Thank you everyone! Sorry about the delay. Once I logged off I couldn't find my way back in until now.
To answer the questions,
-I don't use chemicals, just compost and aged manure, mulched them over the winter.
-The irises are grown on the fence side, next to a public lane, very far away from other yards or gardens.
-The irises I have were gifted by other gardeners, I was told they were Siberian and bearded irises. The first batch I received were Siberian Irises and the second were bearded irises. I didn't get to see the Siberian irises bloom in their original garden but was told they were dark purple. The bearded irises were dark purple and bright yellow. My friend took a picture of their blooms to see if I liked them. I am pretty sure they're yellow and purple.
I am in Calgary, Alberta, Canada. It's zone 3 here and I have clay and alkaline soil, very typical in Calgary.
Recently, a mutual friend gave me some yellow irises, came from her garden. I will plant half of them and give half to a neighbor down the street. Then we will compare results next year. If mine turns out white while my neighbor's comes out yellow, it must be the soil.
