Start parsley seeds indoors eight to 10 weeks before the average date of your last spring frost. Sow a pinch of seeds in a 2-inch pot by sprinkling the seeds on the surface of the seed starting medium. Sprinkle about 1/8 inch of additional growing medium on top of the seeds.
Grow the parsley seeds under fluorescent grow lights until about three weeks before the average date of your last spring frost. Raise the level of the lights as the seedlings grow to keep the lights about 3 inches above the tops of the parsley plants.
Harden off the transplants by putting them outdoors for a longer period each day over a period of a week, until the plants are outdoors all day and night.
Transplant parsley plants into the rose garden about seven to 10 days before the last spring frost. Situate parsley plants at least 6 inches outside the drip line of the rose bushes. Parsley can also be planted as a border in the rose garden. Space individual transplants 6 to 8 inches apart in a double row for a border.