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starting marijuana seeds in rockwool

Can I put germinated seeds in rockwool?

Guide On Germinating Seeds In Rockwool Cubes Therefore, rockwool cube is a great choice to use in germinating seeds because rockwool cube has the ability to retain moisture. Rockwool cubes will keep your seeds moist at the same time preventing your seeds from sitting in a waterlogged environment.

Can you germinate seeds in a hydroponic system?

Here are just a few reasons why you want to start seeds in a hydroponic system as opposed to soil: Much cleaner than starting seeds in soil. Seedlings grow faster after germination. Easy to transplant into a larger hydroponic system.

How do you transfer seedlings to hydroponics?

Spread the seedling’s roots over the soilless medium in the pot. Add soilless medium around the seedling’s roots and stem to hold the seedling in place in its pot. Repeat the procedure to transfer additional seedlings to netted pots in a hydroponic system.

Why wont my seeds germinate in rockwool?

If soil conditions are too wet, an anaerobic condition persists, and seeds may not be able to germinate. Do not leave your rockwool totally submerged in water! If your soil (or in our case rockwool) is too cold or too hot, your seeds may not sprout.

Can roots grow through rockwool?

Cuttings can also be successfully grown in rockwool cubes. Just take a cutting that has been dipped into rooting hormone and plant the end into a 1.5-in. rockwool cube. Cubes can be placed directly into a growing tray and then watered.

How often should you water seedlings in rockwool?

Rockwool holds about 80% water and 20% air when oversaturated and needs to dry out (similiar to a soil-based medium) before it is watered again. In an ideal environment, Hugo Rockwool blocks generally need watering once a day in the Vegetative Growth Stage and twice a Day in the Bloom Stage.

Do hydroponic gardens need special seeds?

Do you need special seeds for hydroponics? No, you definitely don’t need any “special seeds” to use in hydroponic gardens. Using starter cubes of rockwool to germinate the seeds is the preferred method.

Can hydroponic seedlings be transplanted to soil?

Can You Transplant Hydroponic Plants To Soil? Yes, you can safely transplant hydroponic plants over to soil. Other growers may move plants over to soil pots so they can sell them. It’s best to take care when transitioning water-grown plants to the soil because of the dangers of transplanting shock.

When should I start feeding my hydroponic seedlings?

As for when to start using them, a good rule of thumb is to start using them when your plant begins to grow its first true leaves. The leaves that first sprout (after germination) on a seedling contain all the nutrients the seedling will need for the first few days of its life.

Can you put rockwool cubes in soil?

Rockwool cubes, 1 or 2 inches wide and 1 1/2 inch deep, are used for germinating seeds for seedlings that are then transplanted into soil or hydroponic gardens, reveals Simply Hydroponics. Cubes 3 and 4 inches wide are used as a primary growing medium for small plants.

Starting Cannabis Seeds

This is one of the easiest germination methods and doesn’t leave a lot of room for error. Cannabis seeds and clones can be expensive, and sometimes we have genetics we just can’t afford to lose. When that’s the case, germinate your cannabis with one of the following recommended option to ensure as close to 100% germination rate as possible.

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Rapid Rooters (Highly Recommended For All Setups)
Rapid Rooters are easy to work with – you just stick your cannabis seed in the Rapid Rooter (pointy side down), keep your seed warm and slightly moist, and let the Rapid Rooter do its magic.
Sprouts emerge and roots appear in just a 4-14 days.
Rapid Rooter starter cubes are suitable for all growing methods, including hydroponics, coco coir and soil. They work for every setup and come from General Hydroponics, a trusted company (the same one used by NASA) which is known for the quality and consistency of its products.
I highly recommend using Rapid Rooters over any other starter plugs. They are less prone to problems and work great with any growing medium (including hydroponic systems).

Pros of Rapid Rooters
Easy to Use – You Can’t Really Mess Up
No Prep or Setup – Open the Package and Go
Some of the Best Germination Rates of Any Method

Cons of Rapid Rooters
Can only get 50+ at a time (General Hydroponics currently does not offer fewer plugs per package)
After opening the package, you only have a week or two before they dry out, so if you’re only germinating one or two seeds, you’ll end up having to throw many of the Rapid Rooters away.

These are Round on bottom (won’t stand up by themselves without support) unless you squish or trim the bottom so it’s flat & will stand on its own until placing directly in final destination (hydro, soil, coco coir, etc). These are the best choice for a hydroponic setup where the Rapid Rooter will be placed directly in the final destination. In our hydroponic setups, we’ve had almost 100% germination rates with Rapid Rooters, better than any other seedling cube we’ve tried.

Perfect for cloning or starting seeds with a humidity dome (standard 10-inch by 20-inch dome like this one – 7-inch height recommended for cannabis seeds or clones)
Easy to transplant to new destination
Just add water and seeds, that’s it!

