question on maple germination problems

Galien, MI

I posted a question with a picture in the propagation forum, and someone recommended I put it here. I didn't know how to transfer it, so I copied the link. I'd love some advice on why maples don't drop sterile seeds, or why some sterile seeds can look identical to good seeds. A tree I collected from had 1 in 20 viable seeds, and half of those looked perfectly good.

http://davesgarden.com/community/forums/p.php?pid=5705241

Thanks.

Northumberland, United Kingdom(Zone 9a)

It could be a ploy to deal with seed predators. If a squirrel has to go through lots of apparently good seeds before it finds one worth eating, it may give up in disgust and go elsewhere.

Resin

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