Some people advise keeping young seedlings under fluorescent lighting for a while but this doesn’t provide them with the correct spectrum for photosynthesis. It is best in our opinion to place seedlings directly under low wattage H.P.S lamps, 150/250/ or 400 watts, at a good distance away.
Once the plants are a few days growing they need to be moved closer to the lamps in order to prevent stretching. Move them as close to the lamp as the tops of many plants would be comfortable. (30-60cm depending on the lamp size.)
High temperatures result in excessive soil desiccation and injury to seeds and seedlings. We recommend a constant temp of 20-25 degrees.
Set the tray under either fluorescent lighting or a low-wattage H.P.S. to keep the newly planted seeds warm. At this stage no light is necessary but warmth is important, and low light provides this without drying the pots out. An air temp of 20-22C is ideal, a degree or two lower than the soil temp (around 23C). Humidity if regulated can be set for around 60%.
Put the cannabis seeds in Jiffy pots
If you sow your seeds too shallowly the seeds can dry out. A depth of between .5 to 1cm is about right.
Now that the plants have strong light they require more water and nutrients as well. A light organic feed or nutrient solution starting with an E.C of no more than .8 (with the water already at .5) can be sprayed directly on the plant and watered into the soil. The seed-raising mix contains no nutrients so within a few days the plants will be hungry.
6. Large jiffy pots + seed-raising mix or
7. Rockwool starter blocks
8. Fine sprayer
9. Identification labels
A certain amount of water is essential for germination, so maintaining constant soil moisture during the germination period is vital. Spray the soil surface with a fine mist, or cover containers with glass or a damp cloth to prevent your soil drying out. Make sure you remove the cloth once the shoot emerges.
They are usually sold in small packs of 12, 24, or 36. You may find larger bags of 50-200 and bulk packages of up to 2000 pellets.
One pellet can contain up to three seeds. However, tiny seeds may be difficult to place, so you should determine your most convenient number. If you drop too many seeds, you may need to thin your plants later – meaning plants that do not get to grow.
Sprouting marijuana seeds in regular soil is a common practice. Soil is a natural medium and can protect the seeds as it develops its fragile roots. For this option, be sure to start with the right type of soil for marijuana. Use a seed starter or fertilized potting soil with a pH of around 6. Soil has both minerals and spores that supports growing marijuana plants.
Locate your container
Peat is an organic medium that provides plenty of nutrients for sprouting seeds . It is made from sphagnum peat moss, which has a high water-holding capacity as a result of its fluffy and light texture. Peat provides excellent root aeration, making it easy for roots to grow without interference.
You can use tap water or distilled water. Keep in mind, tap water may have chlorine, which is harmful to your plant and cause it to dry out faster . However, you don’t have to buy distilled water to prevent chlorine problems. Evaporate the chlorine by pouring your water, and let it rest for some time. Use very warm water, around 95oF, to help the the pellet expand faster.
While Rockwool is a suitable environment, you’ll need to adjust it some for marijuana. First, you’ll need to add fertilizers – around 600 parts per million. You’ll also need to reduce the pH, which is too high to support sprouting. It’s also a bit dangerous to handle. Wear gloves and protect your mouth and eyes while handling it.
Place the seed in the middle of the enlarged pellet. Don’t place the seed too deep, or it will not sprout.