If you haven't already done so, read everything in this link, FIRSTRAYS.
Ray is a member here and the person who developed the S/H method. He operates in Pennsylvania so the problem isn't your geographic location. You may have to adjust temperature and lighting for the plants you are attempting to grow in S/H.
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Anon Y Mouse
"Never attribute to malice that which is adequately explained by stupidity." Hanlon’s Razor
I am not being argumentative. I am correcting you!