How To Make Homemade Seed Starting Soil - Create Perfect Soil To Grow Great Plants! (2024)

One of the best ways to grow healthy, strong plants from seed is to start them in loose, healthy and fertile soil – and there is no better way to do that than to make your own incredible homemade seed starting soil right at home!

Growing your own transplants from seed is one of the best ways to save money when gardening. Even better, it gives you the opportunity to grow all kinds of amazing plants you can’t find locally. After all, most nurseries and plant stores are only going to carry the most popular of plants.

But perhaps best of all, growing your own plants from seed lets you create incredibly strong and healthy transplants that are ready to grow like crazy when you plant them outdoors. And that process all begins with planting your seeds in the best soil possible.

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Giving Your Seeds The Best Soil To Germinate & Grow

One of the biggest mistakes gardeners make when trying to start plants indoors is to use the wrong soil. Top soil or soil from the garden are both too dense and heavy for good germination. These heavier soils don’t allow seeds or seedlings to easily absorb nutrients. They also usually hold too much water, making it easy for seeds to rot before they ever germinate.

Unfortunately, potting soil isn’t the best solution either. Although potting soil contains more nutrients and is definitely lighter than regular garden dirt and topsoil, it still isn’t light enough for starting and growing seedlings. Nor does it contain the best power to promote early seed growth.

The good news is that potting soil’s lighter structure and density are a great starting point for creating an excellent homemade seed starting soil. And by simply adding just a few additional ingredients to potting soil, you can easily turn it into an incredible homemade seed starting soil. One that is ideal for quick germination – and healthy fast root growth!

How To Make The Perfect Homemade Seed Starting Soil

Although there are a few good seed starting soil mixes available commercially, they can be quite pricey. But by mixing together a good potting soil mix with 3 additional all-natural ingredients, you can make the best seed starting soil around – and for far less!

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Even better, not only will making your own mix save you a bit of cash compared to store bought brands, it also allows you to create a 100% organic mix. That, of course, can be a great peace of mind when growing vegetable plants from seed.

With growing success in mind, here is a look at the 4 special ingredients needed to make perfect seed starting soil – and how to mix them together to get your seeds off to an incredible start!

#1) Potting Soil – How To Make Homemade Seed Starting Soil

A great seed starting soil all starts with potting soil. Potting soil is the perfect base for creating a rich, healthy seed starting soil mix.

Start by selecting a good all-purpose potting soil. Be sure that it does not include any fertilizers in the mix. Strong fertilizers can actually hurt young seedlings more than help. Young seedlings require a lighter, slow-release fertilizer to allow for even growth.

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If too much fertilizer is present, at best, it will lead to plants with excessive early foliage growth but weak stems. Unfortunately, too much fertilizer is more likely to be fatal to young seedlings.

#2) Perlite – How To Make Homemade Seed Starting Soil

Perlite is an all-natural substance made from volcanic glass. When exposed to extremely high temperatures (1500+ degrees), perlite puffs into an airy, lightweight substance that looks quite similar to bits of white styrofoam. And it happens to be a perfect ingredient for making great seed starting soil!

Perlite lightens the soil weight tremendously, all while creating air channels in the soil for water and air. Both of these qualities are vital to strong seedling growth. It is exactly why you will see perlite as an ingredient in many potting soils as well.

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Perlite never breaks down, so it keeps the soil from compacting together permanently. Once you purchase a bag of perlite, it will stay good forever. And once it’s in the ground, it will also help forever as well! Affiliate Product Link : Espoma Perlite 8 qt. Bag

#3) Compost – How To Make Homemade Seed Starting Soil

Whenever you want to add loose, lightweight and fertile power to any soil, compost is the answer! It not only helps to lighten a homemade seed starting soil mix, it also improves the overall drainage of the soil as well.

Compost is overflowing with nutrients that are easily absorbed by tender roots. Even better, those nutrients are not overly strong, so they won’t overpower young seedlings. In addition, compost can hold in excess of 10 times its weight in moisture – which means it can help seedlings get the moisture they need to sprout and grow.

When adding compost to your seed starting mix, it’s important to use use ultra-fine compost. If using compost from your home pile, screen it first to remove any large chunks that may have not fully broken down yet.

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This is one time where picking up a bag of compost can be helpful. Most commercial bags of compost have already been screened and are quite fine. Affiliate Link: Charlies Compost 10 Lb. Bag

#4) Worm Castings – How To Make Homemade Seed Starting Soil

The 4th and final ingredient to add to your mix is worm castings. Worm castings, which are the manure of worms, are the true hero of a perfect seed starting mix.

The light makeup of the castings helps to break up and lighten soil much like perlite – but with one big difference – worm castings are filled with loads of trace minerals and nutrients that can easily and quickly be absorbed by seedlings to power them up.

These nutrients slowly release over time and leach into the soil as they break down. Just like compost, worm castings also act as the ultimate slow-release fertilizer for young seedlings.

