Weed Seed Germination Temperature

In order to produce marijuana buds, the cannabis plant needs to go through 4 growth stages like the germination stage, the seedling stage, the vegetative In this marijuana planting guide, we highlight several of the easiest and most efficient methods for successful marijuana seed germination. Cannabis seeds need only water, heat, and air to break dormancy and germinate; they do not need extra hormones, fertilizers, or additives. Seeds sprout

How Long to Germinate Weed Seeds?

In order to produce marijuana buds, the cannabis plant needs to go through 4 growth stages like the germination stage, the seedling stage, the vegetative stage, and the flowering stage. For the purpose of simplifying the process of cannabis cultivation to our readers thinking about becoming marijuana growers, in this article we’re focusing on the germination stage and how long it takes to germinate weed seeds.

Germination, or sprouting, is the first stage of cannabis cultivation during which the cannabis seeds are placed in water in order to develop sprouts. Some marijuana seeds may germinate while others won’t, and the sprouting success rate mostly depends on the quality of the seeds.

In order to increase the germination rate of cannabis seeds and increase the chances of successful germination, check out our guide below.

The 411 on Germinating Marijuana Seeds

Before you start cannabis cultivation and germinating seeds, you will definitely benefit from reading the following tips:

  • Purchase high-quality seeds from a verified seed bank.
  • Purchase growing lights required for the following stages like LED, CFL, or HID grow lights.
  • Use a heating pad underneath the seeds to help aid germination and maintain proper temperatures.
  • Pre-soak seeds in 1% hydrogen peroxide or compost tea for 12 hours in order to improve germination or kill pests.
  • Keep the marijuana seeds under a temperature of about 72 degrees Fahrenheit (22 °C).
  • Keep the seeds away from your windows and direct sunlight.
  • Purchase jiffy pellets or starter plugs for germinating weed seeds.

How Long Do You Need to Germinate Cannabis Seeds

The time needed for seeds to sprout is not always the same, but if you’ve provided your cannabis seeds with the right conditions, germination should usually start between 12 to 36 hours after you’ve soaked the seeds. Warmth, moisture, and darkness will accelerate cannabis seed germination, and the whole process can be over within 5 to 10 days (during which the seeds will be completely out of their shell). The more ideal your germination environment is, the faster your cannabis seeds will start to germinate.

Choosing a Germination Method

There are a few ways that you can germinate your seeds and the most common ones include:

  • The paper towel method;
  • The glass of water method;
  • Planting directly into the soil.

The Paper Towel Method

This germination method is one of the easiest ways to germinate seeds and it only requires paper towels soaked in tap water. The two pieces of paper towels are soaked in water, and the cannabis seeds are placed between the sheets. Additional water should be added so that the seeds are moist, and excess water should be drained away. Furthermore, the temperature in the area where they’re kept should be between 70-90°F (21-32°C).

Once the seed splits and a sprout appears, you’ll know that the seed has started germinating. The sprout is called the taproot, and it’s a sign of successful germination. After the seed starts to split, make sure you’re very careful with the taproot when planting it, and don’t touch the seed as it begins to split.

The Glass of Water Method

This is the most common germination method for beginner growers since all it takes is placing the seeds in a glass of water. The seeds should be placed in a half-filled glass of water at a temperature of about 71°F (22°C), and the seeds will start sprouting between 3-5 days and develop taproots. After the roots reach 2–3 mm they should be transferred to soil pots, and over time the germinated seeds will develop into cannabis plants.

Keep in mind that not all seeds will germinate. Some seeds will sink to the bottom and some will float. The ones that float are probably not viable, and they need to be thrown away. Use tweezers when transplanting the taproot into a growing medium, and start preparing the proper lighting system for your marijuana plant.

Planting Directly Into the Soil

This germinating technique isn’t recommended for beginner cannabis growers since they need to be informed about the proper nutrients, appropriate pH soil, and humidity levels that the growing medium should have.

What you’ll need in order to plant directly into the growing medium are pots filled with premium-quality soil that’s been soaked in water. This method of germinating cannabis seeds prevents moving the seeds when they’re at their most fragile state, and that’s exactly the reason why most experienced growers prefer it.

What to Avoid When Germinating Cannabis Seeds

If you are planning to grow your cannabis plants from seeds and germinate them, you’ll need to avoid some common mistakes that cannabis growers make.

Letting the Germination Medium Dry Out

While germinating, always make sure that the paper towels stay moist. This is especially important if you have a heat source placed above the germinating seeds. It’s better to opt for rock wool cubes germination as opposed to hydro since it helps retain moisture.

Avoid Overwatering

Overwatering your cannabis seed may result in bud rot and ruin the potential for the cannabis seed to grow into a cannabis plant. Make sure you provide your plants with enough water, but not excess water.

