Purple Rose Seeds 10 Heirloom Rose Seeds This is a perennial rose bush that grows to 4 feet in height and 3 feet wide. Its a sturdy plant, with upright bushy habit and mid to dark green, glossy leaves. Does well in zones 5-9, in colder areas simply plant in pots and bring inside for winter. Rose seed germination tips: Rose seeds need cold temperatures to initiate the germination process, so place the seeds in a plastic bag in the veggie crisper drawer of your fridge for about 60 days. Mark your calendar so you know when its time to take them out. There are many ways to plant the seeds once they finish their Make sure indoor temperatures are at least 70 degrees F. (21 degrees C) and keep the lights on for about 16 hours daily. In areas of the country where spring temperatures are above 70 degrees F. at that point, you can plant them in flats and set them outside. Whichever method you try, be sure to keep the soil moist, but not dripping wet. When the seedlings begin to grow, the first two leaves that appear are cotyledons. The next leaf will look like a rose leaf. Amazingly, some of these seedlings may flower in as little as 5 to 6 weeks, although some take a full season to bloom. After the first true rose leaf appears as mentioned above, carefully transplant the new rose into a separate pot. Within three years you should have a fully mature bush.