Weed Seeds Float Or Sink

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Just curious if it makes a difference as far as if the seed is good or not if it sinks or floats? Can you test seed germination viability by floating the seed in water? How reliable is this method and does it work for all seeds? Have you ever wondered why some seeds SINK when placed in water, while others FLOAT? The answer has a lot to do with the seed coat and…

Does it mean amything when seeds float vs sink?

I don’t think the good egg/ bad egg rule applies here. Never tried germinating my seeds in a cup of water.

GoinGreen09
Member
Dirtyboy
Well-Known Member

Soak them for 24 hrs and plant them sink or float or regardless how they look.

Float or sink they may still grow.

RichED
Well-Known Member

dont throw a non floater away i have a few steps
1- underwater first night on heating pad in dark most split then to soil
2-dont slit then soak under peroxide overnight slit to soil
3-dont slit pour off liquid leave between napkins for abup to a week to split and go to soil
4-dont split after week start scarcification includes sandpaper picking pieces of husk off scraping the little cover over seem off and fanal dont like to do but have done succesfully must be carful not to injur inside has a high success rate is to split with exacto knife at seam easy easy

for finish stages at about 99 5 success rate after step 3 at about 75 % after step 3 i feel like nothing to lose and actually improve percentages step 4 has a lot to do with how i feel but always get better numbers after if i have to go that far

growone
Well-Known Member

i had always heard that sinkers are the good seeds, takes a while for good ones to sink, usually a few hours
all my sinking seeds have germinated

RichED
Well-Known Member

i dont do float thing at all i use bottom of beer cup about 1/2 of it then trace folded paper towel till it opens like a book cut out put bean in it i have a tarced piece of terry cloth i use one on bottom to hol mois terry on top keeps it below water anyway nekt day if not split take off top terry pour out water leave in moist paper towel on top of moist terry to hold moisture no need to keep misting all the time

Floating Seeds in Water – Is This a Good Seed Viability Test?

How do you know if your seeds are still viable? Simple, do a seed germination test. Place the seeds in some water. The ones that sink are still viable – the ones that float are dead.

This advice is all over the internet so it must work? But how reliable is it?

Floating Seeds in Water – Is this a Good Seed Viability Test?; source: Pens & Pencils

Do the Floating Seed Test Properly

If you check out a number of sites that describe this test you soon realize that there are several different ways to do it. Some people add soap to the water to reduce it’s surface tension. Others put the seed in a jar and give it a good shake or they might soak the seed for 24 hours before doing the test.

There is no agreement on how to do the test properly. That means the test results reported on social media are not very reliable since they rarely include the details of the method used.

There are also silly claims like “this method is not 100% accurate and it only works with freshly harvested seeds of certain fruits such as melon, watermelon, cucumber, squash, peppers and tomatoes”. There are thousands of different types of seeds. Why would it only work on some vegetables and what does “not 100% reliable” mean? Maybe it only works 10% of the time?

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Another site says, “the test only works for melons or cucumbers if the seeds are fresh and have not dried out.” So it doesn’t work on purchased seed. This same site went on to state that you need to ferment tomato seeds to get them to germinate, and I have already shown that this is a myth.

This gardening technique is so poorly defined that it is not possible to know how to do it correctly.

Citizen Scientists – Floating Seed Test for Viability

A number of gardeners have done tests to see how well the floating seed test works.

Pulsatilla albana ssp. armena – the Pulsatilla ‘seeds’ are actually fruits – achenes with “fluffy tails”, source: BotanyCA

I had some red pepper seeds from a store bought fruit and tried floating the seeds without drying them. Half floated and half sank. I removed the floaters and used them to try the test again. Half floated and half sank. I then tested this last group of seeds for germination. The ones that floated and then sank had 8/10 germinate, and the ones that floated twice had 3/10 germinate. So it is possible that floaters have a lower germination rate, but the floaters in this test were certainly not all dead.

I tested some Camassia seeds; 38 of 48 (79%) sinkers germinated and 12 of 16 (75%) floaters germinated, after a month in the fridge using the baggy method.

Someone from our Garden Fundamental Facebook Group tested Briza maxima (quaking grass) and found better germination with floaters.

Marijuana seed that floats will germinate on top of the water in 24 hours.

Twelve different kinds of pepper seeds were tested in this video and both floaters and sinkers had good germination.

I’ve germinated quite a few clematis seeds and most of them have fussy tails. They all float. Many seeds have this characteristic including some grasses and pulsatilla.

Both floating and sinking peppers seeds germinate, source: Daisy Dawes

The top picture in this post shows two jars. The one on the left contains black pepper seeds – they sink. You can distinguish them from papaya seeds that float, and are frequently added to spices since they look like black pepper but are much cheaper.

Science on Seed Viability Using the Water Float Test

Acorns have very low germination because many seeds don’t develop completely inside the nut and because various pests lay their egg in viable seeds which are subsequently eaten by the larvae. Floating them is a common way to eliminate many of the non-viable seeds. Even with this test, too much agitation of the water will cause viable seed to float.

Juniperus polycarpos, the Persian juniper, also produces a low number of viable seeds. Floating in water is not a reliable means of separating the good from the bad, but floating in a sugar solution does work. Sugar water has a higher density than water and this difference can be used separate seeds of various densities. The heavier viable seed sinks.