Avoid Leaving Seeds to Germinate Longer Than They Should

If you end up germinating using the paper towel method, make sure you leave the seeds to germinate, and transplant them before the cotyledons appear. The best time to transplant is once the taproot is between 1-2 cm in length.

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Do Not Germinate Directly in Soil

If you’re a less experienced grower, don’t start by germinating in soil. You could always try germinating using the paper towel method, jiffy pellets, or peat plugs, which will make it easier to maintain proper temperature and humidity.

Maintain the Appropriate Temperature and Humidity for Germination

The right environment is essential for successful germination. Ideally, the germination medium should have a temperature of about 72 degrees Fahrenheit (22 °C) and 70% relative humidity. Lower values may make the germination less successful, while higher values might result in rot or fungus.

Plant the Seeds Correctly

The seed needs to be planted with the root facing down, so when it opens at the tip it lets out the root. The seed shouldn’t be buried too deep because the seedling may never emerge, or, on the other hand, if it’s too close to the surface, the stem can grow weak. Make sure that the top of the seed is just below the surface of the growing medium, and the root faces down.

Final Thoughts and Transplanting Germinated Cannabis Seeds

After the taproot appears, you can transfer your germinated seed into a growing medium and wait for the three stages that follow in the marijuana growth cycle. You can choose to grow in coco coir, hydroponic, or soil, depending on your preferred planting medium. Young plants are pretty vulnerable, which is why you should be extra careful when transferring them in the potting soil. As you grow more cannabis plants, you’ll learn more about the germination process, which will make you more confident each time you germinate new seeds.

Disclaimer

The information presented on this page is provided as a public service to aid in education and is derived from sources believed to be reliable. Readers are responsible for making their own assessment of the topics discussed here. In no event shall Leaf Nation be held reliable for any injury, loss or damage that could happen if using or abusing drugs.

How to Germinate Cannabis Seeds

Germination relates to the process of a new plant growing from a seed. It is the first step when adding to your cannabis garden. You can purchase the requisite seeds from a variety of sources. On the downside, it means that cannabis seeds vary enormously in quality. We recommend looking at reputable online seed banks to get your supply. However, please note that there are legal issues to contend with if you buy seeds. This is especially the case if you decide to buy them from a source outside the United States.

When buying seeds, opt for mature options with a dark brown appearance and a firm feel. Once you have them in your possession, make plenty of space for them to grow and thrive. Learning how to germinate weed seeds correctly is crucial to enjoying years of healthy plants and fruitful harvests. In this guide, we outline the ideal germination conditions and show you five different methods.

EDITOR’S CHOICE – Homegrown CannabisCo

Homegrown CannabisCo are the masters when it comes to seeds. Offering a massive variety of cannabis seeds that are well categorized, not only does this company create a resource for superb quality options including feminized seeds, it also provides extensive growing information for those looking for some support along their journey.

Ultimate Guide to Cannabis Seed Germination

In theory, germinating cannabis seeds is a simple affair. They only need three things: Air, water, and heat. The famed ‘paper towel’ method is incredibly easy as long as you follow the steps outlined below. Here is a quick overview of the best germination practices before we show you the various methods.

Water

Be careful not to over-soak your seeds. Hard seeds should be soaked for a maximum of 32 hours, although 24 hours is usually enough. Soaking too long can damage them. Marijuana seeds begin to sprout when they receive the twin signals of water and heat.

Once the right conditions occur, the taproot starts burrowing through the shell of the seed.

If the root breaks through the shell and there is no water, the seedling will die. Keep the roots moist once the seed sprouts, and make sure there is ample moisture at all times.

This is arguably the trickiest aspect of germination. You have to strike a balance between ‘warm’ and ‘hot.’ Spring temperatures are ideal in a ‘normal’ year. While cannabis seeds can germinate in colder weather, the process takes longer. Seedlings also germinate faster when there is plenty of humidity in the air. If you are concerned about low temperatures, invest in incandescent bulbs, and place them over the seed area.

First and foremost, seeds perform at their best when they are left alone! When you check them for the taproot, handle with care! Try to avoid touching the white taproot because it can easily break off.

Planting

You don’t have to plant germinated seeds too deep in the soil, or whatever growing medium you choose. 0.5” – 1” below the surface is plenty. Point the white root downwards into the earth to ensure the seedling is ideally oriented.

Are Your Seeds Good or Bad?

Always opt for dark cannabis seeds as they are the most likely to germinate when kept in the right conditions. White or pale-green seeds have little or no chance of growing.

You may have heard the age-old advice on checking for viable seeds. Apparently, if you can crush seeds between your fingers, they are ‘bad.’ First of all, they won’t be good seeds because you have destroyed them! Secondly, experienced growers know that even flimsy seeds can germinate when exposed to the right conditions.

