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Best to buy 100 seeds of chempedak. Try to germinate as many as you can and see what ones survive after growing outside. Out of those ones it may be 10 year or so until you even get a chance for possible fruit. Unfortunately many may never fruit in SoCal.
Here is a pic of 2 year old chempedak seedling in the yard in Florida. The higher humidity and warmer nights really help propel growth.
I kept one through a mild winter here which would be similar to there I imagine. Second winter was harsh and killed it. It grew well over summer.Mine looked different to nullzero’s. It had duller leaves than jackfruit and was ‘hairy’.I had tried earlier with bought potted plants and they always died soon after planting. The answer was planting seeds in place.
I had some nice Chempedak seeds from Han Sen as well but they were dug up and eaten by some animals.