55 Surprising Facts About Starting Seeds Without Rockwool For Hydroponics

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55 Unexpected Facts About Starting Seeds For Hydroponics Without Rockwool | Hydroponic Substrate Alternative

• These are not the only methods for germinating seeds but rather some of the most common. You are welcome to do more research and try any method you see fit. The possibilities of gardening are endless which makes it so fun! - Source: Internet
• There’s one last thing to think about when starting seeds in rock wool. You need proper airflow. If your rock wool is too wet and there’s not air flow, you’re going to grow bacteria that’s within the air or that somehow gets on the surface of your growing medium and you’re going to grow mold, not plants. So give your baby seedlings air movement with a fan in the room (doesn’t need to be directly on them), but just keep air moving and your seedlings will thank you for it. - Source: Internet
• Finally drop your plant seeds into the net cup with hydroton. I recommended dropping at least 3 seeds into the cup so you have a higher chance of germination. I dropped 10 lettuce seeds into my net cup due to the seed’s tiny size. - Source: Internet
• The seeds in the photo above were purchased from a big box store, and had a pretty low germination rate. I normally enjoy a near 100% germination rate with high quality seed from High Mowing Seed Company. I don’t get any kickbacks or affiliate cash from them, I simply love their product! - Source: Internet
• Place the air stone in the reservoir and connect the tubing. Connect the other side to the air pump and plug it in. You should see some beautiful bubbles start to come out of the air stone. These bubbles are what will keep the roots of your seeds moist and stimulate growth. - Source: Internet
• Moisten first and frequently. Regardless of the medium you choose, wet but don’t soak it before you plant your seeds. To germinate effectively, seeds need constant moisture, but too much water can drown the first shoots and roots before they have a chance to take hold. Be sure the medium stays damp but not soggy as you wait for them to sprout and in the days immediately after they do. - Source: Internet
• • Avoid harsh, dry heat when warming seeds for germination. Top of a refrigerator or few inches above a radiator simply aren’t the best spots. Kitchen counters are better - or - for the best results everytime - invest in a heat mat! - Source: Internet
• Due to its porous and fibrous nature, it also drains excess water yet can retain an adequate amount of moisture at the bottom. Roots can easily permeate rockwool, allowing the root system to reach the nutrient-rich water. This is an important factor to consider in both germinating seeds to growing plants in full. - Source: Internet
• Seed spacing will depend on how rapidly the root system of your desired plant grows. Experiment with spacing to see what works best for you. I don’t pay much attention to spacing. After all, it only takes 3 or 5 days to have nicely germinated seeds. - Source: Internet
• Soak to test. Many seeds remain viable for years, but as they age, they lose water in their cells and the plant embryo inside the seed gradually shrivels. You can give older seeds a jump-start and discard any duds before planting by soaking them in a bowl of room-temperature water overnight. Those that float after soaking will not germinate. The seeds that sink to the bottom have absorbed water and are ready to sprout. - Source: Internet
• If you want to use the tea method make a weak tea with a bag or instant tea at the rate of one bag or one tablespoon of tea per half gallon of water. Let tea cool completely before immersing seeds. After the 24-hour tea soak, remove seeds from the tea, drain and prepare for planting. Use tweezers, pick up one seed at a time and place in prepared, labeled containers of soil or starter cubes. Scratch a little of the potting soil over top of seeds and gently tap down with your finger. - Source: Internet
• • Use plain water while seeds are sprouting. After new leaves appear apply nutrients at 1/2 strength. I use and recommend Dyna-Gro Grow 7-9-5 formula. - Source: Internet
• Prepare the rockwool cubes for use, making sure to soak them in pH adjusted water to bring their pH down between 5.5 and 6.5. To Plant Seeds: - Source: Internet
• Go knuckle deep. Some types of seeds, such as lettuce, need light to germinate, so you want to set them on the surface of the planting media. Most seeds, however, germinate below the surface. Push them in about as deep as the first knuckle (closest to the fingernail) on your index finger. - Source: Internet
