Here’s how to germinate marijuana seeds the easy way with the most success and less hassle. SSSC’s Cannabis Seeds Germination Guide: In this article we will try and give you an overview over the different germination methods used for cannabis seeds and then tell you our preferred way of Everything there is to know about growing marijuana seeds in rockwool cubes and where found it > Read the article! | SensorySeeds
How to Germinate Marijuana Seeds the Easy Way
There are many opinions about how to germinate marijuana seeds.
Some people advocate putting cannabis seeds in between two wet paper towels.
Others say put them in a glass of water.
Such methods force you to handle your seeds when they’ve just sprouted.
The seeds have to be carefully plucked from the paper towels or water, and just as carefully placed into a growing media.
The extra handling creates opportunities for germinated seeds to be damaged.
The simplest methods that work well are always the best methods.
That’s why I germinate marijuana seeds in the media they’ll grow in.
If the final destination for my seedlings is soil, soilless mix, or coco coir, I put the appropriate material in a JiffyPot and water them from the bottom with reverse osmosis water at 6.1 pH.
You may notice it’s impossible to get accurate pH readings on zero parts per million reverse osmosis water.
I add beneficial microbes such as Voodoo Juice, Piranha, and Tarantula until I get enough parts per million to make my pH readings accurate.
The added benefit of using beneficial microbes products is they protect cannabis roots and root zones, and speed up root development.
If the final destination for my marijuana seedlings is a pure hydroponics system such as deep water culture or an ebb and flow hydro system using rockwool, I plant my seeds into a rockwool cube.
Not the smallest size ones either. I like the larger sizes.
Look here for detailed information that helps you germinate marijuana seeds using rockwool cubes.
Note that rockwool must be pre-treated before use to get its pH where you want it.
Look here for instructions on how to condition rockwool.
The best depth for planting marijuana seed is 3/8 th to ½ inch below the surface line.
The best temperature range to germinate marijuana seeds is 74-76°F, but they can germinate up to 80°F. Warmer than that is too warm.
If you don’t have precision temperature control where your seeds are germinating and temps are too cool, you could use a seedling heat mat.
Be careful to control the seed zone temperature when using a seedling heat mat.
It’s best to get a seedling heat mat with built-in thermostat.
Don’t Drown Your Cannabis Seeds
The biggest mistake growers make when they germinate marijuana seeds is overwatering.
The rockwool cube, soil, soilless mix, or coco that you germinate marijuana seeds in shouldn’t be soaking wet.
The media should be totally damp, but not soaking wet.
If the media is too wet, seeds might rot or drown.
If you have healthy seeds, they should germinate in 2-5 days.
Old or inferior seeds can take as long as 10-11 days.
If they’ve been moist that long and haven’t germinated, they’re most likely not going to.
If your seeds are old or otherwise not fresh or reliable, look at this kit that can help them germinate.
As soon as your seeds germinate, put them under a Hortilux PowerVeg lighting fixture, or some other T-5 or low-power LED, for at least 2-3 weeks until you’re sure your seedlings’ root systems and leaf structures can handle full HID, LED, or sunlight.
Rather than using the paper towel or submerse in water methods, this method we’ve given you to germinate marijuana seeds is direct, easy, and doesn’t require you to handle, transplant, and possibly damage a sprouted marijuana seed.
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SSSC’s Cannabis Seeds Germination Guide:
In this article we will try and give you an overview over the different germination methods used for cannabis seeds and then tell you our preferred way of starting SSSC-seeds. In general cannabis seeds germinate best at a warm temperature of around 21-26 degrees Celsius.
We have personally tested all the described methods in a side-by-side germination test already years ago and found them to be almost equally effective, if done correctly.
It strongly depends on the growers personal preferences (e.g. organic-grower, soil-grower, hydro-grower etc.), which method of germination is best suited for him individually. Somebody who wants to grow purely organic, will not want to use rockwool-plugs as starting media out of principle. A hydro-grower on the other hand will not want to start the seeds directly in soil, when he later continues his grow on rockwool-cubes.
