Greenhouses extend your growing season and provide controlled climates and soil conditions for plants. The type of plants you want to raise and their size determines the size of your greenhouse. PVC tubing is a lightweight construction choice that makes putting up the greenhouse. When looking for an easy solution for your greenhouse desires, your best bet is to build greenhouse using PVC. Greenhouse using PVC pipe reinforced with rebar, you can quickly build a greenhouse. This type of greenhouse is relatively secure, but not considered a permanent structure. In areas with mild winters, you can safely grow many plants in a greenhouse like this all winter long. In areas with more severe winters, this type of a greenhouse is erected directly over the garden and can be used to extend the growing season in fall or start it earlier in spring.