Worm Castings vs. Miracle Gro: Which One Is Better? (2024)

Growing and taking care of plants is part of home improvement. While searching the internet for the best fertilizers, you might find a few different examples, such as feather and kelp meal. Worm castings and Miracle Gro are two honorable mentions promoting abundant plant growth and rich nutrient absorption. However, which fertilizer will you use in keeping nutrients in your potted plant or garden beds? Read on to learn more about worm castings vs. Miracle Gro.

Difference Between Worm Castings and Miracle Gro

Both are excellent plant food and good for overall soil health. You can use worm castings directly on topsoil, potting soil, or in the potting mix while gardening. Add earthworms along with your compost bin or worm farm. After the worms feed on the compost, they digest it and excrete worm casting, making a fine soil mix rich in nutrients.

Meanwhile, you have to dilute Miracle Gro in your watering can before using it on your plants or you risk burning them. The bottom line is you can use worm castings straight on the ground; get worm casting from your worm bin and apply it. With Miracle Gro, you have to follow specific procedures before using it to water your plants.

Worm Castings vs. Miracle Gro: Which One Is Better? (1)

Are Worm Castings Better Than Fertilizer?

Based on our investigation, our verdict goes to worm castings. Unlike chemical fertilizers, worm castings provide organic nutrients for indoor plants and outdoor plants. Worm castings are another term for earthworm manure, and it contains good bacteria that convert organic matter into a form that plants can benefit from. Also, worm castings contain enzymes suitable for all plants, including vegetables. Moreover, using worm castings can prevent the development of plant diseases. Additionally, worm castings will not burn your plants, unlike chemical fertilizers.

Are Worm Castings a Complete Fertilizer?

Worm castings contain nitrates, calcium, phosphorus, potassium, iron, nitrogen, and other minerals and nutrients. Also, you can apply and mix worm castings on your potted plants, hanging baskets, and containers. Unlike regular composting, it does not take up much space and is suitable for potting soil. Vermicompost is a mix of worm castings and other biodegradable materials, and it should not be confused with regular compost. A little goes a long way for vermicompost because you do not need large amounts of worm castings for your potted and container plants. All you have to do is mix it with the potting soil and go about your gardening chores as usual. You get a pack of high-nutrient organic fertilizer on your potted plants. Plus, these organic nutrients make your plants grow strong and improve their roots.

Disadvantages of Worm Castings

None, worm castings have no disadvantage. Worm castings are excellent for garden or potted plants. If you consider planting in container gardens or hanging baskets due to lack of space, you could also add worm castings in the potting soil. They are also suitable for young seedlings because they promote plant growth.

Does Miracle Gro Have Worm Castings?

Yes, Miracle Gro does contain worm castings. Mixing the fertilizer with water allows gardeners ease of use and low maintenance work. They have various products ideal for trees, shrubs, and vegetables. Also, they have a specific product for potting mix.

How to Use Worm Castings

There are sellers in the market that offer ready-made earthworm castings. However, if you want to make one yourself, start gathering all the needed materials. You will need to find two containers of your preferred size, stack them on top of the other with a wedge, and then add your compost. You can use shredded newspaper or coconut coir for aeration. Please do not use too much kitchen waste as it will over-ferment. Lastly, add the worms to your bin. Ideally, people that vermicompost don’t use earthworms that you would find outdoors. Rather, they prefer to use special composting worms. Once you’ve gathered enough worm castings, add them to your potting soil at an optimal ratio.

Make Worm Casting Tea

Worm casting can also be a liquid fertilizer. To do this, make a worm casting tea like how you make a regular tea. Use an old t-shirt, pantyhose, or cloth, put your worm castings inside, and steep it overnight. Water your plants before adding the tea so the microbes will not die.

Worm Castings vs. Miracle Gro: Which One Is Better? (2)

Benefits of Worm Castings

Since their texture is like coffee grounds (coarse yet reminiscent of humus), it assures that your plants will have good soil structure because of the optimal soil aeration that plant roots need. Also, worm castings promote water retention. Most of the time, when you water the plants, nutrients wash away, worm castings prevent erosion of nutrients from happening. Due to this, worm castings fall under the slow-release fertilizer category.

NPK Explained

In studying fertilizers and plants, you may come across a term called NPK ratio. It stands for Nitrogen-Phosphorus-Potassium. Worm castings are completely organic which have no negative effects on your plants while keeping overall plant health. Plants need organic material, and each of them has a different ratio for overall plant health. Nitrogen is good for leaves, phosphorus is good for plant roots, and potassium is for overall plant health. Worm castings have a 5-5-3 ratio, meaning five percent nitrogen, five percent phosphorus, and three percent potassium.

