"..So how do farmers make sure their crops will produce enough fruit to make a profit? Crops in most parts of Australia have one main blooming period, usually in spring or early summer. The window forpollination usually lasts two to four weeks, depending on the crop. During that time, insects need to be flying around visiting flowers to feed on pollen and nectar to ensure that pollination happens. ..."
Read more here: Phys.Org