Fertilizer for seeds started indoors

I started flower and veggie seeds in Ferry-Morse seed starting mix. There was no NPK listing or instruction about fertilizing. So I am assuming that it is basically inert material.
When should I fertilize, with what, and how often? Thanks for any help.
Dave ....
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
I usually feed with 1/2 strength fish emulsion until they get to about 1-2" tall. Then I feed full strength. I also feed every other time I water. Make sure to let the soil dry between waterings, so you don't develop moldy soil with rotting plants. If you have a fan that can be put in the room, it really helps in air circulation. I started mine on a screened in porch last year and they did great. This year we've had wacky weather, so I've started them upstairs in my bonus room that has a ceiling fan.
You are right about the starting mix. It's usually a lighter mix made specifically for starting seeds. Usually there aren't any fertilizers added unless the package says so. Hope this helps.
Penny Zone 7b - North Carolina

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
I use Peter's 20 20 20, and water at about 1/2---3/4 strength every third time i water. For tomatoes and peppers, and eggplants, I also add 2 or 3 tsp of epsom salts to about 5 gallons of the fertilizer solution.THe epsom salts really make the foliage green, and seem to really make healthy stalks.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.