can you use the non clear greenhouses? http://www.lowes.com/pd_318842-10155-FHSP300_0_?productId=3112005&Ntt=greenhouses&Ntk=i_products&Ns=p_product_price|1&pl=1¤tURL=/pl__0__s?Ntk=i_products$rpp=15$Ntt=greenhouses$Ns=p_product_price|1$identifier=$Va=29