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Even self-fertile varieties, Olson says, will produce much more fruit with a little help from its friends.

While some varieties may be self-fertile, many fruit trees require a second variety blooming simultaneously for cross-pollination, so you’ll need space for not one, but two plants.

While many container varieties are self-fertile, you’ll get even more fruit when you grow more than one variety.

Originally native to China, this self-fertile selection can be counted on to reliably produce a crop of gorgeous berries in Pacific Northwest gardens.

But this connectome was for only one sex, the hermaphrodite — a self-fertile individual that is considered the worm’s female equivalent.