Rainbow Celery

by Deb on May 20, 2011

Rainbow Celery

This was supposed to be Rainbow Chrysanthemums, but after waiting a week our chrysanthemums are still stubbornly white and light purple. So I put a stalk of celery in and ta-dahh, rainbows in minutes. I’ve done it before with carnations and here it is with lilies, but at this time of year here chysanthemums are it, and they don’t want to play.

But it’s still a cool activity with celery. It’s best if you get stalks with leaves, once again the curse of limited shopping struck and I could only get trimmed stalks but you get the idea.

The activity is simplicity itself:

water

Pour water into two glasses with straight sides.

cut flowercut celery

Split the stalk of one of your flowers or celery sticks lengthwise.

colours

Put different colours in each glass of water, trims the ends and put your stalks or flowers in. Put the split stalk in both glasses.

And then wait. As you can see our flowers are being stubborn, but the celery up the top changed in just a few minutes. The leaves will colour beautifully, or if you’re like us and stuck with mainly stalks you can still see little spots of colour in the top of the celery.

What’s happening

Plants lose water through their leaves and petals. This changes the pressure and draws more water up through their stalks, the xylem vessels are those little dots. The water carries the nutrients and food the plants need with it.

By splitting the stalk you can show they go straight up and service their own part of the plant, rather than having a circulatory system like animals. This is why plants can survive having parts cut off, or why sometimes part of a tree dies and the rest is healthy. The flow is all straight and independent.

And then it’s safe to eat, beautiful coloured celery is sure to be popular on the plate.

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{ 2 comments… read them below or add one }

Elena Boughen via Facebook May 20, 2011 at 7:51 am

Love it!!! Might do some for hannah’s party 🙂

Reply

Science@home via Facebook May 20, 2011 at 11:25 am

I was really impressed how well the celery worked out, leafy stalks would look great.

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