Royal Botanical Gardens Peradeniya double coconut (Lodoicea maldivica): pollination and seed viability?

The Lodoicea maldivica specimens at Peradeniya—planted in 1850—are dioecious, possessing distinct male and female plants. Because the solitary female tree does not always flower simultaneously with the male catkins, botanists harvest pollen spikes from the staminate palm, desiccate pollen grains under silica gel, and store them at -20°C. When the pistillate flowers secrete receptive stigmatic fluid, curators scale cherry-picker lifts at 9:00 AM to hand-pollinate. The resulting bilobed nut takes seven full years to mature, weighing up to 20 kilograms, representing the largest wild botanical seed on Earth.