Starting Marijuana Seeds In Solo Cups


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In this article, you will see how much cannabis seedlings have grown after one week under 12/12 lighting in Red Solo Cups, and under Agnetix LED lights. Cannabis sativa sp. is commonly known as marijuana and has been grown throughout the world for thousands of years. Cannabis seeds germinate in 3 to 7 days, though some varieties may take 10 to 15 days. While germination is a natural… Categories: Setup. Seedling. Grow Question by MagicPlants17. Best place to get answers to your grow questions. Worldwide community of enthusiast growers will share experience.

One week under 12/12 light cycle in a Red Solo Cup

Can you grow weed in a red solo cup? Can you skip the vegetative stage and go straight to the 12/12 light cycle? We have always wondered if this was possible, so we decided to try it ourselves.

In this video series, we document the process of planting seeds in red solo cups, and then putting them under 12/12 lighting.

In this episode, we review our seedlings after their first week in the flower room.

Growing Marijuana From Seed in a Red Solo Cup

For this experiment, we used regular seeds from Sin City Seeds, that included the strains Rainbows at Night, Hard Cider, and Cart Wheels.

We sprouted the seeds using the paper towel method. And once we had tails, we put them in a red solo cup with coco coir.

Using the 18/6 Light Cycle for young cannabis seedlings

In Part 1 and Part 2, our seedlings remained in our Veg Room under the typical 18/6 light schedule that is used during the vegetative stage. We kept them there for a total of 19 days, counting from the day the seeds were “planted.”

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During that the first week, we filmed the seedlings at five days old. At that size, they were definitely not something you would want to flower. They were just a couple inches above the dirt.

By the second week, we could have put them under 12/12, but at less than five inches, it just seemed like a good idea to get another week’s worth of growth at the 18/6 interval.

Our “12/12 From Seed” Experiment actually had 19 days under 18/6 light cycle

By the third week, our plants were a total of 19 days old and we decided to flower them at that point. They were about the size you would want if you were purchasing a clone from someone. By any standard, still very small plants.

So although we are calling our experiment “12/12 from Seed,” it is really “19 days of 18/6 then 12/12.”

Is this a true “12/12 from seed” experiment? Yes and No. It doesn’t really matter. You still get to see what a seedling is capable of, even with 19 days of vegetative lighting.

Flowering Cannabis in a Red Solo Cup

After one week of flower, the plants have definitely grown. (On second thought, maybe we didn’t need those 19 days under veg lighting after all?)

You can see that the plants have become noticeably bigger. And it’s only been one week under 12/12 lighting! The center nodes are priming to be flower sites. The fan leaves are large and drooping over, soaking up the light.

There’s been no pruning or defoliating on these plants. Not that any needs to be done. But the take away here so far is that it definitely looks like you can flower a plant in a red solo cup. The Agnetix LED lights are very powerful, so this should be an exciting run.

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These plants are bigger than they were last week, and they look like they are ready to produce bud in the coming weeks.

In the next article, we will review the plants after conclusion of their second week under 12/12 lighting.

How to Germinate Cannabis Seeds

This article was co-authored by Lauren Kurtz. Lauren Kurtz is a Naturalist and Horticultural Specialist. Lauren has worked for Aurora, Colorado managing the Water-Wise Garden at Aurora Municipal Center for the Water Conservation Department. She earned a BA in Environmental and Sustainability Studies from Western Michigan University in 2014.

There are 10 references cited in this article, which can be found at the bottom of the page.

This article has been viewed 66,119 times.

Cannabis sativa sp. is commonly known as marijuana and has been grown throughout the world for thousands of years. Cannabis seeds germinate in 3 to 7 days, though some varieties may take 10 to 15 days. While germination is a natural process, factors such as light, humidity/moisture, and temperature must be controlled for cannabis seeds to sprout.

Solo cups vs clear plastic cups for seedlings

I’m gonna plant sprouts in solo cups, but thought it might be cool to use clear plastic cups (to see when roots reach the edges). Would it be bad to use clear plastic cups? Maybe the roots/soil won’t like the light idk?

If you use see through just put a cooler cup on it if you got one that slides over it easily. Good luck and happy growing :evergreen_tree::evergreen_tree::evergreen_tree::facepunch:

Correct, plant roots do not like light and will die if exposed to it for a prolonged period. Roots grow under the ground – a dark environment, period.
Hope this helps. Organoman.

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Debatable when soil vs. DWC lol I first started in water bottles with the tops cut and transplanted when the roots were spaghetti around the bottle :expressionless: lmao they love it, I love. debatable :the_horns::facepunch::ok_hand::+1:

Opaque cups. Roots hate Light. Trust me I am a dwc grower and well all know the troubles of root stress if the roots are exposed to light they can burn, which can in turn cause stress to your lady. It also attracts algae when watered which can in turn lead to much worse things in my opinion anyway. Though I will end with what I always say on this site. There is no “Correct way” to cultivate a cannabis plant. every grower has different methods that work for them. So dont take my advice as gospel use your common sense and I’m sure you will excel with the new seedlings 🙂 Best of luck for all your future harvests 🙂 Peace out

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