The float test “works well with hard-seeded peas in the family Fabaceae (e.g. Daviesia, Chorizema, Gastrolobium and Gompholobium) and Mimosaceae (e.g. Acacia), and has also been used on species in Hemigenia with good success. Do not attempt this test on seed of Allocasuarina. Allocasuarina seed is mucilaginous. This means it has a mucous membrane around the seed that gets very sticky on wetting.”

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Arabidopsis seed forms a sticky mucilage on the outside of the seed as it absorbs water. Mutations of arabidopsis have been found that don’t produce this coating, allowing them to be separated from normal types with a float test. This is an example where within a single species, some seed floats and some does not, depending on genetics that has nothing to do with seed viability.

Arabidopsis wild seed (WT) sinks while a mutation (mum) floats. The floaters germinate in 24 hours siting on the water, source Helen M North

“Wheat was used in one set of experiments, and the average of all tests showed a germination of 68.3 per cent for the sunken seeds and 72 per cent for those that floated. In another set of experiments lentil was used, and it was found that 75.4 per cent of the sunken seeds and 86.7 per cent of those that floated germinated.”

The floating characteristic of seeds depends very much on their weight, surface coating, shape and specific gravity. Some seeds do develop a large seed coat which can be empty and these likely float. The specific gravity of a seed is controlled by the environment (moisture) and internal enzymes and hormones. Some dead seeds sink, while some spongy seeds like spinach float even if viable.

Does The Seed Float Test Work for Testing Viability?

There are cases where a float test can be used to identify viable seed, but when science reports on these they are quite specific about the type of seed and the method used.

On the other hand gardeners tend to simply lump all seeds into one category and say they all work, without specifying the method that works.

As a general rule, gardeners should assume that the float test does NOT work for testing seed viability, unless there is evidence it works in a specific case.

A Better Way to Test Seed Viability

Use my baggy method if you want to test seed germination. You will actually see the root come out of the seed and know for certain that the seed is viable.

Weed Seeds Float Or Sink

Are Marijuana Seeds Good When They Float in Water?

Table of content

As anyone who has ever tried to grow marijuana knows, getting the seeds to germinate can be a tricky process. There are a lot of factors that come into play, and if even one is off, it can mean the difference between a bountiful harvest and a disappointing one. So when you’re trying to germinate your seeds, you’ll take any edge you can get. Which is why some people swear by the float test.

Should my marijuana seeds float?

Marijuana seeds are often used in various types of water pipes and are known to float. However, some people believe that marijuana seeds sink in water. There is no right or wrong answer to this question, as it depends on the specific water conditions and the type of marijuana seed.

Are seeds viable if they float?

Marijuana seeds float in water, but are they viable? The short answer is that it depends on the strain of marijuana.

Some strains of marijuana are more prone to floating and others are more prone to sinking. However, most strains of marijuana can be viable if they sink in water.

How do you tell if a seed is good or bad?

Marijuana seeds can sometimes float on water and look like small, white pebbles. If the seed is rotten or has fungus growing on it, it will sink to the bottom of the water droplet quickly. Healthy marijuana seeds will float on top of water and take a while to sink.

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Why do some seeds float on water?

Have you ever wondered why some seeds sink when placed in water, while others float? The answer has a lot to do with the embryo and the seed coat. The embryo is responsible for the seed’s buoyancy. The embryo consists of a layer of cells that accounts for 65% of the seed weight. This layer of cells contains air pockets, which make the embryo more resistant to sinking and helps it stay afloat on water. Additionally, this layer of cells contains oil globules that give the seed its characteristic greasy texture. The seed coat is made up of tough layers that protect the embryo and absorb water. These layers also contain air pockets and oil globules. When water enters these pockets, it creates a force that pushes up ward against the surrounding layer of oil globules, making the seed float on water.

How long do you leave seeds in water?

One of the key questions when it comes to growing marijuana is whether or not you should leave your seeds in water. Many people believe that if the seeds are left in water they will germinate and grow. However, there is no definitive answer as to how long you should leave the seeds in water before removing them. Many growers recommend leaving the seeds in water for anywhere from 12- 24 hours before rinsing them off and planting them. The length of time that you leave the seeds in water will largely depend on a few factors such as temperature, humidity, and light availability.

What happens when seeds are soaked in water?

When seeds are soaked in water, they will start to sink. This is because the water will fill up the spaces between the seeds and cause them to sink. The water will also cause the seeds to swell, which will make them heavier and cause them to sink even more.

Can seeds germinate in water only?

Some people believe that marijuana seeds should not be submerged in water because they may sink to the bottom. True or false, does this theory work?

The answer is both yes and no. The truth is that some of the seeds will sink to the bottom while others will float, but it doesn’t matter because they all end up growing marijuana plants either way. What matters more is how well the seed was soaked in water and if it has any mold or fungus on it. If there are any contaminants on the seed, then exposure to water can cause problems such as mold growth or even cell death.

It is generally believed that marijuana seeds are good when they float in water. However, there is no scientific evidence to support this claim. While some people believe that sinking seeds are more viable, there is no guarantee that this is the case. It is also important to note that bad seeds can float as well, so it is not a foolproof method of determining seed quality. If you want to soak your seeds in water, it is recommended that you do so for 24-48 hours before planting them. This will give them time to germinate and start growing into healthy plants.

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