Green Culture Singapore
Feature Article for March 2006
Text & Pictures from Joshua Koh
Online on 18 March 2006



Growing tomatoes in highrise apartments can be a challenge where there is a lack of natural pollinators. Here's a step-by-step guide where the apartment tomato gardener can follow to pollinate their crop's flowers to assist fruit set.

WHAT YOU NEED:

1 electric trimmer with its blade removed and compartment cleaned with alcohol wipe or cottonbud dipped in isopropyl alcohol.

1 cotton bud.

WHAT TO LOOK OUT FOR...

Newly opened tomato blossoms! That's how they look on the picture on the left.

TAKE A CLOSER LOOK...

The trimmer head with the central vibrating mechanism.

THE STEP-BY-STEP GUIDE TO POLLINATE YOUR FLOWERS

STEP 1:

Bring the trimmer head near an open flower and switch it on. This will cause the flower to release its pollen through sonic vibrations.

Tomato flowers are very specialised flowers where their anthers (which hold the pollen grains) are located far lower and inside the flower than the stigma (which receives the pollen grains to form fruits).


STEP 2:

Look for the collected pollen. They are the yellow dust that settles in the head of the trimmer.


STEP 3:

Bring your cotton bud to swipe around your trimmer's head to collect the pollen grains.


STEP 4:

A cotton bud head full of tomato flower pollen.


STEP 5:

Bring the pollen laden cotton bud to other tomato flowers.

Rub the cotton bud against the stigma of the flower (the very protruding part), especially the end of the stigma.


STEP 6:

Repeat for the other flowers. Repeat for each flower as necessary.


AFTER SUCCESSFUL POLLINATION

If pollination was successful, withn the next few days, the flowers will start to wilt and the ovary of the flowers will start to swell in size and the dried up petals will drop naturally to reveal a mini tomato! See below...


Above: Developing tomato fruits soon after pollination.

At this stage its important to esure that soil is evenly moist so that the fruit does not crack during development. Crushed egg shells can be added to the potting mix to prevent blossom end rot.


Above: Ripening cherry tomato fruits.

If you do not have an electric trimmer, use some other item that is capable of sonic vibration, such as an electric toothbrush where one use the attached brush or attach a cottonbud on it via masking tape and then employing the same steps detailed above.

For more info on sonication pollination and detailed pictures of the anatomy of tomato flowers, please visit the following website - http://www.pollinator.com/tomato.htm



ACKNOWLEDGEMENTS

Green Culture Singapore would like to thank Joshua for contributing this useful guide for tomato growers. This article was converted from a topic which Joshua started in the Green Culture Singapore discussion forum.




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