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Trouble with Thalictrum

(Pam) Warren, CT(Zone 5b)

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?



Calgary, Canada

I suspect that they need a longer stratification period.

(Pam) Warren, CT(Zone 5b)

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

Galesburg, IL

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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