I have started a variety of plants from seed, many/most of which have germinated and are growing... When should I fertilize them? What is the best product keeping in mind that I am committed to a completely organic garden?

Thank you in advance for everyone's help!

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Compost... Beautiful Compost

Fish emulsion is a good organic fertilizer. Some folks also swear by kelp extract or other seaweed extracts. Compost tea is wonderful if you have access to it. As to timing, the advice varies, but generally wait until the second set of true leaves appears or until you repot or transplant.
You can get much of your fertilizer for garden plants through soil amendments like bone meal, blood meal, compost, rotted manure, cottonseed meal, etc.

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Dave
Even my growlights are getting restless!

Hey Winston.
The first set of leaves on most things are called cotyledons. They tend to be round or elongated ovals. They never develop the shape of true leaves...they're just little solar collectors get get the plant going. The next set, and all later sets, are the true leaves.
Most plants fall into 2 categories...monocots and dicots (monocotyledons, etc.) Trees, tomatoes,...these types aer dicots, 2 cotyledons. Grasses, corn...monocots, one cotyledon. Not that you need to know that, but that's the scoop.

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Dave
Even my growlights are getting restless!

I agree with the fish emulsion Winston. Half strength until the plants are a about a month old should do it. Worm juice from a worm farm diluted is also excellent for seedlings. Seaweed or kelp extract is excellent for promoting strong root growth, so is great fot younguns and also as an aid to transplanting.

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The secret is the soil.

I really like a product I get at Lowe's. It's made by a company called Epsoma, but I forget the product name. It comes in small bags, about 8 pounds, I think. It's all organic. I also use their brand of greensand...a good source of potassium and very beneficial.

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Dave
Even my growlights are getting restless!

Nothing stinks worse than fish emulsion fertilizer, IMHO. Smell stays on your hands toooooooooooooo long. Because of that, I dilute tomato plant food way down and then keep it off the leaves. You don't want to use much fert. until the tomato starts forming fruits or you get gigantic plants which are slow to develop fruit. Methinks they think they're going to live forever and aren't worried about the next generation.

No more than every 2 weeks, and again when you plant. Depending on what you put into the soil, you nay not need to fertilize any more after that.
I just bought some more of the Epsoma...the product is called Plant-tone. It is a granular product with all necessary nutrients and trace minerals. I work some into the soil when I plant, and top dress around the plant. I do the same with gypsum and bone meal for my tomatoes. Don't use water soluble nitrogen fertilizer on tomatoes, except at planting time, until they have set fruit, or they'll get huge and never fruit.

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Dave
Even my growlights are getting restless!

Agway is a good source for all of the Espoma products.

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John - Zone 6