Grow hydroponic lettuce indoors. These seeds are a mixture of different lettuce so you get variety from your harvest. Cut and grow again up to 3 times before replacing with new seeds. Lettuce mix seeds included: Red romaine, green romaine, red oakleaf, green oakleaf, red leaf lettuces, lollo rossa Can harvest baby leaf or full-grown. Ideal full harvest is around 40 days. Spread liberally and cover, germination is around 3 days. The Hydroponic Mason Jar Garden is an easy to use, self-contained hydroponic system that is perfect for the beginning gardener. It is a great way to get started with hydroponics and requires little maintenance. The kit comes with all of the components you need to start growing plants: a 16 oz Mason Jar, protective cover, bamboo plant label, net pot, clay pebbles, non-GMO seeds, growing pod, dry nutrient mix, and directions.