Although you could use just compost, perlite, and potting soil, worm castings take homemade potting soil to another level. One that will have your plants strong and healthy come transplant day! Product Link : 100% Pure Worm Castings

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Creating The Mix – How To Make Homemade Seed Starting Soil

The best part of all in creating your own seed starting soil is how easy it is to mix together. To make, simply combine equal parts of each of the four ingredients above. It is usually best to premix all four in a large wheelbarrow or 5-gallon bucket and then fill your seed trays.

For best results, always water down your soil in the trays a few days prior to seed planting day. This will help to provide good moisture in the soil for better germination. It also allows the soil to settle in the containers, giving you time to top it off before planting seeds.

For more great information on starting seeds and how to provide them the right lighting for success, be sure to check out our article:

Make this the year you create your own seed starting mix and grow your best plants ever!

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How To Make Homemade Seed Starting Soil - Create Perfect Soil To Grow Great Plants! (2024)

FAQs

How To Make Homemade Seed Starting Soil - Create Perfect Soil To Grow Great Plants!? ›

For an amazingly fertile seed starting mix, we use this simple formula : 1 cup of potting soil, 1 cup of fine compost, 1 cup of worm castings and 1 cup of perlite. It really is that simple.

How to make incredible seed starting soil? ›

For an amazingly fertile seed starting mix, we use this simple formula : 1 cup of potting soil, 1 cup of fine compost, 1 cup of worm castings and 1 cup of perlite. It really is that simple.

How do I make the best soil for seedlings? ›

Mix equal parts of coco coir, perlite and vermiculite. Use hands or large spoon or shovel to mix until mediums are combined. Fill pots and begin to seed! Gently spray or water the surface of soil-less mixture to set seeds.

What is the best mix for starting seeds? ›

Combine compost, topsoil, a bit of coarse sand, and something like vermiculite, perlite, or coco coir until you have a mix with a consistency that holds together when wet. For seed starting, you'll avoid using as much sand as you would when making soil for your garden.

Should I put worm castings in my seed starting mix? ›

Once you add our worm castings to your seed starting mix, you'll see how easy it is to start seeds all on your own. It's also worth noting that adding worm castings to your starting mix can be hugely beneficial when starting plants from cuttings (or slips).

How long should seeds be soaked in water before starting in soil mix? ›

Examples of seeds that benefit from soaking include peas, beets, cucumber, corn, squash, pumpkin and beans. In a bowl, cover your seeds with warm water and leave to soak for 6-24 hours. Smaller seeds and those with thinner coats need the shorter time, and larger seeds with thicker coats need the longer period.

Should I add compost to my seed starting soil? ›

In addition to hearing individual gardeners recommend against starting vegetable seeds in compost, two books that I like both recommend starting seeds in mixes that do not include compost.

How long can seedlings stay in seed starting mix? ›

As a general guide, after your seeds germinate they can grow in smaller (1.5″ cell trays) for about 2-3 weeks, in larger 2″ trays they can grow in them for about 3-4 weeks before needing to be transplanted.

How do you make seedlings strong roots? ›

For plant roots to grow faster, it requires nutrients, sufficient water, well-aerated soil, enough light, the right range of temperature and proper amendments. Nitrogen, phosphorus and potassium are the three essential nutrients that a plant requires for its growth.

Does seed starting mix need fertilizer? ›

Although some seed starting mixes have fertilizers in them, fertilizers are not necessary for seed germinating.

What is seed starter soil made of? ›

According to Michigan State University Extension, there is a difference between potting soil and seed-starting mix. Soilless seed-starting mixes have a finer texture and are made from ingredients such as milled peat moss, perlite, coconut coir fiber and vermiculite.

What seeds should not be soaked before planting? ›

By soaking the seed, it enables the new growth from the inside to push through the hard shell and grow. The seeds that could benefit from a good soaking include: corn, pumpkin, beans, chard, beets, and peas. The seeds you shouldn't soak include: carrots, lettuce, radish, celery, turnips, and spinach.

Can I use Miracle-Gro potting soil to start seeds? ›

Help seeds germinate by sowing them in Miracle-Gro® Seed Starting Potting Mix. This is finer than a regular potting mix, so young roots have an easier time of poking through. It mostly contains lightweight peat moss—a texture that allows air to move through while retaining a uniform amount of moisture.

Do you have to use special soil to start seeds? ›

When first germinating your seeds, your tender seeds sprout delicate small roots that have a hard time fighting their way through dense soil. They thrive in the fluffy and light soil of a seed starter mix because that is where they have the best luck pushing their fine roots through.

How much worm castings to add to seed starting mix? ›

Some add as much as 50 percent compost or worm castings, while others go much lower. The mix I have made in the past that has worked very well for seed starting includes 20 percent worm castings. Generally, the peat/coir and perlite/vermiculite are equal parts of the remainder of the mix.

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