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If you really want to reuse your old soil, you need to amend it with fresh nutrients. Before that, you need to make sure that your soil is free of contaminants.
This is what cannabis seeds need to sprout:
5. IMPROPER HUMIDITY FOR SEEDLINGS
Even if every stage up to harvest has gone splendidly, the final (and most maddening) mistake you can make is harvesting too early or too late. You don’t want to make the chop before your buds reach peak potency, but you also don’t want to leave them hanging, so to speak.
For this reason, growers must provide the right amount of light for their plants. Too little, and the growth and yields of your plants will suffer. Too much, and photoperiod strains won’t flower (plus, your energy bill will spike if you’re growing indoors).
The RQS Starter Kit comes with everything you need to give your cannabis seeds the best and safest start in life. It comes with a propagator and lighting, Easy Start seedling pots, perlite, and beneficial bacteria to encourage germination and growth. It even includes three popular cannabis seeds, so you can start right away! When your seedlings have reached 2–3cm, you can cut up the pots and easily transplant your seedlings into their growing medium.
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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.
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To plant cannabis seeds indoors, first soak the seeds in lukewarm tap water for 12 hours. Discard any seeds that float to the top. Then, place the seeds on a damp paper towel on a plate with 1 inch (2.5 cm) of space between each seed. Cover the seeds with another damp paper towel. Keep the seeds in a spot that remains between 70-80°F (21-27°C), and spray the paper towels with water whenever they start to dry out. The seeds will sprout in 2-3 days. When they do, fill pots or a growing tray 3/4 of the way with loose potting soil that has a pH between 5.8 and 6.3. Press the soil down lightly, leaving some air in it. Then, use a pencil to poke 1 inch (2.5 cm) holes in the soil. Place the sprouted seeds vertically in the holes and fill the holes with potting soil. Water the soil thoroughly and place the pots or tray in a spot that’s always 75°F (24°C) or warmer. Set up a grow light over the seeds and leave it on at all times. Water the seeds every day so the soil doesn’t dry out. The seedlings will emerge in 2-4 weeks. To learn how to use cool white grow lights to help your cannabis seeds grow, keep reading!