The best way to germinate cannabis seeds:
a) directly in soil
b) in rockwool cubes
c) on wet paper towel
a) Germination directly in soil:
In nature a seed will start its germination on or in the ground as soon as it comes in contact with enough water. The water will permeate into the seed-shell and start the germination process inside, the small plant-embryo inside the seed will then start to grow. If it stays wet enough and does not dry out during the germination process, the plant will grow into a small seedling. As growers we want to re-create this natural process.
Therefore, the first thing to do is putting the seeds into a small glass of water and let them soak there for 24 hours.
There is special planting soil for seedlings (which is not fertilized) you can buy at any gardening shop, or you can simply use a light-mix (=soil with perlite) for cannabis (which is only slightly fertilized).
It is very important to put the seed NOT too deep into the soil when you plant it! The deeper you put it into the soil, the more the seedling has to fight to reach the surface.
The maximum depth a seed should be buried is about two times its own diameter, therefore with a cannabis seed that is about 5 mm deep!
The seed is planted with the TIP OF THE SEED POINTING DOWNWARDS into a small hole in the center of the pot and then covered with soil.
The WHITE TAP-ROOT that will grow out of the seed, WILL ALWAYS GROW OUT OF THE TIP OF SEED and then search its way downwards into the soil. Therefore it is important to put the seed into the soil in the correct position, this will ensure that your roots don’t get tangled and your plant can develop quickly.
The small pots are put under a grow-lamp (e.g. T5, LED, HPS, MH) and after 24 to 48 hours in the soil the stem of the seedling should start to show and poke out of the soil. The first set of round leaves, the so called cotyledons, will open up and the seedling can start photosynthesis and start growing.
b) Germination on rockwool cubes:
Rockwool Cubes are especially designed and produced as a sterile growing medium for plants and come in different standard sizes for easy re-planting. The smallest cube-size (25-36 mm side-length) is used for the germination of seeds.
First the rockwool cubes MUST BE soaked in ph-adjusted water (ph=5,5) for 2 hours in order to get their ph-value to 6,0 (they are ALWAYS produced with a ph-value of 7,5, which is much too high for cannabis and MUST be neutralized first!) and then the excess water is drained.
Now the rockwool cubes are ready for use. They can be either be soaked again, this time in a mild nutrient solution (EC=0,3) with a ph of 6,0 or used directly.
The rockwool cubes are put into special trays, which hold 77 to 125 little cubes.
Each cube has a tiny hole on the top, which is made to hold the seed.
The seed is carefully (with a pincet) put into the tiny hole with THE TIP POINTING DOWNWARDS, in order to make sure the root grows downwards.
The tray holding the rockwool-cubes has to stay moist at all times during the germination process.
Now it takes appr. 48-72 hours under a grow-light for the seedling to appear and grow out of the top of the rockwool cube.
c) Germination on wet paper towels:
As alternative to starting your seeds inside the growing-medium (e.g. soil-, peat, rockwool) you can pre-germinate them on wet paper towels and let the white tap-root grow out of the seed-shell before you transplant the seeds into your preferred growing medium.
The seeds are put on one half of a wet paper towel, which is then folded over to cover the seeds from both sides. After all air-bubbles are carefully pressed out of the folded wet paper-towel and insuring that the seeds are completely encased inside, the paper-towel is put inside a zip-loc plastic baggy. The bag is closed and then hung up at a dark place (e.g taped to the inside of a closet-door). By hanging the seeds inside the bag instead of laying them on a plate, you ensure that the white tap-root can grow out of the seed-shell STRAIGHT and does not curl up in a circle. This will later enable you to transplant the germinated seed easier into the growing medium. After 48-72 hours inside the plastic bag and encased by the wet paper-towel the seeds will have opened up and the white tap-root should have grown out of the seedling for about 5-10 mm. Now they can be taken off the wet paper-towel with a pincet (VERY CAREFULLY without hurting the fragile white tap-root!) and planted into the growing medium with the WHITE ROOT POINTING DOWNWARDS! Since the seed has started its germination already, it does not need to be buried deep. The best way is to put it into a small hole in the soil with the seed-shell still peaking out of the soil a little bit. This way it can start to grow upwards right away and you will have a tiny plant already 24 hours after transplanting the pre-germinated seed into the soil and putting it under a grow-lamp.
