Mainly constructed of PVC pipe and plastic sheeting, hoop houses are simple structures that have no windows for ventilation, and no electrical fans to move air.
Hoop houses create good environments for seed starting. By starting seeds in a constant environment, vegetables and plants tend to grow more quickly, with more seeds making it to sprout. Leaf lettuce seeds can be started in barrels or containers in the hoop house, and kept there during their growth. Other vegetables can be started in small cells or trays, and transplanted outside in the ground once they have successfully sprouted.