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How To Start Seeds In Rockwool. Best 3-Step Guide

If you want to learn how to start seeds in Rockwool, you have three steps to understand. Rockwool is a popular growing medium, especially for hydroponics. Therefore, it’s not surprising that one wants to know how to use it to their advantage in germinating seeds. 

In addition to starting seeds in the greenhouse to encourage germination, using Rockwool as the medium for them can be useful because of its excellent moisture retention. Remember that one of the factors that one must nail to ensure sprouting is providing moisture without overwatering that can dampen and kill the seeds. Rockwool will not create a waterlogged environment for the seeds, but it won’t dry them as well. 


How To Start Seeds In Rockwool. Best 3-Step Guide

How To Start Seeds In Rockwool Successfully


Step #1. Preparation

Being a soil-less growing media, you can expect to prepare the Rockwool cubes first before sowing the seeds in them. For example, it’s worth noting that this media has a pH of around 7 to 8, which is high for seeds. You can adjust the cubes’ pH levels by soaking them in water, and this should result in a level between 5.5 to 6.5, which is more appropriate for seed germination. 

Use slightly acidic water to do so, or make one using water and lemon juice. A solution around 5.5 to 6.5 pH would be ideal, and you can use a pH test strip to achieve this. Once you have the slightly acidic water, soak the cubes in it for at least an hour. 


Step #2. Planting

After an hour, you can use the cubes and plant the seeds at their top and pinch the hole close. You should find the hole and place two seeds inside or use an object to comfortably press the seeds down to the bottom of this hole. After planting, add more moisture using a hydroponic nutrient solution to encourage germination and transplant once you have 3-inch tall seedlings. 


Step #3. Maintenance

As mentioned earlier, the main advantage of starting seeds in Rockwool is that it provides moisture at the ideal rate. Without the danger of drying or overwatering, the water should promote germination by activating the seed’s enzymatic reaction. However, you still need to do the necessary maintenance practices to ensure success. 


Encourage germination

For example, the greenhouse is a suitable environment for hydroponic systems because you can control the internal conditions. This is especially useful for starting plants that are more challenging because they haven’t established themselves yet. Those who start seeds in Rockwall cubes can place them somewhere between 70 to 80°F and inside a humidity dome to create an ideal sprouting environment. 


Encourage seedling development

The maintenance practices at this point involve misting when the cubes start to dry out. Be mindful not to overwater the cubes or accidentally allowing it to dry out. Once you notice sprouting, depending on the plants you’re growing, remove the dome and place the cubes under grow lights to support development further. 

Much like in starting seeds in pots, you want to thin the plants so that only the healthiest remains per cube. This could also be the taller plant, and you can cut off the shorter one. You don’t need to pull out the undesirable plant because you run the risk of dislodging the preferred one at the cube. 


How To Transplant From Hydroponics To Soil

Starting seeds in a soil-less medium and transplanting the plant to soil is common among growers. However, you have to be mindful of this practice to avoid transplant shock and other potential problems. For example, where should you plant the transplants?


Transplant preparation before soil planting

You can use a large pot to anticipate the root system of the transplants. Allocate a space of around 4 inches to ensure that they have room for their roots. Fill this with a growing medium like a soil-less peat mixture.

This will act as an environment for the plants before being directly in the soil. After planting, you must add a nutrient solution to help the plants adjust. It’s also vital to water them immediately to reduce the risk of shock. 

Wait for a week to cut back on watering and check your calendar if you can transplant outdoors. 


Hardening and transplant shock

More so, don’t forget the importance of hardening the plants gently before permanently planting them outside. If you notice withering of leaves and stems, this can be a sign of transplant shock. You can water the plants to help them and trim it to at least one third to strengthen their roots. 



With extensive knowledge of various mediums, one shouldn’t feel intimidated by growing plants from seeds. If you know how to start seeds in Rockwool and have a greenhouse, you don’t risk encountering common germination drawbacks from low moisture availability and unstable environments. The key is preparing the cubes first by adjusting their pH level and placing them in the greenhouse to encourage sprouting further. 

Much like growing seeds in other mediums, you must maintain soil moisture by misting and using a humidity dome. You can also adjust the temperature in the greenhouse and wait for seedlings to develop. At this point, wait for the plants to reach an ideal height for transplanting, and you should have vigorous plants from Rockwool. 