Here at the SSSC we prefer to grow organic (see Karel’s ‚Bio Grow-Book‘) and therefore we prefer to germinate in soil.
Here is our little step-by-step guide to germination success in soil:
1.) Soak the seeds for 24 hours in a small glass with distilled water
2.) Fill a small pot with potting soil or light-mix
3.) Water the soil well with ph-neutral (ph=6,0) water, but make it not too wet (not soggy!)
4.) Make a small hole in the center of your pot
5.) The hole should be appr. 5 mm deep and wide (e.g. you can use your small finger)
6.) Place the seed in the center of the hole with the TIP OF THE SEED POINTING DOWNWARDS!
7.) Cover the hole with soil and carefully push the soil from all sides inwards to make sure the seed is well enclosed inside the soil
8.) Push down and compress the soil at the outside, directly at the walls of the pot, in order to make a little ring around the whole pot. This ring is for drainage while watering. It makes sure the seed does not get flushed out of the soil at the beginning and later prevents the stem from standing in water and starting to rot.
9.) Water the little pot from time to time, by pouring a little water into the ring on the outside, before the soil gets too dry. The water will be sucked towards the center of the soil right away. Try to avoid pouring water directly into the center of the pot, in order to avoid flushing out the seed per accident!
We hope you find the germination method that fits best to your growing style and wish you lots of success with your SSSC-seeds!
Where to find marijuana seeds ideal for growing in rock-wool?
Here is how rockwool is used in the cultivation of hemp
Many cannabis lovers wonder where to find ideal cannabis seeds for rock-wool cultivation: but are you sure you want to grow marijuana seeds in rockwool cubes? Before you do, there are a few things you should know.
PSYCHO XXL AUTOMIX
First of all, growing cannabis in Italy is illegal: the hemp plant produces inflorescences containing THC, the active ingredient of marijuana, which is illegal in percentages above 0.5%. For this reason, the cultivation of hemp is prohibited, even if it is no longer a criminal offence in case of small cultivation for personal use: what is legal is instead to sell and buy cannabis seeds. But what is the reason?
You should know that weed seeds do not contain THC in themselves and an inactive state is therefore considered in the same way as the common seeds of other types of plants.
The legal problem arises when they are germinated, as they would give birth to a hemp plant that would produce flowers with a high THC content.
So, if you are wondering where to buy marijuana seeds, the answer is in a grow shop, physical or online, such as SensorySeeds, and if you want to germinate them, you take a significant risk. Theoretically, the uses of marijuana seeds in Italy are as follows:
The use of stone wool as a substrate for the cultivation of hemp is a very particular technique and has, like all the others, pros and cons. Let’s see what it consists of and what are the advantages and disadvantages of growing cannabis seeds in rock-wool.
Growing cannabis seeds in rockwool: what is it and what are the advantages and disadvantages of using it
You’ve probably already heard of rock-wool but didn’t know it was also used to grow cannabis seeds and it wouldn’t be so strange if you didn’t have the slightest idea what it is. Rockwool cubes are, contrary to popular belief, an artificial product, created by man to imitate a typically Hawaiian natural phenomenon.
Pele’s hair is basaltic glass filaments born from the volcanic eruption of Kilauea, in the Hawaii islands. Due to the strong wind, the lava solidifies into a filamentous form that resembles blond hair, just like that of the god Pele. Artificially, therefore, this natural process is reproduced, solidifying basalt slag in filamentous form, using air flows, to obtain rock wool cubes.
