Seed questions

This section of our FAQ will try to answer all questions you might have about cannabis seeds sold on this website. Click any of the questions below to view the answer.

What is the best way to germinate seeds?

For the first step, you'll need two saucers or plates and some moist tissue.

  1. Line the bottom of the first plate with a few layers of wet tissue and drain any excess water from the plate.
  2. Next, place your seeds on top of the tissue, allowing each seed as much space as possible.
  3. Place another few layers of moist tissue on top of the seeds, again allowing excess water to drain off.
  4. Lastly, cover everything with the second plate, upside down, to form a 'clam-shell' shape - this will create the dark, moist environment necessary for germination.
  5. Place the plates somewhere warm (21ºC) and away from direct light.

Your seeds are now on their way to germination. What you need to do now is:
  1. Check your seeds every day to ensure that the tissue does not dry out. Spray the tissues with water if necessary.
  2. Within a few days you should see the first seeds open and a root emerge. It is uncommon, but some seeds may take up to 10 days or even two weeks to open.
  3. When the first few millimeters of root have emerged from an open seed, you should then CAREFULLY (preferably with tweezers) transfer it to a small container of growing medium (soil or rockwool). Make a hole 2-3mm (max 5mm) deep in the medium, place your seed, root first, into the hole and cover over.
  4. Your seedling should emerge from the medium within 1 to 3 days.

What is the difference between indica and sativa?

Scientifically (and legally), all cannabis is Cannabis Sativa L..
In practice, Indica and Sativa are the names used to distinguish each end of the cannabis ´spectrum´. There are a multitude of different growth-patterns, qualities and effects within this spectrum, most of which are a result of cannabis' remarkable ability to adapt to its environment. Genetically, and in terms of interbreeding, all cannabis is in the same family.


  • Most Indica varieties come from southern Asia and the Indian subcontinent (Afghanistan, Pakistan, India, Tibet, Nepal, etc.).
  • Indicas are compact and stocky, with dense, heavy, fragrant buds. Indica buds tend to grow in clusters, with varying amounts of space (known as 'internode space') between each cluster.
  • Indicas are the faster flowering varieties, usually with a flowering time of 6 to 9 weeks.
  • Indicas do not tend to gain height rapidly once flowering has begun. An Indica may be expected to gain between 50 and 100% of its vegetative height by the end of its flowering period.
  • The effect of Indica is generally classified as a 'stone', meaning that it is more centred on the body. It may enhance physical sensations such as taste, touch and sound. It has a relaxing effect - mentally and physically - and may be soporific in larger doses.


  • Sativas generally originate in the equatorial regions - Thailand, Cambodia, Jamaica, Mexico, etc.
  • Given the same conditions, Sativas grow taller than Indicas. Sativa buds tend grow larger than Indica, as they run along the length of a branch instead of clustering around the internodes. However, they will usually weigh less than Indica when dry, due to their lower density. Sativa buds also tend to have a less striking odour, both when growing and when dry.
  • Sativas take longer to flower. They will usually need between 9 and 12 weeks to finish blooming. However, they need far less vegetative time BEFORE flowering than Indicas. So the overall time required for Sativas is about the same as for Indicas (and sometimes less in terms of 'light hours')
  • Sativas will usually continue to gain height while flowering, often gaining 200%, 300% or more of their vegetative height while flowering. This is because around the equator there is not so much difference in the number of daylight hours between winter and summer. Therefore, Sativas in their native environment will grow and flower at the same time. For this reason indoor growers should not allow a Sativa too much vegetative growth before inducing flowering. When growing from clones, many Sativa varieties may be flowered as soon as the clone has rooted.
  • Despite their lower weight and potentially longer flowering time, Sativas are valued by many growers for their 'high' effect. This high may be characterized as cerebral, energetic, creative, giggly or even psychedelic. It is less overpowering than the Indica 'stone', and less likely to send the user to sleep.

