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Home » Headline, Organic Gardening

How To Start Seeds Indoors- The Easiest Way

Submitted by on February 10, 2017 – 8:11 am
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There are so many benefits to starting your plants from seed. If you’re debating whether or not it’s worth starting your garden from seed this year, check out my article on Starting Seeds vs. Buying Plants for the pros and cons of each.

Can I just say… starting from seed is not easy! If you’ve never done it there’s definitely a learning curve, even if you’ve been gardening all your life. If you’ve always planted from nursery stock, consider learning how to start seeds indoors. For me, it was important to learn how to start my garden from seed so that I wouldn’t be dependent upon nurseries to supply me with my plants each year. A day might come when we have to start a garden without the help of outside sources. It would be good to know how to survive without them.

I’ve made a lot of mistakes and tried a lot of different methods, and have finally come up with the easiest way to start plants from seed indoors.

 

Here’s what you need to know to successfully start seeds indoors for strong, healthy plants!

Is it time? Determine when to start seeds indoors.

Certain plants need to be put in the ground at certain times. Broccoli and cabbage will go in much earlier than tomatoes and peppers because they’re cold hardy, whereas tomatoes and peppers need long, hot days to thrive. Cold hardy plants can be put in before the last frost, but warmer weather crops must be planted after the last frost or they’ll die in the cold weather. You want to start seeds indoors in order of when things should be planted.

When you start your seeds indoors depends on where you live in the world. Colder regions have a shorter growing season and seeds will be started at different times than warmer areas. You’ll need to know your plant hardiness zone. Here in growing zone 7b, I start cold weather crops (broccoli, cabbage, cauliflower, celery, onions) in late January. Our last frost date is generally expected around mid-April every year, but I can get these guys into the ground before then once they have several sets of “true” leaves. If a snow is expected I’ll cover the plants with a row cover or plastic pots so they don’t get crushed.

When you start your seeds also depends upon what you’re planting, whether it should be planted before or after your first or last frost date (depending on whether you’re doing spring or fall planting), and how many days it takes to get several sets of true leaves. Usually the pack of seeds will tell you when to start the seeds according to your hardiness zone, and whether you should start them indoors or direct sow. You can also do an online search for the seeds you want to plant to find this information.

seeds

Know the best plants to start indoors.

Not all plants can be started from seed indoors. Some must be direct sowed, meaning the seeds need to go straight into the garden where they’ll grow. Some plants cannot tolerate being transplanted (such as carrots) and some are best direct sowed because it’s the easiest way to plant them (such as peas). Watch me and one of my kiddos planting carrots and peas in this video!

Peas can be transplanted, but it’s a lot of work when you can simply stick the seed straight in the ground and it will grow just as well. I’ve experimented with starting pea seeds indoors several weeks before direct sowing, and was surprised to discover that there wasn’t a difference in growth when started indoors. The direct sowed seeds quickly caught up with the transplanted seedlings, and both ended up producing at the same time. So there was no advantage to starting peas early indoors.

Seeds that can be started indoors include: broccoli, cabbage, cauliflower, onions, tomatoes, pepper, eggplant, some flowers, artichokes, asparagus, herbs.

Seeds that are best direct sowed include: all root crops (carrots, radishes, turnips, etc.), peas, squash, pumpkins, corn, beans, melons, tender flowers, leafy greens (kale, spinach, lettuces, etc.), garlic bulbs, potatoes, cucumbers. Again, some of these can be started indoors, but it’s easiest to direct sow them if possible.

 

Find the right containers to start seeds in.

I’ve tried starting seeds in everything from eggshells to paper pots and soil blocks. For a long time I even washed and reused nursery flat trays. My go-to right now are 3oz plastic dixie bath cups, because they’re just the right size, they can be washed and reused, and they’re cheap. I also like the plastic cups over the paper ones because I use a sharpie to write what I’ve planted on each cup and when paper cups get wet it makes the ink run. Yogurt single cups also work well. You don’t want anything much larger than 3″ deep and 3-4″ wide because you’ll be transplanting your seedlings before they get big enough for a large container like that (and it would be a waste of soil). Whatever you use you need to be able to poke holes in the bottom for drainage so that your plants don’t get waterlogged.

You’ll also need shallow, watertight trays to hold the planting containers. Remember, they’ll be draining water and you don’t want a mess on your countertops.

Use the right growing medium.

I made a huge mistake the first year I started seeds indoors. I started them in potting soil. I couldn’t understand why the seedlings were dying left and right! Finally I figured it out. You need seed starting mix to start your seeds indoors, not regular potting soil. This particular type of growing medium has all of the nutrients your little seedlings need to get off to a great start. I’ve had better success with Miracle Grow Seed Starting Mix over the Jiffy brand, though I’ve used both and either will work.  A high quality, weed-free compost can also be used to start seeds if you have access to it or can make it yourself.

