Line the bottom of each tray with a piece of kitchen roll folded to fit, or with a layer of cotton wool. Sprinkle a similar number of seeds in each tray. It doesn't matter too much if you use a generous number of seeds or a light sprinkling. But fewer seeds means you can do the experiment again - I usually manage to get two runs of the whole thing out of one packet of seeds.
Pour water into three of the trays. Don't put any water in the last one. Observing a few minutes each day, for about 1 week Each day, take the trays out of the boxes remember which tray came from which box , and have a look at what's happening to the cress. Prompt your children to observe and describe what they see, especially the differences between the cress in the different trays.
Encourage them to think about why the seeds are doing what they've seen, and why the cress in different trays is growing differently. See What to talk about for suggestions.
Water the same 3 trays as before the two trays from the boxes, and one of the trays in the open. Don't water the last tray the second tray in the open. Put the trays back into the same boxes they came from, and close the boxes. Rotate the trays that are in the open, so they get light from all sides. Extending the experiment a few minutes each day, for about another week You can extend the experiment by taking the trays out of the boxes and placing them in daylight, and now watering all the trays.
Each day, have a look at what's happening to the cress now. What to talk about Prompt your children to observe what's happening to the cress and think about why that might be happening, by asking questions such as:. At the beginning, when the seeds are just sprouting Is anything happening to the seeds in this tray? What about the seeds in that tray? Why do you think the seeds in the other trays are growing, but the seeds in that one aren't?
What's different about the tray where the cress isn't growing? Why do you think seeds don't grow when they're in the packet? How do they know to start growing? When the cress has started growing What can you see happening in this tray? What differences can you see between this tray and that tray? Once the cress has grown What colour is the cress in the tray in the open?
What about the one from the box? Can you see any other differences between the cress in the open and the cress from the box? Which one is taller and which one is shorter? Why do you think the seeds in the box did that? What do you think the seeds in the open have, that the seeds inside the box don't have? Where do you think the seeds in the dark thought they were?
What do you notice about the cress in the box with the window? Why do you think they did that? Extending the experiment What's happening to the cress in each tray now? Why do you think it's doing that? What to expect After you've set the experiment up, it will take a couple of days for the seeds in the trays being watered to start sprouting:. What's going on. Wet and dry Like us, plants need water to survive. Light and dark Whereas we need to eat food to get energy to survive, plants get their energy from light.
Light from the side The cress in the box with the window gets plenty of light through the hole we cut in the side of the box. Thinking like a scientist. Observing, then asking "why? Controlled trials If we're trying to work out what things plants need to grow, it's no good just planting seeds, watering them, giving them daylight, and seeing them grow. Variations Add an additional tray in the fridge I sometimes add another tray of cress, with water but putting it in the fridge. Like the tray inside the box, it doesn't get any light.
But the cold slows the growth significantly. So, unlike the cress in the box which grows quickly, the cress in the fridge barely grows at all. Other types of seeds Cress is a good choice, because it's very easy to grow and makes this experiment very reliable.
Rock Cress are grown from seeds. They can be directly seeded into your flower garden, or seeded indoors for transplanting later. Seeds have a long germination period, requiring two to three weeks. Balraj Bonete Teacher. How do you eat cress? Use raw garden cress or watercress to lend a peppery flavor to salads and sandwiches.
Cook cress as you would spinach. Blend cress with scallions, yogurt or buttermilk and serve with salmon. Saaid El Bouhali Teacher. What Halim seeds? Garden cress seeds , also known as aliv or halim have a peppery, tangy flavour and a good aroma. These seeds are loaded with nutrition and once you know about their benefits, you will surely make them a part of your diet. Neda Willecken Teacher. How fast does rock cress grow?
They bloom four to six weeks, which is twice as long as the popular creeping phlox. Plants rarely grow taller than 6 inches and may spread as far as 24 inches. Almost all Aubrieta have mat-forming, gray-green leaves that hold their color and remain alive all four seasons. Franciszek Varenne Teacher. How do you care for Cress? Watercress prefers a position in light shade, but will grow well in a sunny position, providing the soil or compost is wet.
It needs to be kept moist all year round, so grows well in damp or wet soil or a container that sits in a deep saucer filled with water. Himad Djirin Reviewer. How do you grow cress with kids? Sprinkle a teaspoon of cress seeds you can buy these from a garden centre onto the wet cotton wool and press them down gently with your finger. Place the cress heads in a warm, light place, like on the windowsill, and wait for your seeds to grown into tiny, delicious bushes of cress!
Marinka Vemuganti Reviewer. How long chives grow from seed? Sow chives in the garden or set out divisions as early as 4 to 6 weeks before the last frost in spring. Jitka Tarelho Reviewer. Why do seeds not need light to germinate? This is because the seedlings start photosynthesising once they are out of their seed coat.
Your seedlings will then use the sugar as food to grow. So there you go - seeds do not need sunlight to germinate , which is useful because they are normally planted in the ground! Sharai Ladinig Reviewer. What is the fastest way to germinate seeds? When you look at it this way, you merely have to get water to the embryo faster to make the plant germinate faster. Place the seeds in a food-grade plastic container and pour hot distilled water over them. Ecology and evolution. Fertilisation and cell cycles.
Inheritance and genetics. GM and Selective breeding. Movement in and out of cells. Nutrient cycles. Plant cells and tissues. Plant growth, health and reproduction. Plant nutrition. Plant responses and hormones. Products of plants. Respiration in plants. Transport in plants. Plant disease. Maths and computer modelling. Energy stores and transfers. Motions and forces. Physical changes. Particulate nature of matter. Atoms, molecules and ions. Elements, compounds and mixtures.
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