If you like to keep plants then having a small or large greenhouse in your home depending upon the space available is a good idea. So here you go for some do-it-yourself greenhouses:
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1. Plastic Bottle Greenhouse
Image Sources: goodshomedesign , ana-white , nteastdevon , audaxdesign , globalideas
Tutorial Here: ana-white
2. A DIY Cold Frame Greenhouse
Tutorial Here: ecofriend
3. Plastic Tent Greenhouse
Image Source: diysolargreenhouses
4. A Greenhouse Made from Cattle Panel Pallets
Tutorial Here: peakprosperity
5. Greenhouses Made from Old Windows/Frames
Image Sources: pinterest , 3dayblinds