Plant Seeds at the Correct Depth

How deep you plant the seed will have a huge impact on how well it grows. Plant the seed too deeply and it’ll germinate beneath the soil and run out of energy before it reaches light, causing it to die before it even emerges. Plant the seed too shallow and the roots will be weak. Usually the pack of seeds will tell you how deep to plant a seed, but the general rule of thumb is to plant at a depth of twice the seed’s diameter. Larger seeds are planted more deeply than very small seeds. Tiny seeds are generally surface sowed and lightly scratched in and watered.

 

Label. Label. Label.

After you’ve planted your seeds you’ll need to label the containers so you know what’s growing in them. Use a sharpie to write directly on the container, or use a popsicle stick or plastic plant marker to stick in each container. I’ve had better luck writing directly on the cups vs. sticking a marker in them. It’s too easy for popsicle sticks or plastic plant markers to fall out of the containers, and then it can get really confusing come planting time. What kind of tomato was this again? Oh, and I wouldn’t recommend using sticky labels on the containers either ’cause when they get wet from watering they’ll come off.

 

Watering just right.

I’ve found it works best to dampen seed starting mix with water and mix it thoroughly before filling the containers to be planted. This way there aren’t any dry pockets of soil in the pots.

Once the seeds have been planted, cover the containers with a plastic bag (left slightly open for ventilation) and keep them covered until the seedlings emerge. Keep a close eye on them and remove the cover as soon as the first sign of life appears. This will create a small greenhouse effect and will help to keep the soil moist for germination.

Keep the soil moist by misting the seedlings with a spray bottle and bottom watering the trays. Pour enough water into the waterproof trays so that the soil can wick it up to the roots of the plants. The soil needs to stay slightly moist, but not soggy. Over watering will kill the plants. When you see the surface of the soil getting dry, give it a little spray and a little drink from the roots.

If you’re on municipal water you’ll want to use filtered or rain water for your plants. The harsh chemicals in treated water will often kill your seedlings.

How To Give Seedlings Light Indoors

If you have a south facing sunny window that gets at least 6 hours of full sunlight, this would be an ideal place to set the seedlings to grow. If you notice that the plants are getting very long and scraggly (“leggy”), it means they are stretching to find the light because it isn’t strong enough. Leggy plants will be weak, so good sunlight is very important.

If you’re like me and you don’t have a good window to put seedlings in you can use a regular shop light with fluorescent bulbs or you can buy a grow light. I always pull the shop lights out of my husband’s workshop when I’m ready to start seeds and it has worked great for us.

When using artificial lighting to grow plants it’s important to keep your seedlings about 3-4″ away from the bulb. If the bulbs are too high the seedling will get leggy as they stretch to find the light. If the bulbs are too close they can burn your plants. Make sure to raise the light as the plants grow so that the foliage doesn’t touch the bulbs.

Thinning is important.

It’s a good idea to plant at least two seeds per container in case one doesn’t sprout. If the seeds are a couple years old I even plant three at a time. If more than one seed germinates and two seedlings are growing together in the same container you’ll want to thin them to the strongest plant. Use a pair of sharp scissors to cut the weakest looking plants. Don’t try to pull them out or you might uproot both plants. It might seem like a waste to plant more seeds than you’ll use, but if you have a poor germination rate you’ll have to replant more seeds which will set you behind the planting schedule.

 

Quick Recap, and Step-By-Step Instructions

 

1. Determine which seeds you’d like to start according to planting times in your area.

2. Mix seed starting mix with enough water to thoroughly moisten. It should be an oatmeal-like consistency.

3. Choose the containers you’d like to use to start your seeds and make sure there are several holes in the bottom large enough to allow excess water to drain out.

4. Fill your containers with damp seed starting mix and plant your seeds at the recommended depth (no more than 2x the diameter of the seed). I like to use a toothpick to make a hole in the soil for dropping the seed into. Make sure to label your containers so you know what’s planted in them.

5. Place the filled containers in a shallow, watertight tray and slip into a plastic bag, leaving one end open for ventilation.

6. Check the seeds daily and remove the plastic cover at the first sign of germination (when the plants pop through the soil).

7. Immediately place the newly emerged seedlings underneath a grow light, 3-4″ from the bulb, or in a south-facing window with at least 6 hours of full sun.

8. Water the plants as needed with a spray bottle and by adding some water to the tray to bottom water the plants. Keep the soil slightly moist, but not soggy.

9. As the plants sprout and grow, thin them to one strong seedling per container.

10. When the plants have at least two sets of “true” leaves they are ready to be transplanted outdoors, pending frost dates.

There you have it! Once you’ve started seeds indoors and your plants are up and growing you’ll be ready to move them to their new home in the ground.

Next Step: How To Transplant New Plants Into The Garden

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