DIY Indoor Seed Starting System (2024)

Introduction: DIY Indoor Seed Starting System

By fozzy13

About: I'm a Mechanical Engineer who has been a part of this community for over 10 years! My interests have evolved over time, and now center around 3D printing. More About fozzy13 »

I have for a long time wanted to try my hand at growing something. I think it's awesome to be able to grow food oneself, instead of buying it from large-scale farms, after it's been processed and shipped thousands of miles. For this reason, I decided this spring to attempt to grow some crops of my own. However, in Northeast Ohio, winter lasts too long, and spring comes around too late to plant seeds outside initially. This system allowed me to start my seeds about mid-February, and keep them inside until the weather wouldn't destroy them.

This Instructable will focus on what I used and built to start my seeds rather than in-depth gardening theory. This is because this project was my first attempt at growing plants, and I am far from an expert gardener. This project was done for fun and learning about gardening, while still trying to be able to harvest some produce, in a cost-effective manner.
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Steps:
  1. Choosing What to Grow
  2. Pots and Planting
  3. The Frame
  4. Lighting
  5. Conclusion

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5/21/2012: Thanks for the feature!!
6/7/2012: A sincerest thank you to all who read and voted for this Instructable in the Gardening Challenge! Second Prize!

Step 1: Choosing What to Grow

Since this is my first attempt to grow any plants, I wanted to start simple. Therefore, I chose to try to grow sunflowers and tomatoes.

I assumed that sunflowers would be less maintenance than other vegetable plants because they're flowers. I'm not sure what my logic here was, but that's how I saw it : ). Also, sunflowers can have their seeds harvested and eaten, so not only do they look nice, but produce food. The seeds that are harvested can also be used to plant more sunflowers next year. As for tomatoes, I made another assumption that tomatoes seem to be a popular starting point for gardeners.

I went down to Home Depot and grabbed some seeds. I got four breeds of sunflowers, and one of tomatoes. If I could do this project over again, I would have gotten less variety, in an effort to keep things relatively small and simple for my first gardening experience. The sunflower breeds I bought were: American Giant, Mammoth, Autumn Beauty, and Teddy Bear. The tomato seeds I bought were Beefsteak Tomatoes.

Step 2: Pots and Planting

The first thing I did was decide what containers I wanted to start my seeds in. On Instructables you'll see everything, from pop bottles to egg cartons, to bio-degradable options. I did not have egg cartons or a sufficient amount of pop bottles, so I took a trip to the dollar store, and found small, thin, plastic pots. I got twelve in a pack for a dollar, and bought six packs.

I took a trip to the garden store after that, and told the employee there that I needed a bag of dirt. I bought the MiracleGrow stuff in the picture below. It occurred to me later that actual seed-starting soil/pellets are sold, and could have been better for this step. However, the soil I bought worked fine as well.

I then set up in my garage, planting seeds of each variety, making sure to keep everything organized by species. I ended up with 70 plants, and used that number to help decide how large of a frame to build to hold all of the small pots. I wanted to have a fairly high number of plants to account for seeds that may not work, and plants that die early.

Step 3: The Frame

Now that I had 70 little pots sitting on the floor of my garage, I needed a place to move them so that they would be able to receive sunlight and grow. Living in suburban America, this can be a challenge, so I built a frame to hold all of the plants to help keep them organized.

The frame was built using 1/8" thick plywood, salvaged from a wooden pallet I found a long time ago. It is held together using hot glue. I wasn't particularly worried about the strength of the frame, since it would only be sitting inside. The pieces were cut using a jig saw, using measurements from the small pots as a guide, to allow for ten columns of seven plants each. Two columns would be used for each species. The pots hang slightly about the floor, balanced between the two pieces of wood on each side. Newspaper is placed underneath the frame to catch and absorb any excess water.

Step 4: Lighting

Based on countless random sources online, I knew that the light from the largest windows in my house probably wouldn't be sufficient for my seedlings. Also, on cloudy days, I couldn't have the young plants receive no light all day. Grow lights are the solution to this problem.

