In a world where over or under-watering can be deadly, shouldn't there be a way for a plant to decide how much water it gets for itself? Enter Modern Sprout's passive hydroponics, which allow plant roots to suck up exactly the amount of moisture they need — no more, no less. Spend five minutes setting up the handsome terracotta planter and you'll have aloe, bonsai, palm, spruce or cactus plants growing themselves in weeks.