Sorghum pollen loses its ability to grow and make seeds quickly after being released. Researchers found that dehydrated pollen collected at high humidity can still grow in a lab setting. But if the pollen is dehydrated at lower humidity and temperature, it won't grow or make seeds. Adding water back to the pollen doesn't help it grow. The pollen tubes that grow from the pollen grains wrap around the grains and have a fibrous material on their surface.