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Tips:5¢ Advice:Free
Join Date: Aug-2001
Location: Silicon Valley
Country: USA
Posts: 9,747
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Are you talking about beds in the ground? The most common way to do that is with poly tunnels.
If you are talking about heated trays, that can be done with heating mats or cables.
It's probably important to discuss scale and whether you are talking benchtop or field.
Regards,
Matt
P.S. There are some interesting products at ***CHARLEY*** if you search under "propagation" or "heat" Be sure to click the keyword box.
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