Germinating Weed Seeds In Rapid Rooters

How to Germinate Marijuana Seeds: 4 Different Methods Plus Expert Tips I don't have good luck with germinating seeds or keeping them alive long enough to grow out. Most of my failures have come in the first two weeks so I am… Weed seeds germination can be easy and fun. Learn how to successfully grow your own cannabis plant with our step by step guide.

How to Germinate Marijuana Seeds: 4 Methods Plus Expert Tips

How to Germinate Marijuana Seeds Method 1: Starter Cubes & Seedling Plugs (Recommended)

One of the best cannabis germination methods is to use specifically-made starter cubes and seedling plugs. These plugs make cannabis germination easy. You simply place the seed in the cube or plug, add water as directed, and seedlings automatically get the perfect conditions for germination.

Each cube or plug already has a hole specifically for you to place your seed. Just stick your seed into the precut hole and pinch the top closed a bit with your fingers. Don’t worry, you can’t mess this part up As long as the seed makes it in there, you should be good.

This is one of the easiest germination methods, and doesn’t leave a lot of room for error. Cannabis seeds and clones can be expensive, and sometimes we have genetics we just can’t afford to lose. When that’s the case, germinate your cannabis with one of the following recommended options to ensure as close to 100% germination rate as possible.

Which Starter Cubes Work Best for Germinating Cannabis?

Rapid Rooters (Highly Recommended For All Setups)

Rapid Rooters are easy to work with – you just stick your cannabis seed in the Rapid Rooter (pointy side down), keep your seed warm and slightly moist, and let the Rapid Rooter do its magic.

Sprouts emerge and roots appear in just a few days.

Rapid rooter starter cubes are suitable for all growing methods, including hydroponics, coco coir and soil. They work for every setup and come from General Hydroponics, a trusted company (the same one used by NASA) which is known for the quality and consistency of its products.

I highly recommend using Rapid Rooters over any other starter plugs. They are less prone to problems and work great with any growing medium (including hydroponic systems).

  • Easy to Use – You Can’t Really Mess Up
  • No Prep or Setup – Open the Package and Go
  • Some of the Best Germination Rates of Any Method
  • Can only get 50+ at a time (General Hydroponics currently does not offer fewer plugs per package)
  • After opening the package, you only have a week or two before they dry out, so if you’re only germinating one or two seeds, you’ll end up having to throw many of the Rapid Rooters away.

There are a few different options for Rapid Rooters, which can be confusing if you’re not sure what you want. The 3 different options for Rapid Rooters are listed here…

Bag of Rapid Rooters

These are round on bottom instead of being a cube, which means they cannot stand up on their own. These are best suited to a hydroponic setup where the Rapid Rooter will be placed directly in the final destination. In our hydroponic setups, we’ve had near 100% germination rates with Rapid Rooters, better than any other seedling cube we’ve tried.

  • Round on bottom (won’t stand up by themselves without support) unless you squish the bottom so it’s flat like this grower did (pic)
  • Great for starting with Rapid Rooter directly in final destination (hydro, soil, coco coir, etc)
  • Get 50 Rapid Rooters at a time
Rapid Rooters Mat
  • Easily break cubes off the mat (already sectioned off with precut holes)
  • Already shaped like cubes with flat bottoms, so they easily stand up by themselves
  • Good for seamlessly transplanting your seedlings somewhere else
  • Get 98 Rapid Rooters at a time
Rapid Rooters Tray

The Rapid Rooters tray is perfect for seeds or clones. Allow your young plants to sit in the tray with water until their roots are well formed and ready to be transplanted to your final destination. The standard size tray fits most humidity domes. You can refill the tray with Rapid Rooters from the bag or mat.

As you can see in the pictures below, the Rapid Rooter Tray comes packaged up. Once you open the package, you will see 50 Rapid Rooters already set in the tray. The resing place for each Rapid Rooter has a hole on the bottom so water within the tray is wicked up. The top part comes apart from the bottom.

  • Perfect for cloning or starting seeds with a humidity dome (standard 10-inch by 20-inch dome like this one – 7-inch height recommended for cannabis seeds or clones)
  • Easy to transplant to new destination
  • Just add water and seeds, that’s it!
  • Whole tray can be refilled with any type of Rapid Rooters (from bag or mat)
  • Comes with 50 Rapid Rooters, ready to go
Germination Station

One option for growers is to use a tool which has been specifically designed to provide optimal germination conditions like this germination station with heat mat.

You can make a DIY germination station at home by putting a plastic dome over a plate of Rapid Rooters on a heating pad.

