Why are my zinnia plants growing such small flowers?

Carol mansfield
by Carol mansfield

I bought a really large bag of zinnias from amazon ,I don't know the brand name. I thought they were med / large in size. Since I had so many I planted too many and they are super crowded, so I have been thinning them out. I was just wondering why they are growing so tiny with tiny flowers. Are they growing tiny because they are over crowded or because the seeds are just a small variety. Can they be stunted that much from overcrowding. Signed the learning gardener.

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