Fill the planting tray with high-quality commercial potting soil. A mix created especially for seedlings is preferable.
Place the rainbow rose seeds in the tray and cover them with about 1/2 inch of potting soil. Rose seeds should be planted in late winter, about six weeks before the last frost of the season.
Spray the soil lightly with a mister. Slide the planting tray into a large, clear plastic bag and seal the opening with a twist tie.
Put the tray in a warm place that gets indirect light. Although you may not have to water the tray while it's in the greenhouse atmosphere of the plastic bag, it should be checked periodically. If the soil appears dry, remove the tray and spray the soil lightly, then return the tray to the bag.
Watch for seedlings to emerge and roots to develop. When they do, take the tray out of the plastic bag. This will take approximately 15 to 20 days. Move the tray to a sunny window and keep the seedlings moist.
Transplant the seedlings to small pots when it appears that they are beginning to outgrow the planting tray. After the danger of frost has passed, plant the seedlings outside in a location that gets full sun for most of the day.
(**Approximately 90% sprouting rate under stipulated environment.**)
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