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How to Harvest Marigold Flowers and Seeds: Tools And Tips

How to Harvest Marigold Flowers and Seeds: Tools And Tips

Want to know how to harvest marigold flowers and seeds? Marigold flowers are a mainstay in most of the gardens. They bloom beautiful flowers all season long and they’re easy to grow from seed. Knowing how to save marigold seeds is essential if you want to continue growing them the next season.

Fortunately, harvesting marigold seeds are quite quick and easy. You only need to take the seeds from the flowers and let them air dry before storing them during the winter season. You can pack it up with a container or seed packets to save even more for the next growing season. Some of the marigold flowers are edible and best to mix in your salads to add a distinct flavor to it.


Tools You’ll Need to Harvest Marigold Flowers

The tools you’ll need to harvest marigold flowers include a basket or other available containers that can be used in harvesting flowers. You’ll also need some paper towels, a sharp knife, a pair of scissors, or gardening shears.

Since you need to evaluate or describe the process, get yourself some notes. Seed packets can be envelopes or closed-air containers excluding plastic containers and bags.


How to Harvest Marigold Flowers and Seeds

Here’s how you can harvest marigold plants for flower arrangements and bouquets:


Letting Marigold Flowers Dry

It’s important to wait until the right time to collect marigold seeds. You can harvest the seeds when the petals are dry already (when the base of each flower turning brownish). However, make sure there’s still is a bit of green color left in the base of the bloom. If you also wait until it is completely turned brown, it may start to rot or mold. It’s important to wait for the perfect time to harvest marigolds since the timing is crucial to have the right quality of marigold seeds.

Tip in harvesting: While you are harvesting, simply cut each marigold flower heads using your cutting equipment or either pinch it with your finger. However, be sure not to pull the flowers as it can harm the roots of your marigolds.


Opening the Marigold

Get your paper towel and set it on a flat surface. After, hold each bloom’s base, pull-off, and discard the petals and leaves of it. Then, you will easily notice the attached seeds inside the base. In the meantime, set the prepared blooms on your paper towels for bulk removal of seeds. You may also use larger towels to manage and accommodate the abundant blooms of your marigolds.


Removal of Marigold Seeds

Marigold seeds are likely to have a long, slender, and pointed appearance. Divided ends with black color and white color on the opposite edge. Gather your blooms, pull-off all petals, and leaves, and start pulling the seeds from the base. After getting all marigold seeds, discard the base in a single place like in bins or garbage bags. After sorting, put another paper towel on another flat surface and spread the pulled marigold seeds on it.


Drying of Seeds

As mentioned above, let your marigold seeds air dry for about a week in an uncovered paper towel. It will enable them to be preserved even in frost season and will prevent it from getting rot and mold.


Seed Storing

After drying the seeds, gather them and start placing them inside your seed packets to prolong their lifespan and will still be used after the frost date. Do not use plastic bags in storing your marigold seeds because it will retain residual moisture, which will affect your marigold seeds and even get rot and mold. To avoid forgetting about your marigold seeds, put a label on it to prevent possible disposal if unlabeled.


Using Stored Seeds for Replanting

After storing your collected marigold seeds, it is perfect to plant during the growing season. You can enjoy once again the benefits of it from house beautification to an edible ingredient for your salad.


Facts about Marigold Flowers

Marigolds are especially good for repelling insects and pests, making them companion plant for tomatoes, eggplants, tomatoes, and chili pepper because of its pungent scent of some variety. It is amazing having this kind of flow in your plant, imagine you don’t only have a beautiful attractive garden but having also a very natural insect and pest repellent that will protect your plants from any abrogation.

African marigolds have larger flower heads on plants that grow from 10 to 36 inches tall. While French marigolds are smaller and bushier, having only two inches of flower head across on plants and only having six to eighteen inches height. Sizes and colors vary on its classification, having a mixed combination is pretty great, will also add more pleasant and abundant color to your garden.


The Benefits of Growing Marigolds in a Greenhouse

Have you ever thought of growing your marigolds in a greenhouse? If you haven’t, it’s time to consider getting a greenhouse.

Greenhouses are great for keeping your marigolds safe from pests and diseases. Marigolds are susceptible to insects and blight, such as caterpillars, aphids, leaf spots, and mildews. You can lower the risk of plant damage by growing your marigolds in a greenhouse.

Additionally, greenhouses can also keep your plants safe from bad weather that could easily damage your flowers.


Final Thoughts on How to Harvest Marigold Flowers and Seeds

Knowing how to harvest marigold flowers and seeds is crucial if you’re planning to plant them in your garden. These beautiful flowers that usually come in yellow and orange colors are a great addition to any garden or flower arrangement.

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