The Aero Garden ($150) lets you grow herbs and vegetables in your house without any dirt. Using Aeroponics technology, the plants grow in just water and air, and are ready to harvest in less than a month — up to five times faster than soil. The kit comes with everything you need (just add water!), including a salad greens seed pack. Also available are packs for gourmet herbs, cherry tomatoes, and international basil.