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Natural ventilation augmented cooling greenhouse. an alternative approach to cooling and ventilation in hot climate greenhouses. patented in usa, canada and australia.. Greenhouse design, type and quality of the plastic covering material, fertigation, mulch, use of high-yielding hybrids and cultivars, plant training and pruning techniques, integrated pest management, the use of pollinator insects, climate. Greenhouse polypropylene is the least expensive material we recommend for your greenhouse. "poly" is graded by how many years it is expected to last in the full sun, and by how thick it is. four-year, six mil (mm) thick poly is ideal for most greenhouses..