Conclusion

The fertilizer you use should be the most suitable for your overall plant health. We highly recommend worm castings from worms fed a pesticide-free diet of organic matter. If you plan to collect your own worm castings at home by vermicomposting, you’ll know exactly what your worms have eaten. Thus, you won’t have to worry about your worm castings containing certain pesticides or other harmful substances. When comparing worm castings vs. Miracle Gro, worm castings are the right fertilizer choice as they promote better plant growth. Miracle Gro could burn your plants if not used properly. We hope we have helped you decide which fertilizer is best and wish you good luck in your newest gardening venture!

Worm Castings vs. Miracle Gro: Which One Is Better? (2024)

FAQs

Worm Castings vs. Miracle Gro: Which One Is Better? ›

Thus, you won't have to worry about your worm castings containing certain pesticides or other harmful substances. When comparing worm castings vs. Miracle Gro, worm castings are the right fertilizer choice as they promote better plant growth.

What are the disadvantages of worm castings? ›

Worm castings offer significant health benefits for the lawn's soil, but worm castings have drawbacks when they take over the yard.
  • A yard with too many worm castings can look unkempt and ruined with a lumpy and uneven feel.
  • Worm castings can make lawn mowing difficult and even dull the mower blades.
Nov 6, 2023

Can you use Miracle-Gro with worm castings? ›

Soil and Plant Food for Raised Bed Gardens

Start by filling your raised beds with Miracle-Gro® Raised Bed Soil, a no-mix soil blend that's completely organic and ready to use. It's packed with natural materials like earthworm castings, kelp meal, bone meal, and more to create a fertile foundation for your plants.

Are worm castings better than fertilizer? ›

The benefits fertilizers give to plants are abundant, but worm castings have more advantages, organic matter, and nutrients. It's safe to say worm casting is the best fertilizer with how nutrient-dense the soil becomes when castings mix with soil.

What is a good alternative to worm castings? ›

If the thought of handling worm poop makes you squirm, you could instead try kelp as a fertilizer for your garden. Kelp is a type of algae. They are similar to seaweed and grow abundantly in the ocean. This makes them a highly sustainable source of fertilizer.

Should I mix worm castings with soil? ›

Add finished organic worm castings to a pile of tired and depleted soil and watch it come to life again. In a matter of weeks, the microbes in worm castings will have done their magic—repopulating the soil, breaking down the organic materials, and reestablishing that sad dirt into valuable organic living soil.

What to use instead of Miracle-Gro? ›

A good soil management program would start with an organic fertilizer, such as Neptune's Harvest Fish Emulsion or Fish-Seaweed Blend. These products are complete fertilizers.

Is too much worm castings bad for plants? ›

Worm castings are like the black gold of the agriculture industry as they provide endless benefits without the harmful toxins and pesticides that fertilizers have. With that being said, unlike chemical fertilizers, worm castings won't harm your plants regardless of how much you add.

Are there worm eggs in worm castings? ›

The cocoons in Worm Castings each contain between 2 and 10 eggs that hatch within 2 weeks. This means that the process of decomposition are continued by the young earthworms in the soil, provided that the soil is loose, damp, and rich enough in organic matter for the worms to stay alive.

How long does it take for worm castings to work? ›

It will take your worms 6-8 weeks to produce a noticeable amount of vermicompost. The castings appear as small, dark, clumps that easily break apart. There are several methods for removing the finished compost: Every 3-4 months, stop feeding for a few weeks and rake the compost to one side of the bin.

Can you overdo worm castings? ›

Because worm castings are just digested organic matter, there's no way they can “burn” your plants. The concept of burning plants came into existence with the emergence of synthetic fertilizers. Luckily with organic gardening, there's very few risks of overdoing it.

How long is a bag of worm castings good for? ›

Worm castings last up to six months or more when properly stored. Bagged castings sold at retail garden centers typically come in a resealable bag. The bag helps to maintain the moisture of the castings, which in turn keeps the microorganisms contained within it alive and active.

Do worm castings attract bugs? ›

Worm castings will not attract many insects, but if the soil is too wet or too dry, then bugs may come to visit your plants. Therefore, when using worm castings as fertilizer, it's vital that water them in before adding any other type of fertilizer because this will ensure good drainage and better results!

Do worm castings prevent bugs? ›

When used properly, castings act as a natural insect repellant. Bad bugs feeding on leaves of those plants will absorb the enzyme, causing its exoskeleton to dissolve and die. The worm tea can also help fend off pests when sprayed on plants.

Which is better, mushroom compost or worm castings? ›

To summarize, both products are a good supply of organic matter. Plants grown in good soil-applied to either of these products are healthy. However, to answer the question of mushroom compost vs worm castings, mushroom compost is the best choice due to its less time-consuming nature.

Do bagged worm castings go bad? ›

While vermicompost can be stored for as long as three years, it is best to use it as soon as possible, because the bacteria in it slowly consume the organic matter within. So, it has a shelf life of up to three years, but by the end of that time period, you may have vermicompost that's largely useless.

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