Preparation
Purchase identical plants from a garden centre, DIY store or supermarket.
Equipment
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2 identical containerised plants (size, shape, health)
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2 larger pots (than the container plants)
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Well rotted compost from your compost bin
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Garden soil or John Innes seed compost
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Clear plastic bottle for watering container
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Sieve, trowels & gloves
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Equipment to record growth (paper, pencils, ICT)