There are benefits to the professionally made germination stations as they work very well and are pretty cheap to buy.

Rockwool Cubes (Not Recommended)

It’s often hydroponic cannabis growers who use rockwool cubes since these can be safely placed in hydroponic setups, hold a lot of moisture, and are resistant to mold. Rockwool is cheap and easy to find. It comes in convenient cubes. But it does have some major drawbacks…

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Pros of Rockwool

  • Cheap & Easy to Find
  • Inert Medium (useful for hydroponic growers)

Cons of Rockwool

  • Bad for the environment (unnatural material that does not break down)
  • Bad for your health (especially your lungs) – wear gloves and cover your mouth/eyes when handling rockwool
  • Has a pH that is too high for cannabis, so it must be thoroughly rinsed and treated
  • Poor cloning and germination rates
  • Difficult for new growers

Protect yourself! Always use a mask, goggles and gloves when working with rockwool.

If you do use rockwool, it’s recommended you germinate your seeds using another method like the paper towel method, then transplant your seeds to the rockwool cubes after roots have already appeared.

I highly recommend using Rapid Rooters instead for your hydroponic application (or any grow setup), as they are much more user-friendly and tend to get far better germination rates.

Jiffy Pellets

Jiffy Pellets are used in a similar way to rockwool cubes, though these tend to get much better germination results. Jiffy pellets are not suitable for most hydroponic setups where the roots are grown directly in water, but Jiffy Pellets can be directly transferred into soil or coco coir or soil.

  • Good Germination Rates for Soil and Coco Coir
  • Good for Cloning
  • Come in dried pellets, so they can be kept for a long time
  • Not suitable for hydroponic setups
  • Must be soaked to expand each pellet before use

Once the compressed Jiffy pellets have expanded in warm water, gently squeeze excess water from each pellet and you’re ready to go. Treat them the same as Rapid Rooters.

Next: How to Germinate Marijuana Seeds Method 2: Plant marijuana seeds directly in growing medium.

Starting seeds in Rapid Rooters?

I don’t have good luck with germinating seeds or keeping them alive long enough to grow out. Most of my failures have come in the first two weeks so I am modifying what I normally do in an attempt to get better results.

My new plan is to use rapid rooters and just place the seed in them, then place the RR in a seedling tray, put 1/4″ of water in the bottom of the tray, put on a humidity dome and put all of it in the dark.

The temp in my closest varies from about 80-85*F and the relative humidity is 66% without the humidity dome. The RH jumps to 85% RH with the dome on.

Is 85*f and 85% RH too high and could this cause fungus problems? Is 66% high enough given the fact they are sitting in a 1/4″ of water?

chuck estevez
Well-Known Member

I soak my seed in a glass for 12 hrs, drop into rooter,put little piece of rooter over hole. put nxt to window, at night, under cfl

Well-Known Member

Sounds like a recipe for cooking rotten seeds.

Don’t use a dome with seedlings, 66% is fine, so is 40. Seeds and seedlings do not require high air humidity level. And don’t put the rapid rooters in a layer of water. Instead add a layer of perlite or hydroton, put the rapid roots on those and water them. Try to keep the temp below 80.

I too soak seeds in (warm yet cooling down) water for 12-24 hours before planting them.

And place them under light.

Well-Known Member

And don’t put the rapid rooters in a layer of water. Instead add a layer of perlite or hydroton, put the rapid roots on those and water them.

That’s a brilliant idea! I will do just that.

I read two different versions. Some same put the RR in the dark to germinate and others say put them under light. Even the Rapid Rooter tray instructions say to place them in the dark to germinate.

Why is light so important when the seed is under cover anyway?

Well-Known Member

Even though your temps are 80-85f in the space the wet RR will be colder and it will likely fluctuate. Putting light (not too strong, I use T8 ) above it helps keeps the temps in the RR stable. But besides that, if you’re already have a hard time germinating, they will likely not all pop the same day and seedling that grow up in the dark become stretchy and lanky (searching for light) fast.

Soaking them addresses both of those issues. If germination fails from improper environmental settings it’s usually shortly before cracking open (too much water, not enough oxygen, and/or too cold/warm) or when it just cracked. The longer that takes, the riskier it gets and the more important it becomes that the environment remain stable. Ideally you measure the inside of the RR for a complete day.

