Create Your Dream Garden 
Brush Your Seedlings
Seedlings started indoors tend to be weaker than those that sprout outside in the garden. Indoor seedlings tend to be taller and more tender, even if grown in strong light. The difference is the absence of wind—as wind shakes outdoor seedlings, their stems become stronger and their growth remains stocky.
Indoors, you can re-create the effect of the blowing wind by “brushing” your seedlings. Brush a folded piece of paper across the tops of small seedlings, quickly but gently bending them to horizontal and letting them pop up again. Do this twice a day for about a minute. As seedlings get larger, you can use your hand instead of the paper.
In studies, seedlings that were brushed had smaller, darker leaves that grew closer together than those of seedlings that were not brushed.
Read about seeds and artificial light
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Check out Horticulture’s Smart Gardening Techniques for tips on seed propagation.
Need more help with your seedlings? Read Success with Seeds and Propagation Techniques
Interesting, never heard of that before, but makes sense. I might even do that on windless days to my seedings even though they are in a small greenhouse with the vents and door partly open.