• While it is known the rockwool fibers can cause some skin irritation, gloves are a solid remedy to an easily avoidable problem. If the fiber dust is a concern, then a simple mask will suffice. Applying moisture to the rockwool will bind the dust to the material making this problem easily remedied. - Source: Internet
• Light when visible. Except for the few types of seeds that need light, your starts will germinate best in the dark. But once they poke their heads up and show their second set of leaves (the first pair after the little round embryonic leaves known as “cotyledon”), you can move them beneath your grow lights. - Source: Internet
• I use a simple plastic container that a meal came in from a local restaurant. Your container doesn’t have to match mine. I prefer a container with a transparent lid, but the shape doesn’t really matter. The idea is to have a container that will hold humidity, and allow UV light to penetrate the top and encourage those seeds to sprout. Beyond that, be as creative or basic as you want. - Source: Internet
• 5. Add dry seeds to each rock wool or if using the moist paper towel method, transfer already germinated seeds using a clean sanitized tweezer and gently placing the germinated seed into a rock wool cube at the depth noted on your seed packet (or about the same depth as the width of the seed. Note: some seeds need to start in total darkness, some need light, some it doesn’t matter. You’ll want to check this resource here for recommendations on whether or not to cover your seed with vermiculite or not. - Source: Internet
• Hold the cover. Seed-starting kits often come with lids or plastic sheets to keep the environment humid. But covering the seeds prevents essential fresh air from reaching them and can raise the humidity to levels that invite fungi to spread. These lids may even hold in so much moisture the seeds rot before they sprout. Don’t cover your seeds with plastic! - Source: Internet
• Seeds can be started in hydroponics by simply dropping the seeds in a growing medium. Many hydroponic growers recommend using starter plugs or rockwool which will help increase the odds of seeds germinating. However, a net cup filled with expanded clay pebbles that sits in water will also work at starting seeds. The seeds cannot be floating in the water otherwise the chances of germinating are low. Seeds prefer to rest on a moist growing medium so that the seed can draw moisture in as needed through capillary action. - Source: Internet
• is a photo showing germinated seed that has been placed into Rockwool (see number one below). If you are growing in a hydroponic growing system such as a Tower Garden or Aerogarden, you’ll want to place your seed in Rockwool instead of soil. (Coco Coir is also a good alternative growing medium for hydroponics or aeroponics assuming it has support to hold material together such as in a mesh net.) - Source: Internet
• I have been blown away by the effectiveness of the seed starting method I’m going to share with you below. Don’t overthink it, it really is as simple as it looks. This has been my go-to method for germinating seeds for quite a while, and I’ve enjoyed a near 100% germination rate ever since. - Source: Internet
• Temperatures in the 68- 75 degree range are imperative. Most seeds simply won’t germinate in temperatures below 68 degrees. Temperature is more important than light for sprouting seeds. - Source: Internet
• A: To germinate seeds, you will need to place them in a jar with moistened paper towels. Place the jar on a windowsill or near a window so that it gets plenty of sunlight. After about two weeks, the seeds should have sprouted and can be planted outside. - Source: Internet
• Now, place your rockwool cubes in the water and let them soak for a half hour. This should bring the overall pH level to an even 6.0 (within .3 pH is fine) and the rockwool is now pH stable and ready. - Source: Internet
• It really is that simple to germinate seeds. I use this method to germinate all the seeds I grow in my hydroponic garden. If you decide to try this method, send me some pictures and let me know how it works for you! As always, if you have any questions please leave them in the comments or contact me here. - Source: Internet
• Heat gently. Most seeds sprout when temperatures are at least 65 degrees Fahrenheit. Raising the temperature to 75 to 80 degrees increases germination rates and speeds up their emergence. You can buy heat mats designed for seed-starting – they’re waterproof – or you can place your trays or pots where the temps are warmer (but not hot). Heat can dry out the medium, so check it often to be sure it stays consistently damp. - Source: Internet
