Using an Indoor Seed Starting Setup (2024)

As I’m writing this, there’s a steady rain pouring outside, which is truly my favorite weather for staying indoors and starting seeds in Winter. This indoor seed starting setup is something I’ve wanted for a long time, but finding space in my 700 square foot home was always a struggle. If you’ve been a longtime blog reader, you’ll know that I’ve tried a wide variety of seed starting setups over the years—outdoor cold frame, sunny window, hybrid variations, garage, etc.—and so, I’ve been really anxious to try a fully indoor seed starting setup.

Before I go on, I do want to clarify. There is not only one way to start seeds. If anything, my history is proof of that. Instead, I’d say that seed starting is very depending on our circ*mstances, resources, and lifestyles. For example, I didn’t feel comfortable devoting a whole room to seed starting in my small home, so that’s how I ended up with last year’s garage seed starting setup (which worked well for me). In fact, the main reason I’m switching to an indoor setup this year is because a) I hadn’t tried it before b) I wanted to be able to share and demonstrate one here on the blog and c) the garage experiences more temperature swings this time of year and is considerably colder than my house. My goal was to see if having a more compact, streamlined indoor seed starting setup would just make my life easier!

The Basics of an Indoor Seed Starting Setup

Today I’m starting some of my cut flowers indoors, along with tomatoes, peppers, and eggplants if desired. Since some of last year’s eggplants are still hanging out in the garden, I’m not really sure I want to plant more this year! Later next month is when I’ll start more seeds, and local gardeners can check out my personal seed schedule (available to subscribers of my email list) for more specifics.

Starting in January, I did a test run of this indoor seed starting setup and was really thrilled with the results (pictured below)! I grew various types of early Spring crops—like napa cabbage, kale, and more broccoli— to replenish the garden before our Summer growing season begins. Overall, I was very impressed by the quality of the seedlings and am excited to get some Summer seeds going finally!

To start, here’s a supply list for what I used to create this indoor seed starting setup:

Equipment for this indoor seed starting setup:

Greenhouse shelf

Grow lights

Timer for the lights

Heat mat and Thermostat Kit

Fan *the one we have is not available online, so I’ve linked a compatible one

Seed Cells/Trays/Pots (we love these Epic 6-Cell seed starting trays)

Watering trays

Optional: extension cords

These are the early spring crops I started using this setup in January. I’m very happy with the results! Sorry for the awkward photo, as I only had photos on my phone and had to crop them weird to fit the blogpost.

Safety Considerations

Without going into lots of detail, yes, grow lights can be irritating and damaging to the eyes. For me personally, I’m also sensitive to bright lighting anyway. I’d avoid putting your setup in a room that will be used throughout the day and keep the grow light staring to a minimum 😉

You probably know that water and electricity don’t mix. If you are planning to use a grow light in a humid or moist area, make sure to find one that is waterproof or rated for that type of setting (my home is not humid, nor do I plan to grow in that type of setting). Additionally, connecting to grounded outlets is important!

Lastly, be aware of the amount of heat emitted by your grow lights. Some emit more heat than others. Don’t keep flammable things nearby, and be careful of keeping your plants too close as they can burn. Each set of grow lights comes with manufacturer’s specs, so just be sure to read those.

Starting Summer Seeds Indoors

So, I really only use an indoor seed starting setup during the months of January-March/April. Aside from that, Southern California has great weather for doing a more hybrid type of seed starting if desired (outdoors during the day, indoors at night), or even fully outdoors during the early Summer and Fall (I’ve got a little grow-along over on my YouTube channel for that season). February is the month I typically start peppers—notorious for needing heat to germinate and can take a longer time to grow—and tomatoes and eggplants. Truly, I try not to rush warm weather crops. In my experience, starting too early has far more drawbacks than starting too late.

But today I’m going to use the rainy day and the desire to get this blogpost finished, as an excuse to start a large batch of seeds so I can demonstrate this really neat indoor seed setup and hopefully get you inspired for Summer gardening!

Let’s Assemble Everything & Start Seeds!

First and foremost, I chose this more compact greenhouse for my seed starting “shelf”. Initially, I looked into buying metal shelving that I’ve seen a lot of people use for seed starting. Most of the sets I saw were either too expensive or too large for what I had in mind. Circling back to when I mentioned that seed starting isn’t “one size fits all,” remember that I’m a backyard gardener that doesn’t have the need to start hundreds or thousands of seedlings. Another thing I liked about the greenhouse is the size and amount of shelves. It fits really nicely in the corner of the room and is pretty compact. Additionally, I didn’t need something with wheels, but I also won’t say no to something being easily moveable.

