Starting Cannabis 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. I have a couple of seeds that I have germinated already. I was wanting to know is it better to start them in a solo cup of soil to build up a root ball then… 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.”

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.

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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.

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.

should I plant my seeds in a solo cup or final pot from the start?

I have a couple of seeds that I have germinated already. I was wanting to know is it better to start them in a solo cup of soil to build up a root ball then transplant into final pot or just plant them in the final pot from start to finish? I will be using fox farm soil. I will be using 2 gallon smart pots. I will be growing auto flowers.

grorite
Well-Known Member
grorite
Well-Known Member
WattSaver
Well-Known Member

The only reasons to use a small pot to start is to save on nutes or its the conditions you have to grow in, like a small veg box. But with an auto, I’d put it straight into your 2gal and go.

jcdws602
Well-Known Member

Start in the solo cups. I recommend using fox farms light warrior mix to start seedlings and new cuttings. after 2-3 weeks you can transplant into fox farm ocean forest or whatever soil you want.

edit. just realized they are autos. you can still start in solo cups
. you just don’t want them to stress during transplant. so be careful that’s all

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texastiger707
Active Member

ok thank you. I was going to use fox farm ocean forest soil. My hydro shop was out of it. So I had to get fox farm happy frog. So is happy frog still good for autos?

grorite
Well-Known Member

i use happy frog had some pretty bad nute burn when i started seeds in it i suggest you get some cheap seed starting soil

Vindicated
Well-Known Member

You always want to have two inches of space between the root tips and the edge of your container. As long as you do that, you can pot up as often as you want. Larger containers means less watering and feedings, but it also means less room to grow plants. So you have to find a balance.

The first time you grow a new strain, your not going to know how fast those roots are developing, so if you can, error on the safe side and go with a larger container. However, with autos the limit seems to be around 7 to 10 gallons. The plants only get 1-2 feet, so anything beyond 10 gallons is over kill IMO. In fact, many do fine in 3 to 5 gallons containers. A lot also has to do with your particular setup (timers, feeding frequency, planting medium, etc).

What has always worked for me is starting in 1 gallon smart pots using a good potting mix formulated for seed germination (I use Miracle Gro Seed Starting Mix), then I make sure to transplant before the end of the third week. Any longer and the roots will start poking out the bottom and sides of the smart pots. It also helps to let the plants get a little dry but not wilting just before transplanting and water immediately afterwords.

texastiger707
Active Member

You always want to have two inches of space between the root tips and the edge of your container. As long as you do that, you can pot up as often as you want. Larger containers means less watering and feedings, but it also means less room to grow plants. So you have to find a balance.

The first time you grow a new strain, your not going to know how fast those roots are developing, so if you can, error on the safe side and go with a larger container. However, with autos the limit seems to be around 7 to 10 gallons. The plants only get 1-2 feet, so anything beyond 10 gallons is over kill IMO. In fact, many do fine in 3 to 5 gallons containers. A lot also has to do with your particular setup (timers, feeding frequency, planting medium, etc).

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What has always worked for me is starting in 1 gallon smart pots using a good potting mix formulated for seed germination (I use Miracle Gro Seed Starting Mix), then I make sure to transplant before the end of the third week. Any longer and the roots will start poking out the bottom and sides of the smart pots. It also helps to let the plants get a little dry but not wilting just before transplanting and water immediately afterwords.

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.

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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