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how long is a cannabis seed viable

Is Your Seed Dead or Alive – A Seed Viability Test

A “Seed Tag” usually accompanies seed purchased from seed companies. This tag tells the buyer several things: 1) what variety and species is in the bag, 2) a lot number which tracks where the seed was produced, and 3) information such as the percent purity, percent inert material, percent weed seed, percent noxious weed seed and percent total germination.

Unfortunately, not all seed comes with a tag. Any seed that has been set aside from harvest to be planted for next year’s crop will not have this information. One- or two-year-old seed should be fine to plant, but what if a producer had some seed from 10+ years ago that they wanted to use?

Fortunately, there is a simple way to test seed viability.

  • A petri dish (plastic, shallow, flat, clear dish) or a ziplock bag
  • A lid for the petri dish
  • A paper towel
  • Plastic wrap
  1. Moisten a piece of paper towel with water and place it in the petri dish;
  2. Evenly place 10 or more seeds on the paper towel. You may want to fold the towel over the seeds so both sides of the seeds are moist;
  3. Place the lid on the dish and wrap tightly with plastic wrap;
  4. Place in a warm environment (i.e., kitchen counter); and
  5. Wait for 7 to 10 days, then check the dish for seeds that have visibly germinated (i.e., sprouted) and count them.

Example:

Species: Eltan WW

PLS: 80%
Desired seeding rate: 12 seeds/ft row or 50 lbs. /A on 12-inch spacing (St. Andrews Variety Trial Seeding Rate)

The seeding rate of bulk seed: 50/0.80 = 55.5 pounds of bulk seed

Therefore, you will need an additional 5.5 lbs/acre of seed to reach either the desired 12 seeds/ft row or 50 lbs/acre based on a PLS of 80%.

For help with converting lbs/acre to seeds/ft row, lbs/acre to seeds/acre or vice versa for both, please visit our Crop Tools & Calculators page and check out the Seeding Rate Converter calculator.

Germination and Viability of Weed Seeds After 2.5 Years in a 50-Year Buried Seed Study

In 1972, a 50-yr study of seed longevity was initiated at Stoneville, Mississippi. Weed seeds were collected from 20 locallygrown species and mixed with soil. Replicate samples were placed in polypropylene screen envelopes and buried at soil depths of 8, 23, and 38 cm. Seed germination and viability were determined by germination tests and 2,3,5-triphenyl-tetrazolium chloride (TTC) treatments with recovered seeds. In general, the depth of burial had little effect on seed longevity. Based on the averages of the means at the three depths, the percentages of seeds still viable after burial for 2.5 yr were: spurred anoda [ Anoda cristata (L.) Schlecht.] 71%; purple moonflower (Ipomoea turbinata Lagasca y Segura) 71%; johnsongrass [ Sorghum halepense (L.) Pers.] 62%; velvetleaf (Abutilon theophrasti Medic.) 58%; goosegrass [ Eleusine indica (L.) Gaertn.] 33%; hemp sesbania [ Sesbania exaltata (Raf.) Cory] 29%; Texas panicum (Panicum taxanum Buckl.) 24%; common cocklebur (Xanthium pensylvanicum Wallr.) 18%; common eveningprimrose (Oenothera biennis L.) 14%; large crabgrass [ Digitaria sanguinalis (L.) Scop.] 12%; sicklepod (Cassia obtusifolia L.) 10%; common purslane (Portulaca oleracea L.) 10%; white morningglory (Ipomoea lacunosa L.) 8%; redroot pigweed (Amaranthus retroflexus L.) 7%; prostrate spurge (Euphorbia supina Raf.) 6%; prickly sida (Sida spinosa L.) 5%; redvine (Brunnichia cirrhosa Gaertn.) 3%; Florida beggarweed [ Desmodium tortuosum (Sw.) DC.] 3%; barnyardgrass [ Echinochloa crus-galli (L.) Beauv.] 1%; and chickweed [ Stellaria media (L.) Cyrillo] 0%.

How long is a cannabis seed viable

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Date and time: Tue, 01 Mar 2022 13:24:22 GMT