Please note, I am not using the cover for the greenhouse. In my room, the cover would just be too warm and stifle airflow.

Here’s a little overview of our very basic indoor seed starting setup. It’s been previously tested with some early spring crops (and a few experimental tomatoes) but is now ready for summer seedlings!

Using an Indoor Seed Starting Setup (2024)

FAQs

How many seeds per hole when starting seeds indoors? ›

Like most things in gardening, there are always exceptions to this rule of 2-3 seeds per hole. If you're planting large seeds like cucumbers, melons, or pumpkins, you should only use one seed per hole. However, you can still plant seeds close together and then thin them out once they've established themselves.

How do you set up an indoor seed-starting system? ›

How to Start Seeds Indoors in 4 Easy Steps
  1. Fill a large bowl with seed-starting mix and mix in a little water to evenly moisten the soil. ...
  2. Place your seed tray inside the drip tray and fill each cell to just below the top with soil.
  3. Sow your seeds. ...
  4. Cover the tray and place it under your lights on the heat mat.
Feb 10, 2023

What is the best system to start seeds indoors? ›

Seed flats are advantageous because they conserve seedling heat mat or germination chamber space. Many growers consider this to be the most efficient way to start large numbers of seedlings at once.

What seeds should not be started indoors? ›

Seeds for Root Crops Should Not Be Started Indoors

For that reason, it's best to start root crops like carrots, beets, radishes, and even potatoes in the soil where they'll grow.

How do I calculate how many seeds I need? ›

Take the total number of inches available for the crop and divide by the in- row crop spacing. For instance, 120 in. divided by 1 in. per pea seed equals 120 pea seeds.

How much should I water my seeds after planting indoors? ›

For the first few weeks you'll water once or twice a week. As the plants grow and use more water the growing mix dries out faster. You'll need to irrigate more frequently and with a larger amount of water.

What is the best container to start seeds indoors? ›

Any smaller plastic or styrofoam container can be recycled and used as a container for starting seeds. Make sure to poke drainage holes in the bottom to prevent over-watering. Some recycled containers to consider include: yogurt containers.

How do you prepare soil for starting seeds indoors? ›

Using soil directly from the garden is not recommended, because it may contain insects, weed seeds, or disease organisms that could damage or kill the young transplants. If garden soil is to be used, combine it with equal parts of sand and peat moss to improve drainage and structure.

Do I need a grow light to start seeds indoors? ›

The natural light from a window is seldom enough for good, strong seedling growth. They will usually stretch and lean towards the light and will not produce sturdy plants. Sowing seeds indoors under fluorescent lights is the easiest way for the home gardener to control growing conditions and grow healthy transplants.

What month is best to start seeds indoors? ›

Mid-March is the best time to start many vegetables and annual flowers indoors for transplanting outside once the threat of frost has passed.

What is the cheapest way to start seeds indoors? ›

It's very possible to create an affordable seed starting setup without fancy equipment! You can successfully sprout seeds in things like egg cartons and yogurt cups. Soil for seed starting can be collected from your garden and baked so that it's sterile, and you can use inexpensive shop lights as grow lights.

Can I start all seeds indoors? ›

Though some plants prefer to be direct sown (like squash and cucumbers), almost anything can be started indoors as transplants, if done right, including root crops like beets, radishes and turnips. The main exception are vegetables with long taproots like carrots and parsnips, which need to be direct sown.

Can you plant 2 seeds in one hole? ›

Depending on the seed, it's usually a good plan to plant more than one seed (but not too many!) Some seeds just aren't viable, so it's good to plant two or three just in case. You can always cull them later if you have multiple sprouts.

Do I plant the whole packet of seeds? ›

If only a few plants are needed, it is not necessary to plant all the seeds in a packet. Surplus seed often can be saved for a later planting date. Keeping seed dry and cool or at least at room temperature in a closed container is best.

How many seeds per seedling tray? ›

Fill your cell trays halfway with potting soil. Take another cell tray and stack it on top of the cell tray you are planting into. This will pack down the dirt and create divots to sow seeds into. Plant 2-3 seeds per cell and fill the tray with potting soil.

Do you start all seeds indoors? ›

Though some plants prefer to be direct sown (like squash and cucumbers), almost anything can be started indoors as transplants, if done right, including root crops like beets, radishes and turnips. The main exception are vegetables with long taproots like carrots and parsnips, which need to be direct sown.

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