Leafy greens, like lettuce, kale and Swiss chard, are ideal for growing indoors. They can germinate in about two weeks and ready for harvest within four to six weeks. Vegetables like hot peppers and tomatoes are also great for indoor smart gardening. These grow tall, however, so make sure to choose the right kit with adjustable grow light. For herbs, you can try basil, cilantro, parsley, oregano, mint and chives. Some can even grow together in one garden kit to save space and enjoy plant variety.