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I think title of the thread was probably supposed to be seedlings, not seedless.
Now you spelled oops wrong ( bad joke)I would have gave up on the kwai muk seed after 3 months.I did have some P hypoglauca seeds sitting in vermiculite for about 9 months beforeI scarified the seeds. All germinated within 4 weeks. The shell was very thick and I hadto use a knife and actually went too deep and took out a little meat. It still germinated.I wonder if that would have sped the process with the kwai muk seeds? I am anxious to to try it again on some stubborn seeds
GA3 is a naturally occurring plant hormone that just kick starts germination. I have 4 large fruiting trees of which 3 came from seeds sent from this forum's main moderator. Some did sprout straight away. I thought they would take longer to fruit than they actually did take.
Mind if I add on? Like fruitlovers said, artocarpus does not have a hard shell and should sprout within 2 weeks to 1 month. Once this gets bigger, I plan to graft it to jackfruit.