Gardening Science: Investigating Germination
Intro: Gardening Science: Investigating Germination
The germination of seeds is a perennial* subject in science classes around the world.
Seeds are planted somewhere, they germinate, the students look at them.
The hard part is looking at what you are growing.
The point of this project is to provide students, teachers and interested parents with a starting point for investigating the germination of small seeds, in a way that makes them easy to see and record, using reclaimed hardware.
*Sorry
Seeds are planted somewhere, they germinate, the students look at them.
The hard part is looking at what you are growing.
The point of this project is to provide students, teachers and interested parents with a starting point for investigating the germination of small seeds, in a way that makes them easy to see and record, using reclaimed hardware.
*Sorry
STEP 1: Such a Complicated Set of Equipment...
You need an old "jewel" CD case*, some paper towel or tissue, and some seeds (these are poppy seeds we harvested a couple of years ago).
*You'd be amazed how much science can be done with recycled scrap!
*You'd be amazed how much science can be done with recycled scrap!
STEP 2: Preparation
The CD case has a "liner". You should be able to prise it out with your fingers, but, if your nails are very short, you may need a small blade to get between the inner and outer parts.
Pull out the liner, and discard it and any labels responsibly. Depending on your local waste disposal services, both should be recyclable.
Pull out the liner, and discard it and any labels responsibly. Depending on your local waste disposal services, both should be recyclable.
STEP 3: Growing Medium
You need something to hold the seeds in place.
The easy way to do this is with a pad of tissue paper or paper towel, pressing the seeds against the CD case lid. The amount you need depends on the thickness of your paper - I needed two paper towels, folded into eight, with a little trimmed off the end.
Make sure you put the towel in the end away from the gap left by the liner.
The easy way to do this is with a pad of tissue paper or paper towel, pressing the seeds against the CD case lid. The amount you need depends on the thickness of your paper - I needed two paper towels, folded into eight, with a little trimmed off the end.
Make sure you put the towel in the end away from the gap left by the liner.
STEP 4: Just Add...
...whatever you need.
I dampened the towel with tap water, and laid the poppy seeds in a line, because all I am testing here is whether the seeds will germinate, or be fed to the birds.
I dampened the towel with tap water, and laid the poppy seeds in a line, because all I am testing here is whether the seeds will germinate, or be fed to the birds.
STEP 5: The Science Bit
What to investigate?
For such simple equipment, there is a lot of good science you can do, as long as you have a number of CD cases.
You could:
For such simple equipment, there is a lot of good science you can do, as long as you have a number of CD cases.
You could:
- Investigate the ideal amount of water needed for germination.
- Investigate the best temperature for germination.
- Investigate what happens in different lighting conditions (especially after germination) - different amounts, colours and directions).
- Leave one in your car door pocket to see if vibration affects germination.
- Dissolve different amounts of fertiliser in the water.
- Once the seeds germinate, try turning the cases over for different amounts of time to investigate the effect of gravity on plant growth
23 Comments
sunshiine 10 years ago
sunshiine
Kiteman 10 years ago
sunshiine 10 years ago
sunshiine
Kiteman 10 years ago
kirnex 10 years ago
I've read several articles online about this--mostly farming research done by co-ops. Definitely something worth checking out. I'm currently designing a vertical permanent garden structure, so I won't be able to test it myself until next year, I suspect, but I plan on trying it out. You can google "seed germination smoke exposure" for more information about it.
Kiteman 10 years ago
See AngryRedhead's comment about damaging seeds - it seems that poppy seeds often lie dormant until the soil is disturbed (hence the poppy fields of WWI). I don't know how to simulate that on damp paper...
AngryRedhead 10 years ago
If you wanted to make the project slightly more interesting (well, in my opinion at least) and introduce more variables, you could discuss scarification which is a requirement for some seeds. For instance, bluebonnets set seed in the spring and then go through the heat of summer before germinating in the late fall, staying dormant through the winter, and growing rapidly in the spring. The summer heat naturally starts the process, but if you accidentally forgot a bag of seed you collected and didn't get it down soon enough, you could scarify it with acid to mimic what naturally happens. Another example is that some seed need to go through a chilling process before germinating such as Sarracenia (and possibly your poppies depending on the variety), and there are even seeds that are fire activated. The problem with testing some of this is that some seed suppliers scarify the seeds for the consumer, so you'd have to ensure that you got "raw" seed.
If you wanted to avoid all that and have nice big seed that are easy to germinate and observe, cilantro would be a good choice. I can buy a big bag of unroasted coriander from the Indian grocery store for pretty cheap, and I've had good luck using them as seed - much cheaper than buying packets.
Kiteman 10 years ago
dakota1301 10 years ago
dakota1301 10 years ago
-Dakota K.
Niftythrifter Blogger
Tarun Upadhyaya 11 years ago
Kiteman 11 years ago
They're from poppies we grew ourselves, but a lot of commercial flowers have infertile seeds, and these have been badly stored for a couple of years, so I'm just testing to see if they're worth sowing, or shall I just feed them to the garden birds.
spooledup7 11 years ago
Great instructable.
Kiteman 11 years ago
bajablue 11 years ago
I'm going to use a jewel case for germinating grapefruit seeds.
ericCycles 11 years ago
Pomegranates don't take as long to grow from seed and don't have thorns.
bajablue 11 years ago
Kiteman 11 years ago
bajablue 11 years ago
jessyratfink 11 years ago