• Sprinkle moss or meal. Growers using soil can protect their seedlings from damping off, a lethal fungal disease that rots seeds and sprouts, by sprinkling sphagnum moss or corn meal on the surface of the medium. The moss or corn meal acts as a natural fungicide, drawing excess moisture away from the thin new stems and saving your starts from the most common seed-starting problem. - Source: Internet
• Rockwool is safe. Scientific studies using magnetometric evaluation have shown that inhaled rockwool matter will not cause significant lung toxicity. The most rockwool can do is cause mild irritation to the skins and eyes when they come into contact with rockwool’s dust and coarse fibers. - Source: Internet
• Rockwool is a fantastic way to start seeds. It has an ideal ratio of water retention and aeration. It can hold moisture but can retain enough air space (at least 18%) to promote optimal root growth. - Source: Internet
• Remember the story of Goldilocks? She tried the porridge that was too hot, too cold, but settled on the one that was just right? That’s what plants are like when starting out as seedlings… the seed needs just the right temperature. Some types of plants prefer cooler temps and some plants prefer it warmer. Peppers, eggplant, melon seeds, and such prefer warmer conditions and lettuce, celery, and peas, tend to germinate best at lower temperatures. Some seeds like tobaccos, dock, and evening primrose like alternating temperatures of warm and cold to germinate. - Source: Internet
• You’ll want to check the container daily to make sure the paper towel looks damp. Don’t open the container unless the container needs to be misted. Let those seeds bask in all their humid glory for 3-5 days. - Source: Internet
• 7. Set your warming pad to 70ºF-75ºF and place your wetted rock wool + seeds = both sitting in plastic tray onto the warming pad. Then, put a bright light with red/blue light mix over your seed tray (if not starting outdoors or in a greenhouse.) - Source: Internet
• Coco Coir is simply processed dry coconut husk. Coconuts are the fruits of tropical coconut trees. These large fruits are covered by thick, protective husks that protect the seeds inside. - Source: Internet
• Rockwool is the favored growing medium in hydroponics because of its good water retention, aeration, porosity, and malleable nature. It is the recommended growing medium for both beginners and veterans alike. However, are there other alternatives, as good or even better? - Source: Internet
• Add water to the shallow tray until it is half full. Dip the rockwool cubes into the water until the bottom half of the cubes is soaked. Do not allow the water to moisten the upper half of the cubes. Squeeze the cubes to remove excess water. - Source: Internet
• Growing plants without soil is possible with the help of hydroponics. There are many different ways to do this, but one way that works well is by using rockwool. The “how to germinate seeds for hydroponics without rockwool” article will teach you how to grow your own plants without dirt. - Source: Internet
• Most seeds germinate better in the dark. (Always read the seed packet before planting.) - Source: Internet
• Now it’s time to place your seeds in the container. To do this, space the seeds out an inch or two so your roots don’t get tangled in each other. Gently press the seeds onto the paper towel. All you’re trying to do here is get the seed wet. It’s simple, put the seed in the container, push down on it, repeat. - Source: Internet
• These are the five best ways to germinate your seeds and a few tips on how to plant your seeds once they’ve rooted. Luckily, germinating seeds successfully doesn’t take a science degree. But it will take a glass of water and roughly 24 hours, so if don’t have either of those you should probably stop reading now. By following these simple ‘how to’ tips for germinating seeds, you can have an abundance of plants growing in the garden this year for minimal expense. - Source: Internet
• Tap water without nutrients is fine to start seeds. Once the seeds sprout then the plant will need to absorb nutrients from the water. At this point adding a nutrient solution to the water is necessary for the plant to continue to grow. - Source: Internet
• Place the seeds into the slots on top of the rockwood cubes. Use a toothpick or other small stick to gently push them to the bottom of the opening. Cover the seeds with perlite. - Source: Internet
• Accurate watering is easy with Rockwool Grow Cubes. Simply pour water into the tray (not on the cubes) to about 1/4" deep. Use plain water - no nutrients yet. The capillary properties of the Grow Cubes will pull moisture up to the seeds gently and evenly. At the same time, air flows through the cubes creating an even balance of air and moisture, preventing fungus and disease. - Source: Internet
