When To Put Marijuana Seeds Under Lights

When To Put Marijuana Seeds Under Lights

Before putting your cannabis seeds under lights, make sure you understand the various factors that influence the growth of your cannabis plants. Proper substrate, moisture, and heat are all important in growing your marijuana plants. And the right light schedule will make the difference between success and failure. Follow these tips to ensure that your seeds germinate properly. And best of all, enjoy growing your own cannabis plants. Here are a few tips to help you grow marijuana seeds indoors:

Proper substrate

Selecting the right substrate for growing marijuana seeds under lights requires a little bit of knowledge. You may be tempted to use soil, but this is not a good idea. In fact, soil can compact over time from repeated watering and irrigation. Soil that is oxygenated can help your plants thrive. Several options for substrates include coconut, vermiculite, perlite, and volcanic lava rocks. The best part is that these materials do not alter the pH or EC of the soil, which means your plants will thrive.

It is vital to maintain a consistent humidity level for your plants. If the outside air is cool and humid, it will be just right for seedlings. The room should remain at a comfortable level of humidity, but low enough so that the seeds can germinate. Keeping the humidity low in the room will help seedlings develop into healthy plants. It is also essential to keep the substrate moist but not soggy.

Using the correct soil for cannabis plants is vital to their success. Unlike orchids, cannabis seeds grow best in airy, nurturing soil. This is because cannabis seeds originate in semi-arid biotopes. Most modern cannabis hybrids contain genetics from semi-arid regions. Because they are not adapted to wetlands, they prefer well-drained soil. In addition, seeds rot in water-logged puddles.


To germinate marijuana seeds, you will need to keep the temperature and humidity of the growing medium consistent between twenty and fifty percent. You should also make sure that the substrate is consistently moist and has the ability to drain. Once the seeds are germinated, they should be covered so that they can push through the substrate and develop a strong root system. The cotyledon, or seed casing, may be attached.

Before placing seeds under the lights, be sure to inspect the quality of the seed. Bad quality seeds will produce weak plants, so check them carefully before planting. A good rule of thumb is to avoid seeds that are pale or white, as these will have less chance of sprouting. Dark or damaged seeds should still be planted, however. Moisture levels should be monitored regularly. Moisture is critical to the health and productivity of the plants.

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When placing marijuana seeds under the lights, moisten them with a damp kitchen tissue or a cotton pad. A cotton pad needs about five short sprays to keep the soil moist. Too much moisture will cause the plants to rot. Keep the soil slightly moist, as too much moisture at the root level will suffocate the seeds. Using a moist cotton pad is an effective option and the Dutch Passion team recommends it.


While germination takes about a week, cannabis seeds should be started indoors at a constant 60-70 percent humidity. In the first few days, you should use a low-lighting setting to allow the seeds to find the light they need. Freshwater, with a pH level of 6.5 to 7.5, works well as a dripping solution to spray over the leaf surface. This will help to wash dirt and unclog the stomata.

Once the seedlings emerge, it may take one to seven days to grow to its final height. Keep an eye on the temperature and try adjusting the height of your lights. Once the first plants have emerged, you can continue your marijuana grow. You can also join marijuana grow forums and seek out advice from grow experts. There are forums full of knowledgeable growers who can help you get started. But don’t give up just yet!

One of the most popular ways to germinate marijuana seeds is to place them in a glass of water. This method is simple enough for beginners, but you should use warm water rather than soaking. A glass of water at 22 degrees C (71 degrees F) is ideal for germination. After three to five days, the seeds should open up and show tiny white tips. You should transfer the seeds to soil pots once they have two to three mm roots.

Light schedule

A good cannabis seed grows best under a light schedule that is 12 hours on and 12 hours off. This light schedule is ideal for feminised marijuana strains. Autoflowers, however, need a longer light schedule to grow optimally. Ideally, the light should be on for eight to twelve hours each day and should be off for six to eight and a half hours. These light schedules are ideal for autoflowers, as they grow much faster and produce a higher yield.

