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Pollinating cherimoyas is quite simple. All you need is a natural hair #2 paint brush, and a black film canister with a cap. Collect pollen from male flowers. Then pollinate female flowers. The male pollen is viable for 24hrs if put in the fridge. Check your cherimoya trees 2 a day once at around 7-11am and once in the afternoon 5-7pm (varies by location.