PLANTING RASPBERRIES FROM SEEDS To plant raspberries from seeds, sow the seeds in a plastic peat pot starting in mid-winter. Push the seeds about an inch deep into the soil, and plant the seeds about an inch apart from one another. Cover your raspberry seeds with a thin layer of sand. Store in a dim and cool place indoors, such as a pantry or even a garage. Keep the seeds moist by spraying with a spray bottle as needed. Once temperatures reach above 60F, place your raspberry pot outdoors. After 4-6 weeks, the seeds should start to germinate. Once they've started to develop leaves and have grown about one inch in height, transplant them in a big pot or in the garden. Once transplanted, cover the base around the plant with mulch. This will keep the soil nice and moist. Right after planting, make sure to water!