brinjal eggplant nursery Solanum melongena Vegetable saplings agriculture backyard baingan farm green Green Brinjal India Karkala karnataka leaves plant produce Solanaceae vegetable aubergine berry cultivars elongated oval-shaped food fruit glossy guinea squash healthy melongene nightshades nutritional oval-shaped perishable purple shapes smooth spongy texture taste texture textures variations variety vegetarian elongated elongated-oval-shaped white aubergines guinea-squash Solanum-melongena spongy-texture striped appearance appearances color colour droplets drops moist moisture sprayed surface surfaces wet