My NAT tree is seeding very well. At this stage, all the seeds are a healthy green. If anyone has experience as to the viability of these seeds and when to pick them, I'd appreciate hearing your comments.

I believe the seeds have a very short life span. My own experience has been a 'dead' seed when left on the tree to brown, then held for a month or so. If they are sold in catalogues, they must be 'fairly old'!

Maybe they should be picked when still green?

If anyone has a tree, I've had excellent results with 'air layering'.