The majority of fern species are non-poisonous.
Ferns (Pteridophyta) are non-flowering plants which thrive in little or no direct sunlight. Ferns come in a huge variety and require little attention to grow well. They are not only favored houseplants but are often chosen for the shaded areas of landscape where it is difficult to grow other plants. Ferns are believed to be among the oldest plants on earth and date back nearly 350 million years. As reported by the University of Nebraska Cooperative Extension, some of the wild species of ferns have shown some level of toxicity; however, all species of ferns which are used as houseplants are non-poisonous.
Fishtail Fern
Fishtail fern (Nephrolepis biserrata furcans) is a non-poisonous species of fern. The plant is tufted with feather-like fronds and reaches a mature height of 3 feet. Each of the leaf division ends is split in two. Fishtail fern is a native of Cuba and Australia and is well adapted to homes and greenhouses. The fern grows with no special care and medium levels of humidity. It is best to place the fern in bright, indirect sunlight. Use a rich potting soil which drains well but stays moist. Mist frequently with warm water and place the plant in a dish with pebbles and water to maintain consistent humidity.
Maidenhair Fern
Maidenhair fern (Adiantum pedatum) is a delicate fern with wiry, feathery, circular fronds with a fan-like growth. Maidenhair fern is a slow-growing plant which grows best in humus-rich, well-drained, moist soil. Place in a site with part to full shade. Sphagnum peat moss added to the soil helps to retain moisture and adds acid as it slowly decomposes. Propagate maidenhair fern by dividing its rhizomes in early spring when they are just emerging. Maidenhair ferns are often used as outdoor plants to give a delicate look to shade gardens.
Boston Fern
Boston fern (Nephrolepis exaltata) is among the most popular houseplant ferns and is also non-poisonous. The fern has frilly and long hanging fronds and thrives in humid climates. Select a site with bright, indirect sunlight for the fern. Boston ferns like an average daytime temperature between 65 and 75 degrees F with slightly cooler evening temperatures between 55 and 65 degrees F. In case the temperature rises above 70 degrees F, mist the fern daily. Place the fern in a dish or plate with pebbles and water, since this provides the regular humidity the plant prefers. Use tepid water for watering the fern, and use enough to keep the soil moist but not wet. If the soil becomes too dry, it affects the foliage color of the plant.
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