I also made up a calendar from seed packets and online seed vendor's recommendations.
Since those only talk about "weeks before and after last frost" they "should" apply equally to everyone, everywhere. But of course, since they ignore all the interesting variations, they are equally likely to be off by one to four weeks for everyone, everywhere ... equally!
Here is what I came up with for some things i was interested in at the time.
Take everything here with a grain of salt. Some vendors suggest "4-6 weeks before" for plants that other vendors recommend "6-8 weeks before" for.
I think that some of these variables would make HUGE differences. Are the seed vendors assuming ideal conditions, or average amateur conditions?
- "greenhouse air temperature"
- "germination soil temperature"
- "day length under lights"
- and especially "light intensity indoors"
