Starting Onions Indoors

Here are three flats of onions I planted on February 8th, 9 days ago. Most of the nearly 1,600 seeds are sprouting nicely in flats in the basement. The flats are on a heat mat and lit with various LED grow lights we have accumulated over the last few years. The onions are growing in a commercial potting soil. I used to make my own potting soils, but I’ve found the commercial mixes to be much more reliable in giving me good strong root growth, and they are...

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