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Seed Germination: Trouble with Thalictrum

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Forum: Seed GerminationReplies: 3, Views: 22
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(Pam) Warren, CT
(Zone 5b)

April 3, 2012
6:56 AM

Post #9067931

Years ago at another garden they self-sowed prolifically in pots near where they had flowered, but I can't seem to make that happen indoors. I soaked the seeds 48 hours in 9:1peroxide water with a drop of Superthrive, then did the paper towel/baggy trick 1 week warm, 2 weeks cold in the frig. Then on 3/11 I took them out of the frig and planted them in a 3" pot in seed starting mix, more peroxide water, more Superthrive, and put the pot in the biodome over a heat mat. Nothing.

Suggestions, anyone?



April 3, 2012
8:06 AM

Post #9068036

I suspect that they need a longer stratification period.
(Pam) Warren, CT
(Zone 5b)

April 3, 2012
9:21 AM

Post #9068136

Do you thInk a month is enough? Do you think they might germinate in the frig, like penstemon does?

Galesburg, IL

April 3, 2012
10:12 AM

Post #9068203

What temperature is your heat mat set on? Most references say to germinate around 65-70 degrees. I would give them another 2 weeks to see if they will germinate and then if none, put them back into the fridge for another 4 weeks. It is possible they will germ in the fridge, checking them once a week should be often enough. Trying to shorten the stratification will work for some species, but for others I never get germ.

They germ so easily/readily outdoors because of the longer stratification period and the varying temps/moisture outside. If I have bad luck with something I'm trying to stratify indoors, I will usually also winter sow some so that I have a backup. I will also double sow (indoors and outdoors) if I am trying some new plants and have no experience with germinating them.

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