• 3. Carefully sprinkle seeds over saturated cubes. Try to get the seeds to fall into the holes - don’t worry if you miss - they’ll still grow. - Source: Internet
• Tip: place seeds on a new clean wetted paper towel and give the seeds a sealed cover of some source to aid in germination. When the root emerges from the seed casing, immediately gently move with a tweezer the germinated seed into a rock wool cube at a depth the width of the seed casing. Flood the germinated seed placed in wetted rockwool with light at this point. - Source: Internet
• Growing from seeds with soil can be a delicate process. Too much water and fungus attacks. Not enough water and new tender seedlings shrivel up and die. - Source: Internet
• 4. Cover seeds with a layer of sand to protect the seed and to block out light. Any type of builders sand will work. - Source: Internet
• However - a lot of you recommend starting seeds in rockwool plugs. These plugs are transferred into larger cubes, and then into Hydroton or whatever aggregate as the medium in a typical DWC or Ebb & Flow setup. Now, I have a problem with the water retention of rockwool - there’s no way to run this continuously without waterlogging the root system. So I would like to know - is there another way of germinating seeds, at least until they are large enough to place in the Hydroton, other than RW? I have successfully germinated seeds in wet paper towels and allowed their radicle to extend a good 2"-3" before removing them for planting - are there any other ways to do this? I would like to do this without running timed cycles - something about the constant flow that I enjoy I guess. - Source: Internet
• Primarily growers use rockwool cubes as growing media for two main purposes in their hydroponics systems: germinating seeds and propagating new cuttings. Typically the 1.5” cubes are used for starting seeds or propagating cuttings. Some of the larger cubes (up to 4”) are used as a growing medium for compact plants as well, but on a much smaller scale. - Source: Internet
• We’re going to get a paper towel moist with room temperature water. You don’t want it to be dripping wet, but you want the entire paper towel to be damp. Fold the paper towel in half and then place the seeds on one half of the paper towel. - Source: Internet
• Rock wool is essentially basalt lava rock and chalk, heated to high temperatures and then spun like cotton candy into fine fibers and then pressed together into cube forms or whatever form is desired for it’s use. Rockwool is commonly used in hydroponics because it is pH neutral and the air-pockets formed in it’s creation, makes it ideal for retaining oxygen and moisture — two main things plants need in their root zone. It also has enough strength to support the plant’s root structure making it a great resource for starting seeds. [Pictured below: 2″ x 2″ cubes as a 98 cube sheet await a new planting.] - Source: Internet
• Quick note to Tower Garden Growers at this point: Vermiculite is often provided along with your Tower Garden purchase as part of the seed package. It comes in a little clear envelope. Some people say you don’t have to use it, but they don’t understand that some seeds need darkness and some need light, so be sure to refer to the handy chart I’ve provided for knowing when to cover your seeds with vermiculite and when to skip covering it at all. In case you’re wondering, Vermiculite is made from compressed dry flakes of a silicate material which is absorptive and spongy making it a great option for covering seeds keeping balance of moisture and oxygen that a seed needs. BTW, thank you Tower Garden for providing this in each order!!! - Source: Internet
• 6. Okay, you’ve done steps 1-5 above and are now ready to continue… Place your wetted rock wool with seeds sitting in a plastic tray and place onto a warming pad. (Don’t forget to label what you planted!) - Source: Internet
• Water must be available to your seed to start the quickening of respiration that leads to germination — it needs to penetrate the outer seed casing. However, few seeds will germinate if they are “drowning” in water; some air must reach the seed for the seed to germinate. The oxygen taken in by the seed through respiration combines chemically with the seed’s fats and sugars and is referred to as oxidation. That being said, you want to pre-soak your rock wool and then let excess water drain off. You should never let your rock wool sit in water and remain water logged. - Source: Internet
• Now that you have the seeds situated in the container, hit them with a nice mist of water. Simply wet the seeds. If you end up with standing water, drain it out. - Source: Internet

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