While there are a number of houseplants that are not toxic to children and pets, even the least toxic of houseplants should never be eaten. Houseplants can cause unexpected allergic reactions, and are also occasionally treated with systemic pesticides that can linger inside the foliage for more than one year. Thus, it is important to keep houseplants away from anyone young or furry enough to consider eating them.
Tradescantia, also called "Wandering Jew," is an easy non-toxic plant to grow, only requiring bright light and consistent watering during the growing season to perform well (reduce water in winter). They trail over the sides of a pot and so are good candidates for a hanging basket or for setting on a pillar or table.
Wandering Jew is available in a variety of foliage stripes and colors. Tradescantia 'Tricolor' is striped with white, pink and green; while T. 'Quicksilver' is white and green striped. T. blossfeldiana 'Variegata' has larger leaves, colored stripes and purple leaf undersides.
The blooms on most indoor Tradescantia plants are insignificant in size.
Prayer Plant is non-toxic and has a tropical appearance with brightly veined and striped leaves. It's called Prayer Plant because it folds and raises its leaves at night.
It is moderately easy to grow if given partial shade indoors; Maranta burns in direct sunlight and the colors fade in too bright of light. Prayer Plant enjoys humidity, so mist leaves regularly.
There are a number of varieties available. Maranta leuconeura 'Tricolor' has red veins and and wavy golden midrib or line down the center of each leaf. M. leuconeura massangeana has blackish-green leaves with silvery white veins. M. leuconeura kerchoveana is also known as Rabbit's Tracks because it has light green leaves with brown splotches down each side like rabbit footprints.
Spider Plant may just be the easiest houseplant to grow, and it is non-toxic. It is adaptable to either bright or shady rooms and asks only that you water it regularly. It doesn't mind dry air, though it will be especially happy if you mist it occasionally in summer.
Spider Plant or Chlorophytum has variegated, arching leaves that hang over the sides of pots nicely. It is also exceptionally easy to propagate, because in summer after a flush of small white flowers, Spider Plant produces a number of tiny plantlets that can be replanted to create new plants.
Boston Fern is a loosely-growing fern with somewhat droopy foliage that hangs attractively over the sides of a container. Despite what most people think, ferns growing indoors actually prefer bright indirect light, not shade like they do outdoors.
Boston Fern appreciates regular watering from spring through fall, and slightly less water in winter. Mist it occasionally during the growing season, because they enjoy humidity. Boston Fern is non-toxic to people and pets.