Starting Seeds Indoors is Easier Than You Think
February 24, 2026

Starting Seeds Indoors is Easier Than You Think


Why Start Seeds Indoors?

Starting seeds indoors is one of the most overlooked gardening skills. If you are able to germinate and grow your own food from seed, you have unlocked a new level of control over what you grow and when! No matter what happens to your access to plant nurseries, you will be able to continue your garden. Pair this with saving seeds from year to year, and you can become completely independent! Starting your own seeds at home is cheaper, offers more plant choices, and extends your growing season. That’s a powerful combination. In this article, I will take you through how and when to germinate your seeds indoors, how to grow them on, and how to get them ready for transplanting outdoors. 


What Seeds Should Be Started Indoors?

Keep in mind that some seeds need to be started indoors, but others should be planted directly in the garden bed. The seed packets should indicate if this is the case. The packets might say, “direct sow” or “start indoors 6-8 weeks prior” or something along those lines. This will give you a basis to know when and what seeds need to be germinated indoors or not. If your packet doesn’t say or if you don’t have the instructions anymore, a quick online search will reveal what the best course of action is. Many gardening books will also include these guidelines.


Generally speaking, tomatoes, peppers, herbs, most flowers, kale, and onions (from seed) can be started indoors ahead of time. Crops that are best planted directly in the garden are carrots, radishes, beans, and large flowers like sunflowers. Things like leaf lettuces, spinach, and native flowers could go either way depending on your preference.


When To Start Seeds Indoors

Timing does matter quite a bit in this regard. Start them too early, and they will outgrow their indoor situation; start too late, and they will be too weak to transplant outdoors on time. Once you have found how many weeks a seed is supposed to be started ahead, count backwards from your estimated last frost date (find that date on climate.gov) and you will have a rough idea of the golden time to start that seed. 


What Supplies You Need

All you need is some kind of container with drainage holes to start your seeds in (these come in many forms and are largely a matter of preference), a seed starting/potting soil mix (do not use outdoor soil), a light source (I always recommend supplementing with simple grow lights although a very bright windowsill can suffice sometimes), and a way to water the seeds. If you have just those things, you will have some degree of success. Optional extras that will only improve your seedlings’ health and overall germination rates are seedling heat mats and humidity domes. These two items just improve the environment for the young tender seedlings and make it easier on you and them. 


How To Plant

  1. Fill your chosen container to the brim with clean seed starting mix. This is typically a blend of coconut coir or peat and other amendments to improve drainage and aeration. 

  2. Wet the soil thoroughly. The soil will slightly condense; this is good. Don’t add more.

  3. Using a chopstick or pen, poke a hole in the soil in the middle of each container (or a hole every 2-3 inches if using one large container for many seeds). The depth will depend on the seed. Again, the seed packet should say how deep they need to be planted, but the general rule is to plant them two to three times as deep as the seed is large.

  4. Drop 1-3 seeds into each hole and cover the hole with soil.

  5. If you thoroughly wetted the soil in step 2, you do not need to water again. You don’t want to wash away the seeds, so before germination has occurred, only water gently with a spray bottle or other similar solution. 

  6. Be sure to label what containers/where you planted what variety of seed. Unless you are doing all the same thing, you likely won’t remember. Many seedlings look identical!

  7. If desired, place the containers on top of a seedling heat mat set around 80F and cover with plastic wrap or a humidity dome until germination occurs.

  8. As soon as you see any seedling poke through the soil, remove the plastic or humidity dome and immediately place it in direct sunlight or 2-3 inches underneath a grow light. Seedlings need much more light than most people realize, and they will become weak if not exposed to enough. 


Growing Indoors: The Big Three

The important things to keep in mind while your seedlings are growing inside are light, water, and temperature. Not enough light or water, or too low a temperature, and you will have seedling failure. Most seedlings need to stay around 75F after germination, and the soil should be kept moist (but not soggy) for at least the first couple of weeks. They also need 8-12 hours of direct sunlight from a very bright sunny windowsill or a grow light. Grow lights are getting very inexpensive these days, and they can make a remarkable positive difference in seedling health if used correctly. 


If all is well, the seedlings should be erect, healthy green, and growing consistently. If they are pale, falling over, or showing stalled growth, you likely need to make a change as soon as possible. Continue these conditions until about 2 weeks before your expected transplantation date.


Preparing Seedlings For Transplantation: Hardening Off

If you have made it this far, congratulations! You seedlings are *almost* ready to go outside. Do not skip this critical step, or you will risk losing all the time and effort you have put into your seedlings so far. You now need to prepare your seedlings for the garden by gradually exposing them to outdoor conditions and watering practices to help them avoid transplant shock. 


The general idea is to slowly expose the seedlings to the new conditions over 1-2 weeks. This means placing them outdoors for an hour or two the first day and, over the course of the 7-14 days, gradually increasing their time outside until, on the last day or two before transplantation, they can be outside for a full 24 hours. Remember that your seedlings are very delicate at this stage! Protect them from freezing temperatures, high winds, or other harsh circumstances during this phase. It is a bit of a pain to carry all your seedlings in and out each day, but I promise you, they will be so much happier and stronger once they are in the garden if you take the time to do so.


Start Small and Learn As You Go

As simple as it sounds, it can feel quite daunting to start your own seeds at home. Just remember that it takes time to learn a new skill. If you are just starting out, aim for progress, not perfection! Perhaps start with just one or two seed varieties the first year and expand as you learn. And if you lose some seedlings, remember that this is normal. Even professionals have losses each year. Just keep trying and don’t give up; That is often the difference between someone who can and someone who can’t. Happy gardening!


Other Great Resources

UMN Extension

USU Extension

CAES Field Report

About the Expert:

Lara Wadsworth is a freelance horticulture writer with a Bachelor's degree in Horticulture and over three years of experience creating engaging content about gardening and plant care. As a wife, mom, and dog lover, Lara understands the importance of balancing a busy life with a thriving garden. She values practical advice and effective strategies that empower beginners and experienced gardeners alike to grow with confidence. Through her writing, she aims to inspire others to enjoy the rewards of gardening, no matter their skill level.

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