The advantage of this type of substrate for the cultivation of cannabis seeds is linked to its humidity gradient, capable of retaining and distributing all the nutrients nebulised on it homogeneously. However, rock-wool tends to dry quickly on the surface, remaining more humid on the ground, so it should be continuously monitored.
Another great advantage of rock-wool cubes for growing marijuana seeds is that they can be placed in larger cubes as the plant grows, without disturbing its roots in any way. It will avoid having to move the cannabis seedlings from one pot to another, protecting their good health.
This type of substrate is very often used in professional hydroponic marijuana crops because of the absorbing power of its filaments. However, if it goes well in professional hydroponic systems, it presents risks in the management of home growing, which is legal in some municipalities of Spain.
The absorbing power of the filaments is a double-edged sword: if poorly handled it can lead to overloading of liquids underneath or excessive dryness since in a few hours they tend to slip away. If used outside of a hydroponic system, rockwool should be followed very carefully from this point of view, both to prevent it from staying dry for too long and not to have an overload of nutrients in the plant.
Now let’s see what the main steps are for growing ganja seeds in rock-wool.
Growing cannabis seeds in rockwool – that’s how to do it
As said before, growing weed seeds is not legal in our country, as they would lead to the production of high THC flowers. However, there have been cases where the law allows the home growing of marijuana for personal use, as it happens in some cities in Spain.
If you were to choose to grow marijuana seeds in rockwool cubes, you would first need to know how to handle this type of substrate. While it has a high absorbency power, it also has a rapid “slip” of liquids underneath, which you should keep under control to avoid nasty surprises.
First of all, you should know that rockwool has an average pH of 7, which is too alkaline to grow cannabis seeds, so it needs to be treated before using it. What you need to do is to soak the rock-wool cube in a nutrient solution with pH at 4.5 and CE (electrical conductivity) at 0.4-0.5, to stabilise the PH of the cube properly.
To be sure that you have obtained the appropriate value for growing marijuana seeds, the cube must be soaked in a nutrient solution with pH 5.5 and the PH of the runoff from the filaments measured: if it remains the same, it is ready. On the contrary, if it is still too high, it will be useful to re-immerse it in the first solution for a few hours and then redo the test until the desired PH is reached.
Once this is done, you can finally place the cannabis seed in the rockwool cube, after having previously soaked it in warm water or moistened it in the previous 24 hours using absorbent paper, all strictly in the dark. Once activated, in a few days the maria seed will hatch and the first cannabis bud will be born, which will soon open its cotyledons, the first two round leaves, and will harpoon its rootlets to the filaments of the cube.
As soon as the seed is placed in the rock-wool, it will be useful to keep it at a constant temperature of 20°-25°, which can be obtained if necessary, with a suitable lamp, lit above the cube. Maintaining humidity is very important, so unless you have created an automatic hydroponic system, you will often need to check the level of impregnation of the stone wool cube.
Once well rooted, the hemp seed can be relocated, without having to extract it from the first one, in a larger rockwool cube, previously treated as we have seen before. At this point, the hemp seedlings will be ready to be exposed to artificial light in a cultivation room.
Where to buy cannabis seeds suitable for growing in stone wool?
As you have read in this article, growing cannabis seeds in stone wool has its pros and cons. Its use is certainly more suitable for professional crops. Still, there is nothing to prevent it from being used at home, in countries where the cultivation of marijuana seeds is allowed, with adequate attention.
If you are wondering where to find marijuana seeds suitable for this type of cultivation, the answer is SensorySeeds, our online cannabis seed shop. Inside you’ll find lots of weed seeds BSF, from feminized seeds to auto flower seeds, as well as fast flowering seeds.
You’ll be spoilt for choice, and you’ll be able to receive the best cannabis seeds directly to your home in a few days and in totally anonymous packaging to preserve your privacy.
So, what are you waiting for? Click here and enter SensorySeeds, the online shop with the best cannabis seeds on the market!