Growing Questions

For legal reasons we cannot discuss any questions related to growing on this website. Instead we would like to direct you to the Sensi Seeds Forum. Below you will find of the most popular pages.

What is the germination rate of your seeds?

We regularly test the germination rates of all the cannabis seeds sold on our website. Most of the time, 90 to 100% of tested seeds germinate. If a line of seeds displays a below-standard germination rate (75%), that line is removed and replaced.

However, since all cannabis seeds are living material, we cannot offer guarantees on germination rates. We can assure you that all our seeds are viable as well as correctly stored and handled while untill shipment, but post point-of-sale there are too many factors that are beyond our control.

How are the seeds packaged?

Most of the seeds sold on this website are securely packed in a sealed blister pack.
[photos blister verpakking]

On top of that every order is packed in a sturdy padded brown paper envelope that will protect your seeds during shipment.

This unobtrusive protective packaging assures both the quality of the products inside and the privacy of our customers.

As you can see in the image below, there are no company logos or advertising on the envelope and we guarantee our customers that there will be absolutely no reference to cannabis or related subjects on the exterior of our packaging.

[plaatje met verpakking]

You are a 100% guaranteed that nobody will be able to see what is inside unless they break the seal and open the package.

What is the best way to store seeds?

Seeds should always be kept dry, cool (close to 4º C if possible) and dark. The refrigerator (NOT the freezer) is a good place to store seeds, preferably inside a film canister, to avoid light and moisture condensation.

In the absence of a fridge, the back of a closet is OK, as long as your seeds are not exposed to moisture, heat or excesses of light.

What are feminized cannabis seeds?

Feminized seeds are essentially cannabis seeds that produce only genetically female plants.

Genetically, a cannabis plant is more or less predisposed to become male or female. This is regulated by 2 chromosomes everyone knows as the X and Y chromosomes. A plant with 2 XX chromosomes becomes female. A plant with an X and Y turns into a male.

Feminized seeds are created by forcing a female plant to produce male flowers by treating it with Gibberellic Acid. This effectively makes the female plant into a hermaphrodite and makes it possible to produce seeds that have only XX or female chromosomes.

Before these seeds can be marketed as feminized seeds they need years of testing and an elaborate multi-stage breeding programme to make sure the plants they produce are absolutely stable and consistent.

Will all plants grown from feminized cannabis seeds be female?

All plants grown from the feminized strains sold on this website will be genetically female.

An argument that is often heard in regards to feminized seeds is the problem of hermaphrodites. This is something that might have happened in the early days of feminized seeds but nowadays this is a very rare occurrence. All feminized seeds sold on this website are as stable as regular cannabis seeds.

New techniques in the feminizing process and an intensive, multi-stage breeding programme made sure that present day feminized seeds are 100 percent stable, consistent and productive.

How long do seeds last?

Stored correctly, most seeds should have a lifespan of at least two years. This is certainly not to say that after two years all your seeds will be dead, but beyond the two-year mark, their germination rate will begin to decline.

What are the best conditions for seedlings?

Seedlings will benefit from a bright (though not, initially, under lamps or in direct sunlight), warm (21ºC) and humid environment. A propagator is the easiest way to achieve these conditions. A propagator may be bought or built. It is, basically, a box with a transparent top which allows light in but stops humidity escaping. The simplest form of propagator would be a waterproof box with clear plastic sheeting over the top. The advantage of shop-bought propagators is that they often have built-in heating and/or vents in the cover to allow humidity regulation. They also usually allow more light to reach the seedlings.

Place your propagator next to a window to give the seedlings light, but avoid direct sunlight for the first couple of weeks.

When can seedlings be put outside / under lights?

When seedlings have grown their second or third set of serrated leaves (not counting the round cotyledons that initially emerge from the seed) they are usually hardy enough to flourish in direct sunlight or beneath a grow-lamp (preferably metal halide or fluorescent tubes). Always keep your grow-lights at least 50cm from your seedlings.