"Paul B" wrote in message
...
I'm in south eastern Michigan so it will be dying at the first hard frost.
If I learn how to collect seeds (how?) or if I buy them, is it better to
just plant them in the garden next year and try and differentiate between
a Zinnia sprout and a weed, or should they be started in pots and
transplanted?

Mine reseed themselves every year. Only problem is each year they're
taller. This summer they're at least 3 1/2' tall. I started with the little
10" to 12" ones some years ago.