I didn't cold stratify my seeds and had about a 50% germination rate with these seeds last year direct sowing them in large whisky barrel pots. The seeds that sprouted grew incredibly beautiful plants/flowers. This year, they came back with a vengeance! I let them self seed in the pots and this year they are absolutely amazing. My barrels are overflowing with them. Easily one of my favourite garden flowers to grow.
Amazing variety and plentiful seeds! Our zinnias are just starting to bloom and colour variation is incredible!