Seed Germination Videos: Time-Lapse Photography

A seed germination time-lapse squeezes several days of slow growth into a few seconds of video: the seed swells, a root pushes out and turns downwards, a hooked stem lifts the seed leaves, and the first green leaves unfold. You can film one yourself with an ordinary phone. Use fast seeds such as mung bean, long bean, kangkung or radish, sow them against the glass of a clear jar so the roots are visible, keep the phone and lighting perfectly steady, and take one photo every few minutes for two to five days.

Our seed germination videos

These are our own time-lapse videos, filmed from seed. Tap a video to play it.

What happens when a seed germinates

Timings below are typical for a fast bean such as mung bean or long bean at room temperature in Malaysia. Smaller seeds follow the same stages, sometimes faster, sometimes slower.

1. Imbibition

A dry seed holds very little water. Once it is wet, it soaks up water quickly and visibly swells. This restarts the seed's metabolism and it begins to use its stored food. On camera this looks like the seed "inflating".

2. The radicle

The first structure to break out is the radicle, the embryonic root. Whatever way the seed is lying, the root bends to grow downwards; this response to gravity is called gravitropism, and it is one of the most satisfying things to watch in a time-lapse.

3. Root hairs

Just behind the root tip, a fuzz of very fine root hairs appears. They greatly increase the surface the root uses to take up water. Against glass or paper they look like white velvet.

4. The hypocotyl hook

In beans, kangkung, radish, choy sum and many other vegetables, the stem below the seed leaves (the hypocotyl) grows in a tight hook. The bent "elbow" pushes through the soil first, protecting the delicate tip. This type of germination, where the seed leaves are lifted above ground, is called epigeal.

Some crops do it differently. In corn, the seed itself stays below ground and a protective sheath pushes straight up; this is hypogeal germination. Filming a long bean next to a corn seed shows the contrast beautifully.

5. Cotyledons

The cotyledons (seed leaves) are often a different shape from the true leaves. Kangkung's are deeply two-lobed, radish and choy sum have heart- or kidney-shaped ones, and beans have thick, fleshy ones that shrink as their food is used up. In light, they turn green within hours.

6. True leaves

The first true leaves appear between the cotyledons and look like a small version of the adult plant's leaves. From here the seedling feeds itself through photosynthesis, which is why light becomes essential the moment it emerges. Our guide to seeds that germinate without light explains more.

Guides25 Vegetable Seeds That Do Not Need Light to GerminateMost vegetable seeds sprout in the dark when sown at the right depth. 25 common crops with sowing depth and germination days, plus seeds that need light.

Best seeds for a time-lapse

Choose seeds that are fast, large enough to see, and reliable.

• Mung bean (kacang hijau) - very fast; the root often appears within a day.
• Long bean - fast, large, with a clear hypocotyl hook and fleshy cotyledons.
• Kangkung - quick, with distinctive two-lobed seed leaves.
• Radish, choy sum, pak choy - small but very fast; good for close-ups of root hairs.
• Corn - slower, but the best example of hypogeal germination.

GuidesHow to Grow Long Beans (Kacang Panjang) at Home in MalaysiaGrow long beans (kacang panjang) on a trellis in Malaysia — sowing, trellising, light feeding, organic pest control and picking without losing flowers.

GuidesHow to Grow Kangkung (Water Spinach) at Home in MalaysiaGrow kangkung from seed in pots, polybags or water. Sowing, watering, feeding, pests and cut-and-come-again harvesting for Malaysian homes.

How to set up the glass jar method

This method lets the camera see both roots and shoots.

1. Take a clean, clear glass jar or a clear plastic cup with smooth sides.
2. Line the inside with a layer of kitchen paper or blotting paper.
3. Fill the middle with crumpled damp paper, cotton or moist seed-raising mix to press the lining against the glass.
4. Soak your seeds for a few hours (large seeds) and slide them between the glass and the lining, 2–4 cm below the rim, with space between them. Position a few in different directions to show how the root always turns down.
5. Pour a little water into the bottom - about 1–2 cm - so the lining wicks moisture up. Don't flood the seeds.
6. Cover the top loosely with cling film with a few small holes, to slow drying while letting air in.