The stand is made up of two-by-fours that I had left over from another project. They are cut and nailed together into a T-shape, and a notch was cut into the top using a jig saw and oscillating cutting tool. A large aluminum pipe that I've had laying around for a long time was cut to fit between the two T-shapes. I bought two light bulb sockets used for lamps and compact-fluorescent flood lights from Home Depot. The flood lights I chose seemed to have the best lumen-per-dollar ratio of the compact florescents that I looked at. The sockets I chose to have a twisting switch built in, so that the lights could be easily turned off. The sockets were attached to the aluminum pipe using small pieces on bendable steel and screws to create a sort of bracket. Both the steel and screws were taken from some sort of appliance a long time ago. The bulbs were wired in parallel, using a long wire salvaged from a vacuum cleaner.

My only costs here were the light bulb sockets and the bulbs, which came to less than $15 USD.

Step 5: Conclusion

After the set-up is complete, the only thing left to do is water the plants regularly, and wait for them to grow!

Thanks for reading! I like comments, so if you would like to leave one, don't be shy! They help keep me motivated to keep posting Instructables. Also if you wanted to rate this Instructable and follow me, that would be awesome too. : )

If you really like this Instructable, it is entered into the Gardening Challenge contest, and I would really appreciate a vote.

Thanks again, and good luck gardening!

DIY Indoor Seed Starting System (5)

Runner Up in the
Gardening Challenge

DIY Indoor Seed Starting System (2024)

FAQs

DIY Indoor Seed Starting System? ›

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.

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.

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 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.

Can I use egg cartons to start seeds? ›

You can use egg cartons as a seed-starting tray! Depending on the type of carton you have, you can even cut apart the individual sections and plant them, as the carton will biodegrade. Be sure to poke small holes for drainage, and put the cartons on a tray or in a shallow pan to catch any residual water.

Should you soak seeds before planting indoors? ›

If you're storing and sowing seeds inside, they won't go through a cold winter, which some need to signify it's time to wake up and grow. To ensure high germination rates, wake seeds up, and potentially speed up the process, soak seeds before sowing them to soften and loosen that outer protective layer.

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.

How many hours of light do you need to start seeds indoors? ›

Most seeds will not germinate without sunlight and will perform best with 12 to 16 hours each day. Indoors, place seed containers in a sunny, south-facing window and give the container a quarter turn each day to prevent the seedlings from overreaching toward the light and developing weak, elongated stems.

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.

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.

Are seed starter kits worth it? ›

However, for seeds to flourish into vibrant plants, they require the nurturing care facilitated by the right tools and environment. This is where seed starting kits come into play, serving as indispensable companions for both novice and seasoned gardeners alike.

Do egg cartons work as peat pots? ›

Also, resist the temptation to plant your cardboard egg carton as cow or peat pots that decompose quickly when planted. They maintain their structure much longer, constraining the root system of your transplant. Plus, the dioxin, bleach and other chemicals in egg cartons you'd probably prefer to not add to your garden.

Can you use styrofoam egg cartons to start seeds? ›

If you used a styrofoam or plastic carton, you'll have to remove the plant and its soil from the cup before planting. Poke your finger down the side of the cup, and lift out the seeding and its roots with as much of the soil as possible. Place it into a hole in the garden, and cover gently with more soil.

What can I use as a seed starter? ›

Newspaper, paper towel rolls, small boxes, and shredded paper can all be easily transformed into biodegradable seed pots. Follow our step-by-step instructions and you'll soon have plenty of pots for growing all the seedlings you want. Check the seed packet to help you figure out when to sow your seeds in your DIY pots.

How to make a homemade 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 start seeds indoors with paper towels? ›

Place seeds inside the damp towel or filter, and slide it into a sandwich baggie. Don't seal the baggie tight, because that can provide good conditions for mold to grow. Stash the baggie in a warm spot (65-75°F)—a laundry room, southern window or sunroom. Monitor the towel for moisture and the seeds for signs of mold.

Do I need a heat mat to start seeds? ›

While your lettuce seeds may germinate just fine in an unheated room or shed where the temperatures range from 40-65℉ in the Spring, other gardening staples will not. Tomatoes, for example, rarely germinate below 75 degrees. To start these properly you will need to warm the soil using seedling heat mats.

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