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.

How To Make Homemade Seed Starting Soil - Create Perfect Soil To Grow Great Plants! (1)
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!? ›

The Jiffy Seed Starting Mix is an ideal option for gardeners looking to give their plants the best possible start. This specifically-formulated soil mix replicates greenhouse conditions, giving the seeds a better chance of germinating quickly and effectively. Peat moss, vermiculite, and lime are included in the mix.

How to make your own seed starting soil mix? ›

Instructions
  1. Mix equal parts of coco coir, perlite and vermiculite.
  2. Add handful of worm castings, if using.
  3. Use hands or large spoon or shovel to mix until mediums are combined.
  4. Wet only until you can form a loose ball (water should not be dripping from compact mixture)
  5. Fill pots and begin to seed!
Jan 12, 2023

What is the best soil for seed starters? ›

The Jiffy Seed Starting Mix is an ideal option for gardeners looking to give their plants the best possible start. This specifically-formulated soil mix replicates greenhouse conditions, giving the seeds a better chance of germinating quickly and effectively. Peat moss, vermiculite, and lime are included in the mix.

Can I use seed starting mix as potting soil? ›

Q: Can I use seed starting mix instead of potting soil? A: Seed starting mix is optimized to help seeds germinate and generally doesn't contain much, if any, nutrient value. It's meant to be ideal for germination, but not great for growing stuff later.

How to prepare soil for seedlings? ›

How to Prepare a Garden Bed and Plant Seeds
  1. Break ground. Use a digging fork (or potato fork or broad fork) to loosen the soil and pull weeds from the bed. ...
  2. Add Manure or Compost. ...
  3. Shape & smooth Planting Bed. ...
  4. plant seeds. ...
  5. Water & Wait.
Apr 17, 2024

How do you make your own soil mix? ›

Making Soil-based Potting Media
  1. Start with one gallon of sterilized loam soil, commonly called garden soil and sold at garden centers, and pour it into a clean, empty bushel basket. ...
  2. Add one gallon of moist, coarse sphagnum peat moss, followed by one gallon of coarse sand, perlite, or vermiculite.
Mar 14, 2023

What is the seed starting mix for soil blocker? ›

The following recipe makes approximately 2 bushels of mix.
  1. 3 buckets brown peat (standard peat moss).
  2. ½ cup lime. ...
  3. 2 buckets coarse sand or perlite.
  4. 3 cups base fertilizer (equal parts blood meal, colloidal phosphate, and greensand). ...
  5. 1 bucket garden soil.
  6. 2 buckets well-decomposed compost.

What is the best fertilizer for seed starters? ›

What Type of Fertilizer to Use on Seedlings. Look for an all-purpose fertilizer that contains an even balance of nitrogen (N) to phophorous (P) to potassium (K). An all-purpose fertilizer will help young plants develop a sturdy root system and lush, healthy leaves.

What compost is best for starting seeds? ›

For sowing seeds and rooting cuttings, use specific seed and cuttings peat-free compost. These are milled to a fine texture, which is especially important for smaller seeds.

How wet should seed starter soil be? ›

For seeds to germinate, you need to keep the growing soil damp but not too wet. Learning how to water seedlings is pivotal for success. Many seed starters cover the container to keep soil moist until seeds germinate. Once seeds sprout, do not miss a watering.

How to add nutrients to seed starting mix? ›

Add Compost: Mix in compost, coco coir, or worm castings to provide additional nutrients for seedlings. Aim to add about 20-30% compost by volume. Combine Thoroughly: Thoroughly mix the ingredients until well blended. Break up any clumps and ensure an even distribution of materials.

Is Miracle Gro potting mix good for starting 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.

Can egg cartons be used to start seeds? ›

Seeds can grow in just about anything that holds soil and allows for proper drainage. Using cardboard egg cartons is a great option because they are biodegradable, and you likely have a carton already in your fridge.

What is the best soil mix for germinating 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.

How to turn bad soil into good soil? ›

Transform dead dirt into healthy soil using these tried-and-true methods.
  1. Stop using NPK fertilizers. ...
  2. Stop using herbicides. ...
  3. Leave the leaves. ...
  4. Be mindful of disturbing the soil. ...
  5. Use wood chips. ...
  6. Use compost. ...
  7. Stop spraying for mosquitos.

How to make your own seed starter tray? ›

Clamshell containers, especially those with a clear lid, can make great planting trays for seedlings. Simply punch a few holes in the bottom for drainage, fill with soil, plant the seeds, and use the clear lid as a mini-greenhouse until the seedlings have emerged.

How to make propagation mix? ›

The growing medium – Generally a good cutting propagation mix for cuttings has higher aeration than normal and this can be provided by mixing a general purpose potting mix 50/50 with a coarse material such as perlite or coarse washed river sand or even polystyrene foam beads.

Is it cheaper to make your own potting soil? ›

Before we go any further, note that if you only need a few small containers' worth of potting mix, you may actually be better off buying a pre-made mix! Making your own is usually only economical on a large scale.

Can you put seeds straight into soil? ›

Planting seeds this way is called direct sowing, and it is an easy process that yields great results. Unlike indoor seed starting, direct sowing involves unpredictable elements: weather, wildlife and insects. Even so, many vegetables, annuals, herbs and perennials sprout easily from seed sown directly into garden soil.

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