When grown for nuts, care must be taken to select cultivars that are compatible for pollination purposes; although some cultivars are marketed as " self fertile ", they will generally fruit better with a different pollination partner.
2.
Few flowering plants self-pollinate; some can provide their own pollen ( self fertile ), but require a pollinator to move the pollen; others are dependent on cross pollination from a genetically different source of viable pollen, through the activity of pollinators.
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