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Testing seeds for germination rate

Posted by Victoria Gagliano
Wednesday, March 18, 2009

image by WTL photos

Early spring…an emergent time of year when plants wake from winter dormancy to soak up sunlight of longer days.  I walked around the house yesterday searching for signs of spring, finding perennial chives reaching up and up, bobby yellow primrose blooms peeking between downy leaves, and fleshy tulip shoots poking layered leaves through mulch.  I am excited for the spring bulbs especially.  I planted over 70 tulips and my Dad planted more than this in daffodils and crocuses.  When I purchased them last fall, they were on sale, so I got nearly twice as many as I had intended to plant.  I have visions of a sea of spring flowers, it’s almost time.

It’s also the time for checking all those leftover seed packets you may have stored, from last year’s garden. Better to check old seed than waste money buying new.  But are these seeds viable?  Some seeds last many years if stored properly.  Proper storage involves keeping seed dry and away from direct sunlight.  I have stored my seed in small Ziploc bags in the freezer, but now keep them in wine box on a shelf. Others store theirs in shoe boxes in a cool room.

How to test seeds
I have found that lettuce only lasts for two seasons, even though some websites say otherwise, whereas beans, arugula, morning glories, and Swiss chard seem to be indestructible.  Tomato seed is a mid range keeper. You can test the potency of your saved seed by doing a viability test with some paper towels, a gallon size Ziploc bag and about a week’s time. After gathering all seeds to be tested, here’s what to do:

  • Place seeds in a double row down the center of a moistened paper towel.  I place about 10 of each variety within a small space on the towel.  I can fit 10 varieties on each towel, 5 in each row.
  • Record name and amount of seed as your key.
  • Fold edges over seed rows.  They’ll look like French doors.
  • Spritz again and seal in a large ziploc bag. Put in dark place.
  • Number of days till germination varies, but after about a week, check your seeds.
  • Divide the number of seeds germinated by the total number for each variety.  This will give you a percentage of viability
  • For seeds with a low percentage, plant thickly, for seed with a high percentage, plant thinly.

Last year I culled a lot of old seed and bought new, trying to be moderate in my seed order.  They’re so enticing, “Of course, I’ll have time and space to plant 8 kinds of lettuce! Sure…” but I don’t have the space, or the time to devote to a full-time garden.  What I do have is experience planting certain vegetables that we eat a lot of or neighbors are happy to accept: lettuce, tomatoes, pole beans and cucumbers.  Last year I successfully planted 4 months worth of lettuce!  I’ll do the same this year.  Lettuce is expensive in the supermarket, and a packet of seed is only 3 bucks!  With water and consistent weeding, homegrown lettuce is tastier and exponentially cheaper than store-bought lettuce. 

Here’s a list of high quality seed catalogs:

Are you gearing up to start your garden?  Have some favorite varieties of seed or a helpful resource?  Please share in the comments.

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(JavaScript must be enabled to view this email address)  on  03/22  at  08:30 AM

Victoria really enjoyed your article.  Although my husband is the gardener in our family (I play a very lowly part mostly weeding though he says this is very important!).  Your comments regarding the taste of home grown lettuce are so true and though I’m having to buy store lettuce at the moment, from May till late autumn we have an abundance of multi-coloured delicious lettuce in the garden.  We are deep in the country but strangely since living here for over five years we have not seen one rabbit in our garden - thank goodness.  If the lettuce start to sprout too much I make a delicious lettuce, pea and mint soup.  We are still getting the occasional night frost so our tiny greenhouse is bulging at the seams.  Outside chives, rosemary and thyme are thriving - glorious spring!

(JavaScript must be enabled to view this email address)  on  03/22  at  10:56 PM

Thanks for your comment Terry! I agree with your husband, weeding is just as important as every other aspect of gardening. Without space and water to grow, seedlings would never make it to maturity and onto our plates. It is amazing that in temperate climates, lettuce can be grown for a full half year. All of my lettuce seeds germinated,so I will start these indoors and try to salvage my test specimens too for eventually transplanting outdoors.

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