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C/Ho/G-5 May 10

G

ARDEN

DOCTOR

by The Garden Doctor

There is no doubt that many people have had conversations with their houseplants, even me! Maybe there is good reason for that, a man in England grew a tomato with a world record weight of four and a half pounds. He claimed he fi tted it with a pair of headphones so it could listen to soothing music while it grew.

One of the most popular scientifi c experiments is whether or not plants react to music and if so, how? Although it has not been conclusively proven there is reason to believe that the vibration of music can affect the growth of plants. The idea fi rst arose in the 1970s, when Dorothy Retallack published her book “The Sound of Music and Plants”. Retallack conducted many experiments on plants and music. The main fi nding was that the type of sound used can affect the plants in either a positive or a negative way.

Using three separate labs containing the same species of plants, she began her experiment, by broadcasting different types of music to each plant. She recorded the daily growth of each plant. The plants in the lab where music was played daily for three hours a day grew twice as large and became twice as healthy as those in a controlled environment. Alternatively, plants in the other lab where music was played for a full eight hours a day died within two weeks of the start of the experiment.

She discovered that although plants react positively to soothing music, too much music could also have a detrimental effect. When Retallack tried experimenting with different types of music she found that plants did the best with classical, jazz and Indian classical music. The plants that did the worst listened to rock. The group that heard rock music became sick and stunted whereas the other group grew large and healthy. An interesting fact was that the group of plants listening to the soothing sounds leaned toward the speakers, just as plants usually bend towards the sunlight.

An important point from Retallack’s experiments is the duration of play of the music. If you are keen on playing music to your plants, keep the time limit to be about three hours, too much music and you can seriously destroy the plants. Although music is not an absolutely proven factor in plant development, Dorothy Retallack’s groundbreaking series of experiments, have advanced the musical development theory.

The results of this experiment encouraged many individuals to play music to plants with similar results. Many claimed that plants prefer classical compared to modern rock, which resulted in sick plants. Others claim that plants simply react to the stimulus, and can’t possibly react to different artists or styles of music differently.

In 2007, a South Korean researcher studied plant genetics and their reaction to stimuli. He discovered that sounds at certain frequencies speed up genetic activity within rice plants. Frequencies between 125Hz and 250Hz stimulate certain genes that help to give a plant’s DNA instructions for biological processes, such as growth. In addition, he found that volume doesn’t seem to be as much of a factor when

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C/Ho/G-2 Dec. 09

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C/Ho/G-7 Oct. 09

LASER ENGRAVE

by Dr. Kris

Talk kindly to your plants and ask them how they feel

it comes to plants. Low volumes of music were suffi cient to achieve the results.

So how does music affect plants? Music, like sunlight and wind, is a stimulus, something that incites action in plants. A property of living things is that they respond to stimulus. A woodlouse curls into a protective ball at the slightest touch, and sunfl owers turn to face the sun, maximizing their potential to absorb energy. Playing music to your plants provides a stimulus, and the plant reacts to the pressure waves produced by sounds. The sound waves created in music create tiny vibrations. Accordingly the vibrations from music and speech might actually stimulate the plant.

Many people who talk to their fl ower plants believe it not only helps the plants, but helps them as well. It’s believed to be particularly benefi cial for stressed out businessmen, though I suppose the trick is not to be overheard right? In a television interview in 1986, Prince Charles famously said it was “very important” to talk to plants and that they “respond” when spoken to.

In studies performed by the Royal Horticultural Society in England, researchers discovered that talking to your plants really can help them grow faster. They also found that plants grow faster to the sound of a female voice than to a male voice. They recorded ten people reading from either literary or scientifi c works, both men and women, and played their voices through a set of headphones that was attached to each tomato’s pot. The same tomato variety was used, with the same soil and care conditions. They also included two plants that were not read to, as a control.

At the end of the month, the plants that had been listening to female voices grew an average of an inch taller than those attached to a male voice. They said that they are unsure why the female voice worked better, saying that it could be that women may have a greater range of pitch or tone that affects the sound waves that hit the plant, and that sound, just like any other environmental factor, has an effect on plant growth.

Thanks to the evidence few would think you strange for playing music to, or even talking to your plants. I pondered this discussion with my rose bush recently, whilst we listened to Beethovens Symphony No. 6.

And remember if anyone asks you, just say that you were talking to yourself!

Dr. Kris

Garden Doctor Contact: dr.kris@ymail.com

C/Ho/G-9 Sept. 09

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C/Ho/I-05 May 10

Copyright © 2010 Dr. Kris

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