How to germinate Katsura?

seedmoneyDecember 12, 2013

I have collected some fresh Katsura (Cercidiphyllum japonicum) seeds from a 20 year-old tree planted as a memorial to a loved one. I have read on the Sheffield site that they germinate in 10 days at 70F. This has not been my experience. Help?
Thank you,

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I germinated them at 70F in common potting soil, in a pot that was covered in a bag to maintain humidity. I probably sowed 30 seeds in the same pot and only one germinated (I don't remember how long it took). After germination it is essential that you maintain even moisture. I did that by keeping the pot covered with a plastic bag.

They are not good seeds to germinate. But the plant is worth it.

    Bookmark   December 12, 2013 at 7:43PM
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brandon7 TN_zone(7)

I've always gotten very good germination rates ( >90%? ). I do it pretty much the same way. For me, these are some of the easiest seeds to germinate I've seen.

    Bookmark   December 12, 2013 at 8:12PM
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jean001a(Portland OR 7b)

Need stratification.

Lots of info if do search with
"germination of katsura tree seed site:edu" - but no quotes

Here is a link that might be useful: germination of katsura tree seed site:edu

    Bookmark   December 13, 2013 at 12:21AM
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brandon7 TN_zone(7)

"Need stratification."

Mine haven't! And, almost all sources say no pretreatment (which would include stratification) is needed. Stratification won't hurt, but I doubt it going to make a huge amount of difference. If the seeds aren't germinating, it sounds like there may be some problem somewhere (bad seeds, improper moisture, or something).

    Bookmark   December 13, 2013 at 11:57AM
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terrene(5b MA)

Apparently they sprout fine without stratification, but they seem to do okay with it also. I winter sowed 12 seeds in January that were collected at the Arnold Arboretum last fall. According to my records the first sprouted on April 5th. I got 2 seedlings last Spring, and they grew pretty quickly the first year - they are almost 2 feet tall. I'm not sure about this species hardiness but they're over-wintering in the garage with the rest of the babies and tender plants (Salvia B&B) anyway.

Here's a pic of the baby seedlings, May 11th -

    Bookmark   December 18, 2013 at 1:02PM
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mikebotann(8a SE of Seattle)

I collected a paper lunch sack full of Cercidiphyllum magnificum seeds. Then I made a couple of raised beds, and then sowed the seeds right away that Fall. Springtime came and the seed bed looked like I had sown grass. I eventually sold over a thousand of them. One order was for 600.
I haven't had to germinate any since because I get a few volunteers every year from the ones I have left.

    Bookmark   December 18, 2013 at 4:38PM
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