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Starfruit pollination -- hand pollination required?

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barath:
My starfruit trees love to produce flowers but never seem to set.  I grafted them years ago to Kari and Sri Kembangan but they never set.  They're in relatively large containers (probably 30 gallon) and grow nicely and flower nicely but never set fruit.  I've tried giving them various nutrients, including withholding nitrogen, but it hasn't worked.  I've also crudely tried to hand pollinate, but that hasn't gotten them to set.

Is there a trick to getting them to fruit?  A time of day to pollinate?  What stage of flower should I pollinate at, if any?

I know usually people don't hand pollinate, so I'm wondering what might be wrong here.

pinkturtle:
I don't know which variety I had, I brought it from the nursery next me.  It happened to me before.  The first two years flowers only, no fruit.  It started bear fruit in the third year of flowering.

palingkecil:
I have a Sri Kembangan for 4 years.
The first year it had so many flowers, even set some small fruitlets, but all dropped.
Second year it flowers like crazy again, but only held one fruit to maturity.
On the third year it held about 7 fruits. It was in a 20 gallon pot, I just moved it to the ground this year.
I notice the pollinator is usually smaller bees and wasps.
It also hold more fruits when I reduce the water.
It blooms twice a year, but only holds fruit from fall through winter for me.

barath:
Ah, great.  Thanks -- so I guess I need to wait more.  They've been flowering for a couple of years at this point, so I hope they'll start holding fruit soon.

bsbullie:
I have witnessed (and picked) fruit of all varieties grown in 3 gall pots at nurseries.  They routinely flower, set and hold fruit to maturity on small trees (3-4+ feet) in 3 gallon pots.

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