The Ultimate Seed Starting Guide - Garden Therapy (2024)

In this guide, you’ll discover how to start seeds inside and start your garden early this year. I’ll cover everything from the best seed starting trays to what seed starting mix to get.

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If you are hoping to sow seeds early in the season and start your garden truly from scratch, then you’re in the right place! I have put together a guide covering the many essential posts from the Garden Therapy Seed Starting Series.

You will find all the information you need in this seed starting guide to grow a vegetable, herb, or flower garden entirely on your own. From the basics for beginners to helpful tips and tricks for seasoned gardeners, you will be able to start your garden inside or out, with DIY containers or by using some highly-recommended equipment. Whichever you choose, I’ll show you how to start from seed organically and without harmful chemicals.

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What Are The Benefits of Starting Seeds Indoors?

There are several reasons why people like to start seeds indoors. For starters, they cost less. You can use containers that are repurposed or upcycled.

Another reason people love starting their own seeds is you can literally start any seed you want indoors, as long as you pay attention to timing. When you are limited to the plants your local greenhouse is selling, you have fewer options.

When you start your own seeds, you control the water, the sunlight, and the potting mix. This gives you more control over your plants and could mean you’ll get healthier plants.

When Should I Start Seeds?

The Farmer’s Almanac has a really handy table that lists when to start seeds indoors based on where you live. If I had to boil it down to one simple catch-all rule, you want to plant annual vegetables about 6 weeks before the last frost in your area.

Be careful not to start your seeds too early. It’s better to be late than early, as the frost will kill them.

How To Start Seeds – Your Complete Guide

I’m certainly one who is passionate about my little seedlings, as most gardeners are! There’s something so exciting about watching that little bit of green shoot up from the soil. Throughout my time as a gardener, I’ve experimented with a lot of seed starting methods. The list below envelopes everything you could possibly need to know about growing plants from seeds.

Click around and enjoy growing your baby seedlings.

Seed Starting 101

Of course, the best place to start is at the beginning withSeed Starting 101. This basic seed starting guide covers how to choose and plant your seeds, as well as information on containers, soil, light, water, and more. Read the entire starting guide here.

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How To Start Root Vegetables

As the name implies, root vegetables include any veggie that grows under the ground. This includes carrots, radishes, potatoes, and onions. While root vegetables are some of my favorite items to harvest, there are a few things you should know before you start these seeds. Read all my tips for growing root vegetables here.

How To Start Seeds for Heat-Loving Plants

There is an entire section of plants called heat-lovers because they thrive in the warm sunshine – tomatoes, peppers, and eggplants are a few of this sun-loving bunch.

For these plants, the soil temperature is critical. If it isn’t warm enough, the seeds won’t germinate. Read all my tips for starting seeds for heat-loving plants here.

Seed Starting Trays

Probably one of the most important parts of starting seeds is choosing the right container. It needs to be something that the seed will grow in, of course. But, it also needs to be in a vessel you can transplant and get into the ground the rightway.

Seed Starting Containers for the Crafty Gardener

Do cute Pinterest seed-starting containers really work? Honestly, some work better than others, and some don’t work very well at all. I put them all to the test inSeed Starting Containers: The Real Dirt – Part 1. Do toilet paper rolls and egg cartons really make good seed starting containers? All will be revealed in this post.

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Seed Starting Containers You Can Buy

If you aren’t feeling all that crafty, then how about the store-bought containers? The exposé continues with Seed Starting Containers: The Real Dirt – Part 2where you’ll find out if those eco-pots are really worth the high prices and whether peat pellets grow good tomato seedlings.

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Seed Starting Mix

One of the most important yet under planned for parts of growing from seed is to use the proper potting mix. Here’s what you need to know about the best soil for your seedlings.

Use a Soil Block

First of all, I want to introduce you to one of my gardening must-have tools…the humble (amazing!) soil block. This allows you to create your ideal soil mix, then turn it into housing for your seedling, completely container free. This way can save you money and it makes replanting them so much easier too. Read about the easy and economical soil blocks here.

The Best Potting Soil

When you are starting your seeds, keep in mind that you will be replanting them outside afterward. You should pick a potting soil that is Peat-free, as it’s good for the environment and your seedlings. Read about the best potting soils here.

Make Your Own Soil With Composting

Composting is an eco-friendly way to make rich soil for your plants. It can save you money and will cut down on waste. Read all about composting and how to do it here.

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Check Soil pH

Having soil that is too acidic or not acidic enough is both a problem for your growing seeds. Thankfully, it’s pretty simple to do a soil pH test right at home. All you need is some white vinegar, water, and baking soda. This can even be a fun science experiment with your kids. Learn how to check the soil pH at home here.

Other Seed Starting Supplies

What do you need to have before you start your seeds? A greenhouse and a good shelf are essential. You already know what soil and containers you’ll need. Now let’s look at a few other essential things too.

A Grow Light Shelf

Once you have these beautiful little seedlings starting to sprout, what then? It’s time to build them a nice warm and bright home so they can grow up big and strong. ThisGrow Light Shelving for Seed Starting Indoorsis an essential part of successful seed starting as it prevents coldspringtemperatures and short daylight hours from stunting your new seedlings’ growth. Once the warmer weather hits, your little babies will be so advanced that your gardening season will begin in full swing.

