Complete Guide to Growing Weed From Seed

Our favorite part about beginning with a seed rather than a clone when growing your cannabis is that you get to watch the entire life cycle and enjoy a plant that is one-of-a-kind, just like you. An altogether new genetic composition will enter the world for the first time, and if you’re lucky, something spectacular may be born.

Growing a cannabis seedling, on the other hand, takes patience, delicate hands, and a dash of luck. Because pot seeds are endosperm seeds, which means they have practically pre-formed cotyledon leaves before you even add water, they are pretty robust. Here’s a quick rundown of the seed-starting approaches we’ve discovered to be the most effective. You are growing your seedling into a healthy and vigorous plant that can be transplanted.

1) Germinating Your Cannabis Seed

Soak your seed in lukewarm water for 12-24 hours, but no longer, then store it in a dark and warm spot (like a kitchen cupboard) to expedite germination. After being drenched, the seed absorbs the water thoroughly, kicking off the germination process on a physical and chemical level. This helps to loosen the shell by making it softer and more straightforward for the embryo to break open. When your seed drops to the bottom, it’s time to plant it, and it may even sprout a tiny taproot. Even if a seed does not sink or produce a taproot, it can still be planted. When a seed sprouts a taproot (also known as a tail), it becomes more fragile, thus it’s best to plant it before it sprouts.

2) Planting Your Weed Seed

Seedling pellets prepared from a blend of crushed peat moss and coco husk produce the greatest results. Soak it in water for 10 to 15 minutes to expand it. Using lukewarm water instead of cold water will shorten the time it takes for the pellet to fully inflate. Squeeze gently to eliminate extra water once your seedling pellet has absorbed enough water and developed to its maximum size. The growth media should have the consistency of a moist sponge, leaving no traces on the table. For your seed, dig a tiny hole approximately 1/4 inch deep. Remove the seed from its bath using a spoon. If a taproot has emerged, take careful not to destroy it. Place the seed into the hole with care. Cover it lightly with soil from the pellet. Within two weeks of starting the germination process, your seedling will emerge from the earth. The longer it takes for a seed to germinate, the older it is.

3) Weed Seedling Sprouts 

The most exciting stage of all, your plant baby will emerge from the earth in 1-2 weeks, with the average appearing 5 to 7 days after planting. It may take a few days for your seedling’s shell to break off as it emerges from the soil. It’s better to leave it alone; nature will take care of the rest. If it hasn’t emerged from the ground after two weeks, the chances of success are slim, and it’s better to try again. Even the finest seeds only germinate at about 85% of the time. When your seedling emerges from the earth, it will seek for direct sunlight.

4) Lighting for Your Cannabis Seedling

Marijuana seedlings need a reasonable quantity of light to grow—enough to acquire energy but not so much that they get scorched. If you leave your seedling in direct sunlight, the leaves will curl, and if you give it too little light, the seedling will stretch. Seedlings need to view a direct light source when growing outside to avoid straining. A sunny windowsill with more than half a day of sunshine works wonders if you’re inside. Otherwise, a supplement of 24 to 30 inches from a grow lamp is ideal. At most, your seedling should stretch no more than 6 inches.

5) Watering Your Cannabis Seedling

It’s recommended to use bottled, distilled, or filtered water for cannabis plants, both young and old, because these are chlorine-free. If you’re using tap water, wait 48 to 96 hours before watering to let any chlorine evaporate. Boiling for 20 minutes is another way to get rid of chlorine. After soaking your seedling pellet, it should contain all of the moisture your plant requires before it emerges from the earth under normal conditions. It will only need approximately a shot glass worth of water every week to keep the medium wet as it develops. Seedlings don’t consume much water, which is understandable considering their small stature. Your plant will thrive in a moist but not dripping wet growth medium. It’s just as dangerous to overwater as it is to dry out!


Damping off occurs when a seedling is placed in an overly damp environment. The immune system of the young plant is insufficient to fight off a fungus, which causes the plant to rot from the bottom of the stem. If this happens, the plant will sag and die if it is not handled. Spray a 0.5 percent hydrogen peroxide solution over the afflicted region to help battle the infection. However, the easiest way to avoid this is to keep your seedling from becoming too wet.

