3% hydrogen peroxide into 1 cup (240 mL) water. Keep the rose seeds in this solution for at least one hour.  Some studies suggest that a little mold growth can actually help break down the casing surrounding the seed, but this treatment is still recommended to prevent mold growth in larger amounts. A light dusting of anti-fungal powder for plants is an alternative to this step. Rose seeds typically won't sprout unless they are kept in cold, wet conditions, mimicking a winter environment. Place the seeds between two layers of lightly dampened paper towels, or in a container of dampened salt-free river sand, peat moss, or vermiculite. This is the first step in a process called stratification. If you are using store-bought seeds and the label says they are already stratified, skip to the planting seeds section below. Put the seeds and moist material in a plastic bag or seedling tray in a plastic bag or seedling trays, and keep them in a cold area of a refrigerator, such as an otherwise empty crisper drawer.  Do not keep them in the same area of the refrigerator as fruit or vegetables, which can release chemicals that prevent the seeds from developing. Keep the seed medium slightly damp. Add a few drops of water to each paper towel whenever they begin to dry out. Try to do this around the time that the seeds would normally start to germinate, such as in early spring. Make sure that the environment outside of the fridge is about 70 degrees Fahrenheit. The seed will not sprout until you take them out of the fridge. Depending on the rose variety and individual seeds, the seeds could take anywhere from four to sixteen weeks to germinate. Often, 70% or more of the seeds never sprout at all.