I just planted all of mine as seeds one inch deep in 12" pots and they all 30 of them came up in about two to three months. It was about this time last year when I started them. They grew to about two foot tall, some runts about eight inches. I planted some in 4" pvc pipes that I’ll just cut with a skill saw on each side to get them out. Others I found it was easy to just make round paper pots with house wrap. I just cut and rolled loosely around a 4"pipe then stapled the end seams. I’m planting the taller ones this year in a couple weeks. I still have some brush to clear out of the way and the ground is still frozen anyway.