Rockwool Cubes (Not Recommended)
It’s often hydroponic cannabis growers who use Rockwool cubes since these can be safely placed in hydroponic setups, hold a lot of moisture, and are resistant to mold. Rockwool is cheap and easy to find. It comes in convenient cubes. But it does have some major drawbacks…

Pros of Rockwool
Cheap & Easy to Find
Inert Medium (useful for hydroponic growers)
Cons of Rockwool
Bad for the environment (unnatural material that does not break down)
Bad for your health (especially your lungs) – wear gloves and cover your mouth/eyes when handling Rockwool
Has a pH that is too high for cannabis, so it must be thoroughly rinsed and treated
Poor cloning and germination rates
Difficult for new growers

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Rockwool cubes are bad for the environment
Rockwool is not a natural material – it’s made by heating rock and chalk to 3,000°F and air is blown through the mixture to create thin fibers of rocky material
It does not break down naturally and therefore after Rockwool is created, it will remain in that form basically forever, filling up landfills without breaking down for thousands of years.
Rockwool cubes can be bad for your health
Rockwool is dusty and needs to be rinsed thoroughly before use. Little pieces of Rockwool and dust can easily get in your eyes, skin and mouth. Small strands or fibers can get lodged in your lungs if you breathe in Rockwool dust, and it’s unknown if these fibers can ever get out again.
Protect yourself! Always use a mask, goggles and gloves when working with Rockwool.
Rockwool cubes have a high pH until they’re treated
New Rockwool cubes have a high pH – too high for healthy cannabis seed germination. Therefore it’s important to thoroughly rinse Rockwool cubes in pHed water, then let them soak in pHed water overnight before use. Since Rockwool holds onto a lot of water, after soaking they should be given a few days to dry out before planting seeds or making clones.
Rockwool cubes do not get great germination rates
Rockwool can be difficult to germinate marijuana seeds in, so I recommend most beginner growers sprout their seeds using another method like Rapid Rooters (mentioned above) which can also be used in hydroponic applications but are less prone to germination problems.
Many growers have placed seeds in Rockwool cubes, only to wait for weeks and never see seedlings appear.
Some growers seem to have no problems, yet many other growers suffer through very poor germination rates. Some seed companies will not honor seed germination guarantees if the grower uses Rockwool because it is notoriously bad for germination.
If you do use Rockwool, it’s recommended you germinate your seeds using another method like the paper towel method, then transplant your seeds to the Rockwool cubes after roots have already appeared.
Even when following all the best practices, we just have not gotten great germination rates with Rockwool cubes, and it’s common for new seedlings not to make it.
We also had trouble rooting clones in Rockwool. Rockwool cubes just don’t hold enough air to get plenty of oxygen to the roots, and they tend to hold onto a lot of water and get waterlogged easily. Since Rockwool can hold a lot of water, it’s prone to “drowning” seeds
I highly recommend using Rapid Rooters instead for your hydroponic application (or any grow setup), as they are much more user-friendly and tend to get far better germination rates.

Can you grow cannabis in Rockwool?

Rockwool is a great medium for growing marijuana. Rockwool harnesses the power of natural stone to produce a fluffy and aerated growing medium ideal for cannabis growing. This material drains well, supports root development, and arrives in a cuboid shape that is easy to transplant into hydroponic or soil-based systems.

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How much should I water my cannabis seeds?

Get your marijuana plants on a watering schedule—as they grow out of the seedling stage, watering every two to three days is ideal. Keep in mind that as plants get bigger, they will need more water and need to be watered more frequently.

How do you plant rockwool cubes?

Sowing Seed: Place two or three seeds in the hole at the top of the rockwool growing medium. Water using a hydroponic nutrient solution. When the plants are 2 to 3 inches (5 to 7.6 cm.) tall, they can be transplanted into soil or placed in a hydroponic garden.

Can you overwater rockwool cubes?

Don’t: Overwater Plants in Rockwool The appropriate level of runoff should not exceed 30%, which means very little water should come out the bottom of a rockwool block. If you are watering and the amount of drainage exceeds 30%, you are probably overwatering. This may lead to algae growth.

Can you grow in just rockwool?

Cuttings can also be successfully grown in rockwool cubes. Just take a cutting that has been dipped into rooting hormone and plant the end into a 1.5-in. rockwool cube. Cubes can be placed directly into a growing tray and then watered.

When can I transplant rockwool cubes?

Transplant! When your seedlings are about three inches tall and have roots protruding from the bottom of the rockwool cubes, it’s time to transplant. But about a week before you do, you should harden off your seedlings.

What pH Should I soak my rockwool?

Rockwool should be thoroughly soaked in pH balanced water before use. Most rockwool cubes have a pH of around 7.8, which is higher than the plant’s preferred levels of 5.5 – 6.5.

How long do you soak rockwool cubes?

Adjust the pH slowly until it reaches the desired 5.5; it is critical the pH doesn’t drop below 5.0 since it will start todamage the rockwool fibers when it is too acidic. After Then submerge the rockwool cubes in the water and allow them to soak for up to 24 hours.

Can you put rockwool cubes in soil?

Rockwool cubes, 1 or 2 inches wide and 1 1/2 inch deep, are used for germinating seeds for seedlings that are then transplanted into soil or hydroponic gardens, reveals Simply Hydroponics. Cubes 3 and 4 inches wide are used as a primary growing medium for small plants.

How often do you water rockwool cubes?

Rockwool holds about 80% water and 20% air when oversaturated and needs to dry out (similiar to a soil-based medium) before it is watered again. In an ideal environment, Hugo Rockwool blocks generally need watering once a day in the Vegetative Growth Stage and twice a Day in the Bloom Stage.

How do you transplant rockwool to soil?

Dig a hole in the soil that is the same depth as the rockwool cube and twice the diameter, using your hand. Remove any rockwool from the outside of the cube that you can gently tug away. Place the cube into the prepared planting hole and pack the soil around the base of the seedling.