Seed Starting Part 3: Starting your seeds indoors

After a long winter there’s nothing more hopeful than pushing seeds into fresh potting mix.

For many years I have been starting my seeds indoors under lights before transitioning them to an outdoor unheated hoophouse.

I want to share with you how easy seed starting can be!

I’ll start by outlining what you’ll need to get started:

  • Pots and domes

  • Seeds

  • Potting mix or growing medium

  • Lights

  • Heat mats

  • Shelves

Now I’ll walk you through each of the above items in more detail…

Pots and Domes

I use 11x21 inch trays and fill them with soil blocks. Interested in soil blocking? Read more HERE!

You can also use 4 pack or 6 pack plastic containers. Or plant straight into 3-4” pots. You can find all these options at your local garden store.

So should you choose a larger pot or smaller pot? If you plant into larger containers you won’t have to worry about transplanting later when your plants are getting big. But if you’re growing a lot of plants you’ll get more plants in less space if you use the 4 or 6 packs.

Also invest in a few plastic domes! These will help keep the humidity perfect for seed germination.


Read Part 1 of my series on seed starting HERE. It’s all about ordering seeds.

Potting Mix

There are a few products that I really like. If you’re in Anchorage, you can find them at Southside Garden Supply or Alaska Mill and Feed.

1) Pro-mix MP Mycorrhizae Organik. This is a great all-round potting mix and it’s organic! I’m using this for all my seed starting needs this year. It is also working great for soil blocking! Find this in cubes at Southside Garden Supply.

2) Fishy Peat or Alaska Earth - made in Alaska! I’ve had success with both products. They are not organic but are made with wholesome natural ingredients. Both can be found at Alaska Mill and Feed.

3) Fox Farm Light Warrior or Ocean Forest- this company has a variety of potting mixes and seed starting mixes. They use natural products and they work great! Southside Garden Supply and Alaska Mill and Feed carry these.

Note, that if you’re growing a lot of starts, buying a cube will be more cost effective than buying individual bags. Ask your local garden store if they offer these products in cubes!


To be honest, I tend to be opportunistic when it comes to lighting. I look for free stuff and cheap stuff. And what’s great is that they’ve all worked just fine. So here’s what I’ve used: LED shop lights from Costco, florescent shop lights as found in any hardware store, grow-specific LED lights. All these will do the job! I say buy whatever fits your budget best.

The most important steps when it comes to lighting is 1) to keep the lights just a few inches from the plant to prevent “leggyness” and 2) to give your plants 16 hours of light (an inexpensive outlet timer works great for making this happen).

Heat Mats and Thermostats

For the BEST germination, invest in a a seed starting heat mat AND thermostat made specifically for this. This will cost you around $70.00-$80.00 If you can’t afford this your first season, don’t sweat! But even soil heat at around 75-80 degrees will give you the best seedling germination.

Soil temperatures are roughly 10 degrees cooler that ambient room temperature, so often your soil may be cooler than you think without a heat heat mat.


I use simple metal wire shelving so I can stack my seedlings. But get creative here! You’ll just need a place to hang the lights and a place underneath to set your trays.


1) Fill your pots with damp soil

2) Put 1-2 seeds on top. Your seed packet will give you a germination rate for each seed. If its less than 80% put 2 seeds in each pot.

3) Lightly cover with soil. Just barely cover as light aids the germination of most flower seeds. I like to cover just so there is a bit of soil contact on top of seed.

4) Cover with a plastic dome and place under lights and on heat mats.

Happy planting out there!

Starting Seeds with Soil Blocks

Last year I was inspired to change up my seed starting system to include soil blocking. If you’re not sure what this is, please read on! Soil blocking requires taking a wet grow medium and using a little blocking press to create perfect stand alone squares in which to sow a seed or transplant. I invested in a 3/4” blocker for germinating slow growers and tiny seeds and a 2” blocker for transplanting into or sowing larger or quick growing seeds. These are available from Johnny’s Seeds (my favorite online planting/growing store).

Read More