Lisa, that's how onion sets are sold around here too. One place that sells Dixondale always has the wrong day (intermediate day) Red Candy onions. Short day onions are what we need to grow here.
About your question, I have been thinking about that too. I'm thinking the pro mix I used may not be rich enough?
One year, I started a tray of onion seeds in leftover potting mix from tomato plants that I didn't plant out - it worked fine.
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