Tag Archives: testing

How to Test Germination Rates in Seeds … Did our six year old lettuce seeds germinate?

Seed germination rate testThis Black Seeded Simpson seed was packaged in 2014 and we just did a germination test. We placed on a wet paper towel under bright light (lettuce needs light to germinate) at 70°F for 24 hours, covered in darkness overnight and found germination! Six-year-old lettuce seed properly stored germinated! It amazes me the life that is contained in one little seed.

Doing a quick germination test like this prior to ordering seed can save you the hassle and money of purchasing new seed. To calculate your germination rate, take the number of seeds that germinated (evident by the radical root emerging from the seed casing) and divide by the total number of seeds you put in your tray — that will give you the germination rate of your seed.

Because I use rockwool for hydroponics, we can use seeds from this germination test and transfer them into wetted rockwool and continue to grow them in ideal seed started conditions (warming mat to 70°F and bright lights). No seed is wasted! This also helps me conserve my rockwool.

Germinated seed awaits going into rockwool

To transfer germinated seeds, I take a tweezer with (the kind with a flat edge) and clean them with rubbing alcohol and finish off with a quick rinse of water. I gently pick up each germinate seed with the tweezer and drop it into the hole of my rockwool making sure to not plant the seed too deep. General rule of thumb whether sowing soil or into another planting medium like rock wool is to plant seed as deep as it is wide. I sometimes use the plastic tip of my nearby plant marker to slide it off of the tweezer tip as we don’t want to crush the seed embryo (still inside seed casing). I also plant two seeds per rockwool cube (in case one doesn’t make it for some reason.) I can always thin out to one plant as the seed grows into a seedling.

If you want tips on how long seeds can last when properly stored, check out our handy guide here.

Happy Growing!
— Erin

 

PS: Food for thought… Jesus said you need only to have faith in Him — even if it’s as small as a mustard seed… Think of how much life is just within a little tiny seed. The giant redwood tree, for example, comes from something that is so tiny… if God can create a magnificent and awe-inspiring tree, how much MORE amazing and beautiful are you who is made in His own image.

Redwood Seeds Scale to a Dime giant-redwoods

“He told them another parable: “The kingdom of heaven is like a mustard seed, which a man took and planted in his field. Though it is the smallest of all seeds, yet when it grows, it is the largest of garden plants and becomes a tree, so that the birds come and perch in its branches.””
‭‭Matthew‬ ‭13:31-32‬ ‭NIV‬‬
https://www.bible.com/111/mat.13.31-32.niv