Many folks here on the WS forum recommend Pro-mix but since that isn't available where I am, I asked for its equivalent at a local seed/feed store and they sold me a brand named Fafard. What you need is seed starting mix rather than soil or potting soil altho' there are folks who use that successfully. Seed starting mix is lighter weight and doesn't compact into a brick inside the containers. Since this is my first year to winter sow I can't report on the pros or cons of using the professional mix but I thought I might give myself a little better chance of success by using that. I did mix in a little Miracle Grow just to use it up since that's what I bought first.
If you need any perennial seeds, I still have lots left you're welcome to in exchange for a SASBE.
Good luck and welcome to the asylum. They're all very friendly and helpful here.

You don't need to use a seed starting mix which is generally more expensive. Most any light fluffy soiless mix works well.
I use whatever I can find though I prefer Pro-Mix. Others prefer Miracle Grow or other brands. I have also used a special mix that a local nursery uses in their sowing. Some people mix their own from their compost and various additions.
You can search by putting soiless mix in the search box at the bottom of the page and find several threads that have discussed this question.

Does anyone have experience using Miracle Grow Organic Mix?
It is the only soil The Lowes closest to me has right now and I have never heard of the Organic Mix. Any comments would be great.

Carol

I would think the organic tag is a for marketing purposes... Its not going to add any value to your containers thats for sure, alot of companies are slapping that tag on thier wierdest places!

BTW not to get into a huge seperate debate, but alot of these "organics" CAN and I want to stress can, come from unregulated companies in south america or south asia. Its dubious at best what they refer to organic is the same as certified organic in the states.

For the most part, organic can be tagged on MOST soils sold in the state as long as they are not treated with chemical fertilizers or treated with seed suppressent. I wouldnt go out of my way to buy organic soil, thats for sure.. Lowes has pretty much closed up shop for gardening supplies until early spring, do you have any farm stores or feed stores, alot of these will carry promix or a something similiar. They like a sale even during wierd months to them.. they dont complain to dig some out of the snow =).

Silverkelt

You can also try going to local nurseries and asking them what they use for their own seed starting. I've done that and at one I ended up with Fafard and at another Sunshine MetroMix. Both worked well for me.

I bought the Metro Mix this year- good stuff, and $14 for 2.8 cu ft.

Karen

Miracle Grow here. It is what is available year round at Home Depot, and I have never had any issues with it. I have used both moisture control and regular and didn't notice too much of a difference.

Thanks, I just found regular Miracle Grow at Kmart, I think I'll mix them together just in case. Thanks for your help.
Carol