Last year I started all of mine inside mid March. It was about a month earlier than I should have. They did fine, but I have lots of grow lights to keep them under. And while the plants were bigger (12-18" tall) when I put them out - I didn't see much difference in when they started blooming, and I had an extra month of babying them inside. I am going to wait until mid April to pot them up this year.
I do think its worthwhile for me to get them going inside, as opposed to waiting and planting unstarted tubers in the ground. Even if I get only two extra weeks of bloom time, thats two extra weeks of a big grin on my face.
