MadSci Network: Botany

Re: What are the black specks embedded in the pulp of some pineapple?

Date: Fri Dec 2 18:47:48 2005
Posted By: David Hershey, Faculty, Botany, NA
Area of science: Botany
ID: 1133514559.Bt

A pineapple is a multiple fruit or multiple-accessory so is derived from the
fruits of many flowers. The berries fuse with the rachis or stem of the
inflorescence to form the pineapple fruit.

If I bought a pineapple with "hundreds of small black seed-like items in the
pulp" I would return it and ask for another one or ask for a refund. Collins
(1960) says eating a seedy pineapple is like eating a normal pineapple
containing a thousand tiny bits of gravel. 

In another MadSci answer on pineapple seeds, they were described as "oval,
flatish, a dark 
gray-brown and about half the size of a grain of rice."  Rauh (1979) described
pineapple seeds as "small, thick, ovate (egg-shaped) brown or blackish." I
cannot tell from your description if they are definitely seeds but it sounds

How can you tell that they get larger with time? That doesn't seem like the
behavior of a seed in a harvested fruit but more like an insect or disease.

You could examine some of the suspected seeds under a microscope and see if they
have characteristics of seeds. You might also try to germinate them. The first
webpage under references has a discussion of germinating pineapple seeds.

If you live in the United States, you could contact your state cooperative
extension service and have them examine it.


Pineapple seeds


Re: Where are the seeds in a pineapple plant?

The Biology & Ecology of Pineapple (Ananas comosus var. comosus) in Australia

Collins, J.C. 1960. The Pineapple. New York: Interscience.

Rauh, W. 1979. Bromeliads for Home, Garden and Greenhouse. Poole, Great Britain:
Blandford Press.

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