I hear ya about the heat. This year I really pushed the early envelope, starting the first four Packman on Jan 9 and setting them out Feb 10. Those made the prettiest heads of the four 4-packs I grew off at staggered times. The second four Packman were started Jan 16 and set out Feb 10. Nice heads too.
The two sets of four Green Giant were set out Feb 28 and Mar 10 and planted out Feb 28 and Mar 10 respectively. Still cool weather but 3" heads. Don't know whether it was the timing or how that variety does in my garden. It will get another chance in the fall.
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