6) First Cannabis Seedling Leaves & Hardening Off

The cotyledons are the first leaves that emerge from the earth. These little leaves are bursting with vitality. Before falling off, it will expand to roughly 1/4 inch in size. Your second set of leaves will appear as single blades with serrated edges, similar to typical pot leaves.

They’ll grow to be many inches long. Your first proper set of leaves will arise during their development. Typically, three blades are used. Your plant is “hardening off” about this time. You’ll see that the stem begins to harden and grow a thicker skin. As the plant’s leaves grow larger, it will withstand more sunshine, so place it in more direct light—the more light, the better!

7) Transplanting Cannabis Seedlings

When the baby cannabis plant has hardened off, roots will begin to emerge from the bottom of the seedling pellet about ten days after germination, indicating that the plant is ready to be moved into a larger pot. During this step, be extremely careful not to injure the roots. Any stress will stifle its development.

Dig a tiny hole for the seedling in the larger pot, add some rooting booster to the bottom of the hole, and gently plant the entire seedling pellet containing your weed baby.

Now bury it so that the dirt is level with the base of its stalk. Please give it a good soaking to get the roots established in the earth, then don’t water it again until the pot feels light in weight when you take it up.

8) Grow Weed Plant, Grow!

Suddenly, the plant will change right before your eyes. She’ll grow taller and branch out, producing leaves and a web of branches. As the grower, it is your responsibility to satisfy her requirements to attain her maximum potential.

This is the vegetative stage of your marijuana plant. The objective at this stage is to maintain her healthy while allowing the plant to grow as large and robust as possible so that she can support a large number of blossoms.

9) Marijuana Flowering Stage

When your once-baby seedling, now a gorgeous, bushy cannabis plant, is exposed to 12 hours of persistent darkness, she will blossom. She’ll go through a vegetative growth spurt to provide the plant the size and strength to sustain those upcoming buds. Her growth then slows as she devotes her efforts to developing buds. Flowers begin as leaves that form a clump at the top of each plant’s main colas. Pistils (white hair-like structures) will appear. These develop into tiny buds. These budlets become fatter and more stacked as time goes on. More pistils will be added to the plant in the future. Over the buds, crystals begin to form. These are trichomes, and they’re where all the therapeutic cannabinoids come from!

10) Harvesting Your Weed Plant

It’s never easy to say goodbye. Your cannabis plant, on the other hand, understands when it’s time to bloom. And so will your nose. As her buds mature, the signature aroma for which she is known will emerge in full force. Her waving goodbye begins as the scent of her flowers begins to sway just a smidgeon.

It is time to harvest your weed when:

  • When the color of the stigmas (hair-like structures that protrude from the buds) has changed from white to orange/red/brown by 80% or more, it’s time to harvest your cannabis.
  • The color of the trichomes (delicious crystals on the buds) should change from clear to milky.

Her trichomes are the most precise indicator of harvest readiness. The secret to it all is these delectable crystals, which can only be seen under magnification. When the trichomes are milky/cloudy in color and have spherical, mushroom-shaped heads, the THC content is highest. THC degrades to another cannabinoid, CBN when they turn amber.

Remove any remaining fan leaves, cut each branch off, and hang the branches upside down to dry in a dark location with a humidity of roughly 50% and a temperature of around 65°F.

Starting Weed from Seed: Frequently Asked Questions

When it comes to cannabis seeds, how long do they last?

This is dependent on how they are stored. Over time, all seeds lose viability, but seeds with better genetics will stay longer. Weed seeds can be kept for one to two years in a cool, dry area. Your seeds may be stored in the refrigerator for many years if kept dry and away from moisture; they will mold and not germinate if they get wet.

How can you speed up the growth of your weed seedlings?

Cannabis is a conscious entity, and she is most vulnerable when she is a seedling. Some things, such as her timeline, are unchangeable. A seedling’s growth will be aided by increasing the light she receives to 24 hours every day. It will set her up for success if she can control her surroundings so that it is not too hot or humid and does not overwater.

When should cannabis seedlings be transplanted to larger pots?

When the plant has hardened off, her second set of true, serrated leaves has appeared, and roots begin to emerge from the bottom of the seedling pallet; your seedling is ready to be transferred. It’s about a week after germination at this point. Your seedling should not stay in the seedling pellet for more than ten days.

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