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GIVING ROOTS AN OBSTACLE COURSE It will be fun to play tricks on some roots! We have glass jars with a layer of gravel in the bottom, and some potting soil. We'll put some rocks and some small pieces of wood into the jars, then a little bit of potting soil on top of them. Then, we want to lay some seeds on the soil right above the rocks and pieces of wood, and next to the glass, then put about one-half inch of wet potting soil on top of the seeds. What do you think will happen when the seeds germinate and roots start to grow? Will the roots grow right into the rocks or the pieces of wood? Make sure the soil is kept moist, so they will germinate and grow well. Let's check on them each day, and make notes about the way the roots grow. At the same time, let's germinate some seeds on a blotter and put obstacles onto the blotter to see what that makes their roots do. We can even change the places of the rocks after the seeds have little roots, to see if the roots turn the corner to go around the rocks. Do you think that the reason plants don't grow well in rocky soil is because the rocks get in the way of root growth?  Any problems with this page? Send URL to
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