Well-Known Member

Not only that but you can try for yourself an easy experiment. I had to do it for class but we did Pinto beans and did various hypothesis and tests. Anyway, one of the hypothesis I tested was light vs no light and they were in the same enviorment, one was just in a box without light. The roots were MUCH more developed on the beans in the light. this is them sitting in a moist paper towel inside of a plastic Baggie for 7 days. Soaking them vs unsoaked was also noticible but strangely light outside vs light inside didn’t have too much of a difference. and my outside temps were 90F~ while the inside was 75~

Well-Known Member

Not only that but you can try for yourself an easy experiment. I had to do it for class but we did Pinto beans and did various hypothesis and tests. Anyway, one of the hypothesis I tested was light vs no light and they were in the same enviorment, one was just in a box without light. The roots were MUCH more developed on the beans in the light. this is them sitting in a moist paper towel inside of a plastic Baggie for 7 days. Soaking them vs unsoaked was also noticible but strangely light outside vs light inside didn’t have too much of a difference. and my outside temps were 90F~ while the inside was 75~

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My first grow was a fist fight that I lost. I was smart enough to grow more seed than I needed and finally figured out what I needed to know enough to grow and harvest a few plants. I feel like if I can get my plants to live to two weeks old, I think I’ll have a good chance at finishing them.

I’m been trying to practice on bag seed and not having any luck germinating. I’ve order some expensive seeds and ready to try to germinate them but nervous they won’t germinate.

I’ve tried the paper towel method a couple of different ways and that bag seed didn’t crack. It could be just bad old seed but I’m not sure it’s not at least partially my method.

I’m thinking as soon as the seeds break the surface in the rooter, to plant them in a cup and move them to the tent under CFL’s at 12/12. The rooter won’t sit in the seedling tray for more than a day after they break the surface and won’t grow roots out of the rooter before they are moved.

First, I have to get them to germinate without growing fungus. Sativied’s idea of putting that rooter on top of a bit of perlite wicks the moisture up without saturating the rooter is a great idea. I am testing that right now to see what kind of moisture the rooter will hold and for how long while I wait for my seeds to arrive.

If you guys say put lights over the rapid rooters to germinate, I’ll do it, but it seems counter intuitive to me if seeds need dark to crack.

How to Germinate Weed Seeds: Three Easy Methods

People have been growing cannabis for more than 10.000 years, and the best thing about it is that it’s very adaptable to different environmental conditions.

Before we go over why that’s good and what you need to know about the process of growing marijuana, let’s familiarize you with some basic information.

Cannabis plants are divided into male and female counterparts and both of them produce flowers. Each sex has its own characteristics, and it is important to know them if you want to grow weed since they can affect the outcome of your plant’s growth.

The roots of this plant make a dense net, and they can go up to six feet in depth. When you look at the total mass of the plant, roots are only 10% of it, which means that they have low power of suction.

Female cannabis plants have stronger roots than male ones. It’s because male plants finish vegetation faster. Female plants keep adding nutrition to their seeds until they grow which means feminine seeds need more food and water to finish the process. That process makes their root system stronger.

First, Let’s Set Everything Up

Are you familiar with the term ‘germination’?

Germination is ‘’the process of seed starting to grow or the act of causing a seed to start growing.’’ So in essence, we’re trying to help kick start the growth process of your very own cannabis plant.

Before you start with your germination process, there are some things you need to prepare and learn first. Like any other plant, cannabis needs certain conditions in order to grow such as:

  • Temperature
  • Water
  • Light, etc.

Minimal germination temperature is 1°C – 2°C, while the optimum is around 30°C. Cannabis can grow in low temperatures too – as I said, they’re pretty adaptable. But still, you should do your best to maintain the optimum temperature if you want to be sure the germination process is successful.

This plant needs a lot of water, so make sure you have enough of it. Also, you need to be careful about lighting. If you lower sunlight, the plant will germinate faster, but it will be shorter and the leaves may change their shape.

Lastly, there are some technical things you need to be careful about. Hygiene is number one. It’s always important, of course, but especially if you want to plant cannabis seeds. So, take good care of your tools, your hands, the place where you plant it, etc.

If you’re a smoker, for instance, don’t even think about touching the plant if you don’t use antibacterial soap first. Nicotine can be poisonous to cannabis plants, don’t forget that.

There is one tip we can give you — always have rubbing alcohol by your side. So, whenever you want to cut, see or touch your plant, spray the alcohol on your hands, scissors, tweezers, etc. You can never be too careful!

How to Grow Weed Indoors for Beginners [Follow-Along Guide]

Germination With Paper Towels

One of the easiest methods is definitely this one, where you use paper towels. There are three things you’ll need: cannabis seeds – of course, paper towels, and clean plates. You don’t have to invest a lot, the cheapest paper towels will do a great job also.

