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Timing of germination

Albany, ME(Zone 4b)

For the second year now lobelia cardinalis seeds that I planted in flats in March germinated in mid July. I'm wondering if some seeds will only germinate when the days are getting shorter instead of longer. Does anyone know? If so, can we find out which ones are which?

TIA
LAS

Columbia Station, OH(Zone 5a)

http://www.backyardgardener.com/tm.html

Seed Germination Database see if this site works for you...it tells soil temp and days till germ. plus other things
gammy3

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