In cold climates, growing under cover allows you to extend the growing season by starting your crops early and giving them an almost endless summer. New glasshouses are costly but glass has advantages over plastic, longevity being one of them. Ultraviolet light won't cause your panes to fall to bits, as plastic does over time, but broken glass panes can be expensive to replace. Plastic tunnelhouses generally cost less and are easier to transport and install. Or build your own glasshouse (or a cold frame – pictured – for smaller gardens) from old windows.
from
http://www.stuff.co.nz/life-style/home-property/nz-gardener/90825763/Glass-greenhouse-what-to-grow-how-to-care-and-essential-tools
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