Yes I grow these huge lemons about 6in in diameter and they are shaped liek an orange. And yes nature will naturally run its course in pollination as long as its out side or insects are able to get in your green house
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"And the lemon flower is sweet, But the fruit of the poor lemon, Is impossible to eat."
All flowering plants have to be pollinated. But citrus trees are self pollinating and don't require pollinating from a different tree.