How Exactly to Plant Cannabis Seeds Indoors

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Growing cannabis at home can be a fun project and a nice way to have your own cannabis plants on hand. You may want to grow cannabis indoors due to inclement weather in your area or due to a lack of green space in your yard. Start by germinating the seeds. Then, plant the seeds in soil or in a starter cube. Once the seeds have been planted, care for them properly so they grow and thrive.

Germinating the Seeds

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    Soak the seeds. To make germination easier, consider soaking the seeds in tap water for 12 hours in a bowl. Viable seeds will sink to the bottom of the bowl and non-viable seeds will float.

    • After 12 hours, place the viable seeds on a towel.
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    Wet one paper towel and put it on a plate. Paper towels are thick enough to retain the moisture needed to help the seeds germinate. Place one paper towel under running water until it is wet to the touch, but not dripping wet. Use a ceramic dish or plate, as it will be strong enough to hold the towels and the seeds. The paper towel should cover the dish or plate.
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    Put the seeds 12 inch (1.3 cm) apart on the towel. Place the blunt end of the seeds, the end that does not have a point, on the towel, spacing them apart so their roots do not get tangled.

    • If you do not have enough space on one plate for all your seeds, soak two more paper towels and put the remainder on a new plate covered in a wet paper towel.
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    Wet other paper towel and place it over the seeds. Make sure the wet towel makes contact with the seeds.
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    Store the seeds at 70 to 85 °F (21 to 29 °C). The cannabis seeds need to sit at a warm, consistent temperature to germinate. Store the seeds out of direct sunlight in a warm area, such as the top of your refrigerator.

    • You can try using a heat lamp near the seeds to keep them warm. Do not warm the seeds up too much, as you do not want your heat source to dry out the paper towels.
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    Keep the paper towels moist. Spray the top towel with a spray bottle of water to keep them moist. Check the paper towels several times a day to ensure they do not dry out.

    • If the seeds become too dry, they could die and never germinate.
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    Wait for the seeds to germinate. Viable cannabis seeds will usually open with 48 hours. You should see the roots start to appear within a few days, depending on the seed type. Once the tap roots are 14 to 12 inch (0.64 to 1.27 cm) long, the seeds are ready to be planted.

    • Be very careful with the seeds as they open. Avoid prodding, pulling, or touching the seeds, as you do not want to damage the roots.
    • Any seeds that have not opened and grown roots within a few days should be discarded, as they are not viable.
Part2

Planting the Seeds

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    Fill small, 2 inches (5.1 cm) garden pots with potting soil. Get plastic garden pots that are small enough to house the seeds. Look for garden pots at your local garden supply store or online. Use potting soil that is loose and airy. The potting soil should be moist to the touch. Fill the pots ¾ of the way with the soil.

    • As an alternative to soil, you can use starter cubes from your local nursery or online. Starter cubes are pre-cut growing pods made of composted bark. They contain a hole where you can place the cannabis seeds and grow them in good conditions. Basic starter cubes are inexpensive and easy to use.
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    Make a 14 inch (0.64 cm) deep hole in the soil. Use a pen or pencil to poke a hole in the soil for the seeds. Do not poke the hole too deep or too close to the surface of the soil.

    • If you make planting holes that are too shallow, the seed’s roots will not have enough soil to grow well. If you make the planting holes too deep, the seed will have a difficult time sprouting.
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    Use tweezers to drop the seeds in the hole. Make sure you drop the seeds with the tap root facing into the hole. The tap root is the long root that will grow out of one end of the seed.

    • Do not pull or tug at the seeds when you pick them up with tweezers. If they are stuck to the paper towel, wet the towel with water to make the seeds easier to pick up.
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    Cover the seeds with soil. Gently cover the seeds in 14 inch (0.64 cm) of soil so they can grow.

    • Do not press hard on the seeds when you cover them, as this can disturb their growth.
    • If you are using starter cubes, pinch the top of the holes in the cubes closed.
     Part3

Caring for the Seeds

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    Keep the seeds out of direct sunlight in a moist area. Do not put the potted seeds on a windowsill or near a heater, as this will make the air too dry and hot. A closet or a basement are two good indoor spots for the plants to grow.

    • Maintain a growing temperature of 75 to 85 °F (24 to 29 °C) for the plants so they thrive.
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    Wet the soil one to two times a day. Use a spray bottle to keep the seeds moist. Make sure it is moist to the touch, but not soaking or dripping wet. Avoid pooling the soil with water, as this can lead to growth issues due to over watering.

    • Stick to a regular watering schedule so the plants get enough moisture. You can plan to spray the plants in the morning and then again at night so they get the water they need.
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    Use cool white grow lights. Your cannabis seeds need light 24 hours a day, seven days a week to grow. Use cool white grow lights that have a consistent temperature of 72 °F (22 °C). Keep the lights 2 inches (5.1 cm) from the pots. Use 3 to 5 watts of light for each pot.

Grow lights range from $200 to $1,200 USD depending on the size and model.

    • You can get cool white grow lights at your local hardware store or online.
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    Avoid touching or handling the seeds as they grow. Touching or handling the seeds can damage them and stunt their growth. With the right growing conditions and care, your seeds should sprout and poke out of the soil within five to ten days.
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