1. Lilium michiganense (Turk's Cap lily) - the package says it needs a warm, moist period followed by a cold, moist period. So I'm assuming I should sow and keep indoors for a time and then put outside. But how long should I keep it warm?
2. I have seeds (purchased) for 3 gentians: Gentiana flavida, G. crinita, G. andrewsii. G. andrewsii was in the wintersown db as being successful. and the other 2 require cold stratification, so I should be ok, right?
Quoting:Look for these terms:
Needs Pre-chilling (freeze seeds, refrigerate seeds, stratify for x amount of day or weeks), Needs Stratification, Will Colonize, Self Sows, Sow outdoors in early Autumn, Sow outdoors in early Spring while nights are still cool, Sow outdoors in early Spring while frosts may still occur, Hardy Seeds, Seedlings can withstand frost, Can be direct sown early, Wildflower, Weed (such as butterfly weed, joe pye weed, jewel weed)
Gram - Tom Clothier has a great germination database at http://tomclothier.hort.net/index.html. It really helped me figure out which seeds needed warm first and how long to keep them indoors. It also helped me decide when I will sow each variety of seed.
For Lilium michiganense - Sow at -4 to +4ºC (24-39ºF) for 12 wks, move to 20ºC (68ºF) for germination
For Gentiana Flavida - Sow at 20ºC (68ºF), if no germination in 3-4 wks, move to -4 to +4ºC (24-39ºF) for 2-4 wks cover thin.
For C. crintia and andrewsii - Sow at 18-22ºC (64-71ºF) for 2-4 wks, move to -4 to +4ºC (24-39ºF) for 4-6 wks, move to 5-12ºC (41-53ºF) for germination cover thin
I would sow all of these in Jan. or Feb.
P.S. The C. crintia and andrewsii calls for warm first but from previous experience I find that it isn't needed.
Joanne, thank you for this link. So much great information out there. I've copied from Tom's DB into mine for all the seeds I have. I've sown my gentian's and I'll see what happens. If not successful, I'll try again next year.
thanks for your help. do you have an alpine/rock garden?
No rock garden Gram, but I seem to be really attracted to the alpine plants. I should try to make one this spring for all the WS seedlings that need that environment. Do you have one? If so, I would love to see some pictures!
grampapa: Very pretty garden area, and beautiful setting and surrounding area.
I also wanted to point out something about Trudi"s seed list. Just because you don't see a seed listed doesn't mean it can't be wintersown; It only means nobody has tried it and reported it. I just consider them good candidates, tried and true ones. Although WSing grows in popularity every year, there are undoubtedly seeds out there that haven't been tried. Trudi started this in New York, but undoubtedly folks in Florida will find some different ones to try. Now I know of at least one wintersower in Alaska , and there are people in Europe doing it too. That list is quite extensive but there are bazillions of seeds in this big world. If you have the seeds and want to give it a try, go for it! Then you can be the one to report that it does indeed work well for WSing.