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How to Germinate Marijuana Seeds – 5 Methods

1 – The Paper Towel Method

This is the easiest method and requires cannabis seeds, paper towels, and two clean plates. A word of advice: Choose cheap paper towels because they are non-porous. As a result, you can lay seeds and roots on the surface and not worry about them getting stuck. If you use high-quality paper towels, the roots will grow into them!

It is a simple method, but also a risky one. You could damage the taproot while moving the sprouted seeds, or else the paper could dry out and kill the seeds. In any case, here is the process:

  1. Use up to four sheets of paper towel and soak them in distilled water. While you must soak the sheet, make sure there is no water dripping off.
  2. Place two of the paper sheets on one of the plates. Lay the seeds down at least 1” away from one another. Cover with the other two layers of paper towel.
  3. Cover the seeds with the second plate to lock in moisture. You have created a low-cost dome! Make sure you check the seeds often to see if they have sprouted.
  4. Keep the seeds in a room where the temperature is between 70- and 90-degrees Fahrenheit.
  5. Now you must wait! Seeds typically sprout within 1-4 days, although older seeds often take up to a week.
  6. When checking the seeds, make sure the sheets are saturated. If they are drying out, add more water.

You will know that germination has occurred because the seed will split, and a little root appears. Make sure you don’t touch the taproot when it sprouts or during the transplantation process.

EDITOR’S CHOICE – Homegrown CannabisCo

Homegrown CannabisCo are the masters when it comes to seeds. Offering a massive variety of cannabis seeds that are well categorized, not only does this company create a resource for superb quality options including feminized seeds, it also provides extensive growing information for those looking for some support along their journey.

2 – Direct Planting

In nature, a marijuana seed will germinate in the soil and emerge with its taproot growing into the earth. Therefore, you can plant cannabis seeds straight into your growing medium of choice. The main benefit here is that you don’t have to worry about ‘shocking’ the seedling while transporting it.

Your seedling should instantly adjust to the new environment and grow. When using this method, dig a hole 0.5” – 1” deep in soil that is moist but not saturated. Keep things warm with a heating pad or lighting.

3 – Starter Cubes and Seedling Plugs

This has been championed as the easiest germination method. It is effectively a foolproof method. All you have to do is place the seed into the cube/plug and add water. Assuming you put the seeds in a room with the right temperature, germination should occur automatically within a few days. There is a pre-made hole for the seeds, so it is a ‘set it and forget it’ method.

The main downside with this germination method is that such plugs are generally available in packs of 50. Waste is inevitable if you only plan on planting a few cannabis seeds. The plugs dry out in a week or so and become unusable.

You can also use Rockwool cubes as they are cheap and easy to find. However, they are a terrible burden on the environment and bad for your health. Rockwool also has a high pH (which means you must rinse the cubes first) and offers a low cloning and germination success rate.

4 – Overnight Soaking

This is as simple as option #3. It involves nothing more than placing the seeds in a glass of lukewarm water overnight. It is a good idea if you’re using old and hard seeds. The soaking process can breathe new life into them. When you place the seeds in water, they float for a few hours before sinking to the bottom.

The soaking process can breathe new life into old seeds.

If you use a transparent container such as glass, you get to see the white taproot break out! You shouldn’t leave seeds soaking in water for more than 32 hours. Otherwise, seeds that haven’t sprouted yet will drown. If the seeds haven’t germinated by the 32-hour mark, put them in a warm and moist place to complete the process. You should probably use the paper towel method at this point.

5 – A Germination Station

You can purchase a readymade version online. Alternatively, attempt a DIY station by placing a plastic dome over a plate that you then add to a heating pad. Professionally made stations are relatively inexpensive and work rather well. You can buy one for under $40, and their plastic tops ensure better humidity control. With top brands, all you have to do is choose your growing media and plugs to start growing.

Transplanting Germinated Cannabis Seeds

There is no room for a delay once your cannabis seeds have begun to sprout. Now is the time to transfer the seed to its growing medium. Most growers prefer to use small pots, to begin with. Make sure you fill enough pots with loose potting soil and use a pencil to poke a hole around 0.25” deep. Remember, you could break the taproot very easily. Transfer it using tweezers and drop the seed into the hole with the root facing down. Finally, cover it with a thin layer of soil.

For the first few days, use a spray bottle to water the seeds, because adding too much water can drown them. It is worth investing in a pH meter to test the soil regularly and make sure it has enough moisture. If all goes well, the seed should sprout from the earth within a week. If it hasn’t sprouted within ten days, it will probably die.

