Perennial seeds like a period of cold before being started. If you’re starting any perennial, cold stratify them for 3-6 weeks before you plant them. Take the seeds, place them in your fridge, then remove after a few weeks. This simulates the conditions perennial seeds go through outdoors during the winter, and helps break down the hard coat on the seed, giving you a much higher germination (and success rate!) when starting them indoors.