Zinnias are really easy to grow from seed but they are a little temperamental when transplanted. I wintersowed some in March and although they grew really well in the milk jugs, the ones I transplanted from there look like crap compared to these that I direct sowed.
To plant them I dug 1/4 inch trenches, put the seeds in and covered them back up with dirt. I thinned them once they got about an inch tall. I didn't do that last year and as a result they were entirely too crowded which the foliage didn't appreciate. Aren't the the just-about-to-open ones cool looking?
I think I'll keep saving these and see just how many years I can grow Zinnia from the same seed line. I'm also very interested to see how different the color is. These seem more pink this year where I remembered them being more purple last year.
Have you had good luck transplanting your Zinnia? What's your secret?