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Outdoor Seed Starting in Mini Greenhouses

You could also want to start seeds outdoors with someMini Greenhouses. These are a staple in my early spring garden and you will soon see why!

Now you are armed with all the information you could possibly require about how to give your seeds the best start possible. What tips would you add to the mix?

More Gardening Tips Posts:

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The Ultimate Seed Starting Guide - Garden Therapy (2024)

FAQs

Is seed starting worth it? ›

You can use just a regular potting mix, however, this makes it much easier and more likely to run into issues with drainage, moisture retention, pests, soil density, nutrient availability, and more. If you want a smooth and seamless experience starting seeds indoors, we highly recommend using a seed starting mix.

What is the best seed starting mix? ›

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 many seeds should you plant per hole? ›

A pencil is a handy tool to make a hole and determine the correct depth. You can measure the point of the pencil ahead of time to denote a quarter or half inch. Place your seeds in the hole and bury them. Usually, you want to plant two or three seeds per hole because not every seed will germinate.

How often do I water seedlings? ›

Generally, seedlings should be watered when the top inch of the soil feels dry to the touch. For those using peat-based mixes or coco coir, these materials can dry out quickly and may require more frequent watering, potentially daily under high light or warm conditions.

Is potting soil OK for seed starting? ›

Potting soil is typically heavier and may contain more nutrients than seed starting mix, leading to poor germination rates and root development. The seed starting mix is specifically formulated to provide the right balance of aeration, moisture retention, and sterility required for optimal seed germination.

What is the hardest seed to germinate? ›

Some seeds like Allium 'Purple Sensation' and Eryngium giganteum need a long period of cold-moist stratification with alternating temperatures. These are the most difficult seeds to germinate.

What plant seed germinates the fastest? ›

Cucumbers, lettuce, radishes, spinach, turnips, basil, melons, beans, peas, and other seeds that germinate quickly are some of the greatest examples.

What is the easiest plant seed to grow? ›

Easy Plants To Start From Seed
VeggiesFlowers and FoliageHerbs
Beans Tomato Peppers Spinach Cucumber Lettuce Broccoli SquashZinnias Cosmos Celosia Marigold Calendula Nasturtium Sunflowers Coleus Morning Glories StrawflowerBasil Cilantro Chamomile Dill Lemon balm Sage
Feb 5, 2024

Does 1 seed equal 1 plant? ›

In general, two to three seeds should be planted per hole. Seeds do not have 100% germination rates, so not every seed planted will sprout. Overseeding holes, cells, or pots will help ensure that the number of plants you desire will grow (or more.

Can you plant seeds too deep? ›

Planting too shallow may result in poor germination due to low soil moisture retention near the soil surface or seed injury due to insects or disease. Similarly, if placement is too deep, seed may have delayed germination due to lower soil temperatures or result in poor germination or seed injury.

How deep should you plant seeds in the soil when planting? ›

The rule of thumb is to plant seeds at a depth equal to two or three times their width. It is better to plant seeds too shallow than too deep. Some seeds, such as certain Lettuces or Snapdragon, need light to germinate and should not be covered at all.

Do seedlings need full sun? ›

Initially place seedlings outdoors in a sheltered spot – protected from wind and direct sun. Each day following, expose plants to another 30-60 minutes of filtered sunlight. Work your way up to giving plants direct morning sun, followed last by noon-day sun.

How do you make seedlings thrive? ›

Keep your soil moist, but try to avoid soaking it. As your plants' root systems develop, they will take up more water each day. Your potting mixture will also determine how well water drains from your system. Overwatering can also create soil conditions where small insects like fungus gnats thrive.

Do seedlings need direct sunlight? ›

The best thing to do is to keep them in a bright spot away from any direct sunlight, or under grow lights. A common misconception is to plant seeds and leave them in bright sun, which can work for many garden varieties, but not for most exotic seeds(which is what we're primarily focusing on in this post).

Is it better to start seeds or buy plants? ›

Larger plants do better being placed in the garden as seedlings versus seeds because of the length of time they need to grow. On the other hand, plants that are smaller in size (like lettuce plants) don't take as long to reach maturity and may do much better in your garden being direct sown from seed.

Are seed starting trays worth it? ›

Overall you get a more developed, fuller root system for your seedling. Despite these amazing benefits, I just don't have the patience myself to plant my seeds into soil blocks- it can sometimes be a finicky process and I just much prefer the convenience of seed trays.

Is it bad to start seeds too early? ›

Whatever your temptation, know that starting seeds too soon does more damage than good. Some seeds do well in the colder, darker late winter days–including lettuce, onions, hardy brassicas, and seeds that are slow to germinate, like hot peppers and celery.

How long can seedlings stay in seed starting mix? ›

Typically, your seeds will stay in their seed tray for 4-6 weeks. After this period, you will either need to transplant the new seedlings into larger pots or transplant them outside. Check your seed instructions and pay attention to your frost dates before transplanting young plants outside.

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