Another newbie question

Hi Got another question:
When my oldest iris bloomed this year I was getting 2 flowers per bud. When the first flower started to fade the second opened up. Has anyone had any experience with iris doing this? My amaryllis also bloomed with 5 flowers to each stalk instead of the normal 4. What I'm wondering is if it's something in the soil or the air or maybe in the rainwater?
Thanks Shell
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