I grow many papayas, but I've never had this one. Form what I know this hybrid is sterile. Any papaya should star flowering at 75-100 cm. Like I said deep pot will make it grow fast and bloom soon. Unfortunately winter is coming so expect a very slow growth. TH thing is if you put them in a big container now they will die. You won't be able to control your watering. So I suggest you to transplant them in a 6 litres container until spring, then move them to a big one.
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Thanks, will do as you recommended