You can also grow a marijuana plant with a no-veg light schedule. This method is efficient, fast, and economical because the cannabis plant will skip the vegetation phase. By eliminating the vegetation phase, the cannabis plant will go straight into flower mode from seedling stage. This method may not give you the highest yields, but you’ll be able to harvest more weed with less space. To learn how to grow marijuana without a veg schedule, read our guide to cannabis growing.

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For the vegetative stage, you can calculate the duration of the day by measuring the height of the plant. You may have to leave the plant in this stage until it reaches six to eighteen inches. In the flowering stage, the plant doubles its height and will need a minimum of twelve hours of light per day. Aside from the height, the balance of light will play an important role in this phase. The plant will need between twelve and fourteen hours of light per day during this phase.


Once you’ve decided to grow marijuana plants, you may be wondering when to put seeds under lights for pollination. It’s important to remember that the temperature and humidity of the environment can make or break seed germination. Seeds can be sensitive to light, so they should be stored in airtight containers. Relative humidity should be low at this point, as they need a constant temperature to germinate properly.

Female plants should be at least two to three weeks into flowering. The ideal time to apply feminized pollen is when the buds have developed in the stem and leaves. By this time, the flowers should be covered with wispy white hairs that capture pollen in the wild. Only those buds that come in contact with pollen will develop into seeds. Ideally, female marijuana plants should be in their third week of flowering before applying pollen.

After the male plants have emerged, they should be separated from the female plants. Female plants will produce seedless flowers if they are not pollinated. To keep the pollen dry, mix it with flour and store it in an airtight container or freezer. It will keep for several years. Pollen that has been stored in a sealed container can last for years, though the viability will decrease over time. Germination testing is a good way to confirm that the seeds are still viable and that they are not spoiled.


If you’re wondering when to put marijuana seeds under lights for growth, here’s the basic answer: when they’re a seedling. The first set of leaves will typically consist of three blades, and they’ll start to harden off around this time. After that, they’ll transition from a single leaf to many, or “fingers,” as they’re sometimes referred to.

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The best time to plant marijuana seeds is as early as two weeks after you’ve germinated them. After a week, they’ll have sprouted tiny roots and should be planted in soil. A few days later, they’ll grow into a few millimeter-long plants. It’s best to put them under lights for more than 12 hours a day if possible. After that, you can turn on the timer so that they receive about 12 hours of strong light each day.

When to put marijuana seeds under lights for growth depends on your region and your desired height. In cold climates, you’ll need to wait until the end of winter to plant seeds. In northern hemisphere climates, the time to start growing marijuana seeds should be a few weeks after the equinox. In cold climates, you’ll have to wait until the last frost, as freezing temperatures can kill a cannabis plant. Also, it’s vital to select the right strain of seeds based on local weather conditions.

Signs of a healthy seedling

When it comes to marijuana growing, it’s essential to be mindful of certain signs of a healthy cannabis seedling. Cannabis plants can suffer from heat stress, which is why it’s important to give them adequate light and humidity. Heat-stressed plants’ leaves can turn crispy or yellowish. High temperatures, low humidity, or even fans that are too powerful can all cause heat-stress in cannabis seedlings. Another telltale sign is the soil drying out or cracking around the stems.

The best way to keep your cannabis seedlings from suffering from light stress is to keep the lighting at a lower intensity than what is required for outdoor grow. It’s important to keep the temperature around 20-25 oC. You can also keep the plants under lights from germination to the beginning of the second or third week. If the seedlings have second and third sets of leaves, it’s a good time to move them outside. You can give them an extra hour or two of sunlight daily. After two weeks, you can move them permanently outside.

The first signs of a healthy marijuana seedling are the presence of the cotyledons, or the first two leaves of a cannabis plant. The cotyledons open up when the seed germinates. The weed seedling’s true leaves are fingered or serrated. It should have healthy, vibrant green leaves. After all, it is not easy to tell if your seedling is experiencing any problems if it’s already under lights.

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