Guava trees are close to being pestiferous. Birds drop the seeds liberally and guava groves appear almost magically.
"Shrub or tree from tropical America, with yellow or brownish lemon-shaped and sized fruit, pink or cream colored inside.
Used for jam, jelly and juice. Introduced by Don Marin before 1825, now naturalized and common."
Dr. Gerald (Gerry) Carr, Emeritus Professor of Botany, UH Manoa