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Turn on your grow light once you have planted the seeds. The heat improves germination rates and speeds up the process of the seedlings opening their first set of leaves. These leaves will remain yellow until exposed to a sufficient level of light in any case. When you plant multiple seeds, you will find that they grow at different rates.

Inevitably, some will fail, while others will flourish. You will have seeds that pop fast and proliferate. Don’t be disappointed if you have a few failures because that’s part and parcel of the growing process. Even when you get everything right, you will inevitably lose a few seeds, and it won’t be your fault!

EDITOR’S CHOICE – Homegrown CannabisCo

Homegrown CannabisCo are the masters when it comes to seeds. Offering a massive variety of cannabis seeds that are well categorized, not only does this company create a resource for superb quality options including feminized seeds, it also provides extensive growing information for those looking for some support along their journey.

Jorge’s Cannabis Encyclopedia: Seed Germination

Cannabis seeds need only water, heat, and air to break dormancy and germinate; they do not need extra hormones, fertilizers, or additives. Seeds sprout without light in a range of temperatures. Strong, viable, properly nurtured seeds germinate in 2 to 7 days. At germination, the outside protective shell of the seed splits, and a tiny, white sprout (radicle) pops out. This sprout is the root, or taproot. Cotyledon, or seed, leaves emerge on a stem from within the shell as they push upward in search of light.

Break dormancy: Put newly harvested seeds in the refrigerator for a week or two to simulate winter. Remove and germinate. Seeds will germinate more uniformly because they all come out of dormancy at the same time.

Timeline for Germinating Most Seeds:

At 36 to 96 hours – Water is absorbed, root tip (radicle) pops through outer shell and is visible.
At 10 to 14 days – First roots and root hairs become visible.
At 21 to 30 days – At least half of seeds are rooted by day 21. Seeds not rooted by day 30 will probably grow slowly.

Once seeds are rooted, cell growth accelerates; stem, foliage, and roots develop quickly. Seedlings develop into full vegetative growth within 4 to 6 weeks of germination.

Seeds are Prompted to Germinate By:

water
temperature
air (oxygen)

Water: Soaking seeds in water allows moisture to penetrate the protective seed shell within minutes. Once inside, moisture continues to wick in to activate the dominant hormones. In a few days, hormones activate and send enough signals to pro- duce an initial root tip. The white radicle (rootlet) emerges to bring a new plant into the world. Once a seed is moist, it must receive a constant flow of moisture to transport nutrients, hormones, and water so that it can carry on life processes. Some seeds need lots of moisture to wash out the dormancy hormones in the seed coat, and if they do not get enough moisture, they do not germinate. Conversely, too much water deprives the seed of oxygen, reducing its quality or destroying it. If fragile germinated seeds are allowed to suffer moisture stress now, seedling growth will be stunted. Soaking most seeds in water for 12 to 24 hours is all they need to initiate germination. All the nourishment for a seed’s initial growth requirement is pulled from the fleshy cotyledons, or seed leaves. Water seedlings with low-EC (electrical conductivity) household tap water during the first week or two of life. Supple- mental nutrients are unnecessary and if applied in excess can disrupt internal seed chemistry. Some gardeners prefer to germinate seeds using distilled or purified water that contains virtually no dissolved solids.

Temperature: Overall, cannabis seeds germinate in temperatures from 70°F–90°F (21°C–32°C) and grow best at 78°F (26°C). Temperatures below 70°F (21°C) and above 90°F (32°C) impair germination. Low temperatures delay germination. High temperatures upset seed chemistry causing poor germination. Seeds germinate best under the native conditions and temperature ranges where they were grown.

Air & Oxygen: Sow seeds twice as deep as the width of the seed. For example, 0.125-inch (3 mm) seeds should be planted 0.25 inches (6 mm) deep. Adequate oxygen is un- available for seeds planted too deeply, and tender seedlings have insufficient stored energy to drive through deep layers of soil or crusty hard soil when sprouting.

Agricultural Astrology — Planting by the Moon

Ancient Babylonians and Egyptians planted and harvested based on moon phases in relation to geographic location. The premise is that plants grow better when planted during the appropriate moon phase.

Moon phases cause ocean tides to rise and fall. They also affect the rise and fall of moisture in soil and fluids inside plants. The moon phase influence is said to be the same indoors, outdoors, and in greenhouse-grown cannabis.

Cannabis gardeners who plant by the moon report faster-sprouting seeds that grow into vigorous plants. However, scientific evidence is lacking in regard to cannabis and other plants’ relationship with agricultural astrology.

Seeds need oxygen from the air to germinate. Growing mediums that are too moist (soggy) will cut off oxygen supplies and the seeds will literally drown. Cannabis seeds germinate best when moisture is between 60 and 70 percent.