planting in the ground vegetable gardening in a greenhouse. insulate your harbor freight greenhouse for the winter. cheap snap together shelves and shop lights make for a reasonable indoor greenhouse and you. vertical garden river greenhouse. i grow carrots in boxes that can be kept in an unheated greenhouse, or your house, during the winter months if necessary. crops growing in rows inside of a hoop house. greenhouse gardening. protect your garden. cold frame greens. as garden centers go, portland nursery serves a huge population of gardeners in the portland area, especially with two rather large locations.