Although this method is simple, it can be risky. You can easily damage the roots while you move the seeds, or the paper could lose its moisture, killing the seeds in the process. But if you are careful enough, everything should go according to plan.

Without further ado, let’s give you a quick step by step guide how to germinate weeds using paper towels:

  1. Soak the paper towels in water (preferably distilled). You should soak them well, but on the other hand, be careful that they aren’t dripping water.
  2. Take a plate and place two paper towels on it. Lay the seeds out (spaced well enough so that they aren’t close to one another), and then cover them with two other towels.
  3. Use another plate to cover everything. This way you ensure that the moisture is well locked in.
  4. Keep everything in the room at optimal temperature (30°C) and don’t forget to check the seeds to see whether they have sprouted. If you realize they are drying out, add a little bit of water.
  5. Be patient! This step is very important. Usually, the seeds will sprout within 24 hours to four days, but it can take up to a week.
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There you go! Your germination process in just five steps. No wonder this is considered to be so quick and easy.

Germination With A Glass of Water

This is the process that involves only one single glass and lukewarm water. Simple, right? Well, it definitely isn’t hard and it doesn’t require a lot of effort, but there is a higher chance that this method won’t be as successful as the first paper towel method.

First of all, the best seeds to use with this method are old and hard seeds. Place them in the glass overnight, but no longer than 32 hours.

When you place them in the glass, you’ll notice that the seeds will keep floating. Don’t worry, in a few hours, they will sink to the bottom. Our recommendation is to use transparent containers since that way you will be able to see the white tips of roots break out.

As we already mentioned, there is a possibility this method won’t work. If that happens, take out the seeds and lay them out in a warm place. After that, the best thing you can do is use the paper towel method to continue the germination process.

Hydroponic Weed Growing Guide: Grow Cannabis at Home (Step by Step)

Germination Using Medium

Cannabis is a plant that has grown on its own for centuries. Their seeds are sprouted in soil and they emerge as the roots start to grow down. That being said, germination in soil medium is the closest to their natural growth.

If you decide to go with this method, there is no need to worry about your seeds. There aren’t any chances to damage them while being transplanted. Usually, transplanting your seeds can cause damage since they have to adjust to their new surroundings. With this method, however, the seeds will start adjusting to the environment in no time.

The process is quite easy. Dig a hole (the size of a fingernail), and place the seed. Cover it and after that add a little bit of water to moisten the surface. Be careful about that, if you add too much water it could kill the seeds. Balance is key. We recommend you to buy a spray bottle when you want to add water to the plant to prevent overwatering the seeds.

There is one tricky part that you have to be careful about. If you want to go with this method, the humidity level in the room should be 50% – 70%, and you should always maintain it at that level.

You will have to wait for three to seven days to see results when using this method. After that, the seeds should start emerging.

Starter Cubes: The Easiest Germination Method

Germination using some type of growth medium is not hard, but it can be much easier thanks to starter cubes you can easily buy and use. There are different types, but they all have the same purpose — to make the process as easy and successful as possible.

They’re made out of a sponge-like material made of organic matter with nutrients and serve as a natural grow plug for seedlings. They’re user-friendly and you always get easy-to-follow instructions when you buy them.

They all work in the same way. Just place the seed in one of the cubes and add water. These cubes already have holes inside, which means that you don’t have to dig and that your seedlings get the best conditions possible for germination.

There are different types of starter cubes you should know about:

  • Rapid Rooters – Using these, you don’t need any preparation. Just take them out of the package and follow the instructions. Each package usually has enough plugs that can accommodate 50 seeds at a time. *(image from amazon)
  • Rapid Rooter Trays – These are basically rapid rooters that are made into cubes and packaged into a tray. They can stand on their own thanks to their flat bottom. *(image from amazon)
  • Rockwool Cubes – Also called Stonewool cubes, these are made of basalt and chalk spun into matter similar to cotton candy. Unlike rapid rooters, these cubes may not have holes, so you’ll have to dig them by yourself.

With any of the above starter cubes, there’s little chance for error. If you’re a beginner, we highly recommend you try starting out with them first. Once you gain experience, you can try out other methods.

To Conclude…

As you can see, you don’t need any special knowledge to germinate marijuana seeds. Arm yourself with patience, practice and good tools and the results will amaze you.

We encourage you to try one of these germination methods since they do not require a lot of effort and investment.