Rag-doll alternative: roll seeds up in a damp paper towel inside a clear zip bag and lay it flat on a dark background. It's easy, but the paper hides some of the root. Unroll it carefully to film or photograph each day.

Soil alternative: fill a clear cup or a seedling tray cell placed against glass with mix and press seeds against the side. You see roots through the side and shoots breaking the surface above.

How to film the time-lapse with a phone

1. Mount the phone firmly. Use a phone stand or tripod, or tape it to a heavy object. Even a tiny bump creates a jump in the video. Place the setup where nobody will knock the table.
2. Choose the interval. For the whole germination over 2–5 days, take one frame every 5–15 minutes. To show the root emerging in close-up, use 1–5 minutes over a few hours.
3. Check the maths. One frame every 10 minutes for 3 days gives 432 frames, about 18 seconds of video at 24 frames per second.
4. Pick an app. A phone's built-in time-lapse mode is fine for a few hours, but many choose the interval automatically. For multi-day recordings, use a time-lapse or interval camera app that lets you set the interval yourself.
5. Lock focus and exposure. In most camera apps you can press and hold on the subject to lock them, so the image doesn't pulse brighter and darker.
6. Get close, but not too close. Phones can't focus very near; if the image is blurry, move back a little or use a clip-on macro lens.
7. Keep it powered. Plug in the charger, switch on airplane mode or do-not-disturb, and check there is enough free storage.
8. Keep the phone cool. Keep it out of direct sun; a hot phone may stop recording.

Lighting: steady and from the front

• Use a constant lamp. Window light changes all day and disappears at night, which makes the video flicker and go dark. A small LED desk lamp left on for the whole recording gives an even result. If you see flickering bands in the image, try a different lamp.
• Avoid reflections. Light from the side, not straight at the glass, and put dark cloth or card behind the phone so it isn't reflected in the jar.
• Plain background. Black card shows white roots best; white card suits green shoots.
• Mind the direction. Seedlings bend towards light (phototropism). Put the lamp beside the camera so shoots grow towards the lens, not away from it.

Keep the lining moist during filming by adding water gently from the back with a dropper or syringe, without touching the jar.

Ideas for school projects

Change only one thing at a time, keep everything else the same, and photograph each setup daily next to a ruler.

1. Light vs darkness: two identical jars, one in a dark box. Both germinate, but the dark-grown seedlings become pale and stretched.
2. Gravitropism: once roots are 1–2 cm long, turn the jar on its side and film the root tips turning downwards again.
3. Phototropism: light the seedlings from one side only and film them bending.
4. Epigeal vs hypogeal: long bean next to corn.
5. Soaked vs unsoaked seeds: compare how fast okra or long bean seeds sprout.
6. Seed size and speed: kangkung, choy sum and long bean side by side.
7. Temperature: a jar in a cool, air-conditioned room against one at normal room temperature.

Safety: some seeds sold for planting are coated with a coloured treatment; never eat seeds meant for sowing, and wash hands after handling them. Throw away seeds that turn mouldy or smelly and restart with fresh water. Younger children should have an adult handle glass jars.

When the experiment is over, plant the seedlings in a tray or pot and keep growing them.

GuidesHow to Start Vegetable Seeds at Home (Beginner's Guide for Malaysia)Sow vegetable seeds in trays at home - the right mix, sowing depth, watering, light, preventing damping-off, hardening off and transplanting.

FAQ

How long does a germination time-lapse take to record? For fast seeds like mung bean or long bean, 2–5 days covers everything from swelling to the first true leaves.

Why do my seeds go mouldy in the jar? Usually too much water, too little air, or damaged seeds. Keep only the lining moist, leave small air holes, and remove any mouldy seed quickly.

Can I use seeds from the kitchen? Mung beans sold for cooking often germinate well. Many other kitchen seeds are heat-treated, old or hybrids, so results vary.

Why is the finished video jumpy? The phone or jar moved, or exposure wasn't locked. Fix the phone firmly, lock focus and exposure, and use a steady lamp instead of daylight.