Starting Rose Seeds Before growing roses from seed, the rose seeds need to go through a period of cold moist storage called “stratification” before they will sprout. Plant the rose bush seeds approximately ¼ inch deep in a seed-planting mix in seedling trays or your own planting trays. The trays need not be more than 3 to 4 inches deep for this use. When planting rose seeds from various rose bush hips, I use a separate tray for each different group of seeds and label the trays with that rose bushes name and planting date. The planting mix should be very moist but not soaking wet. Seal each tray or container in a plastic bag and place them in the refrigerator for 10 to 12 weeks.
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