Does a guava need another guava to pollinate?

Answer 1

The guava (Psidium guajava) flower can be self-pollinated and produce fruit (about 15.9% set), but cross-pollinating increased fruit production up to 39.5%. If you have a home garden, it isn't important to have another tree, but when considering a commercial production, it is imperative that there be different cultivars to assure cross-pollination and increased fruit production.