Adiantum — 30 species

Adiantum, the maidenhair ferns, are delicate, fan-frond beauties found from the tropics to temperate woodlands. Species range from compact Delta maidenhair (A. raddianum) to the stately Giant Maidenhair (A. formosum). All demand bright indirect light, consistently moist (never waterlogged) soil, and high humidity — a bathroom windowsill or pebble-tray setup suits them well. Toxicity varies across the genus: some species are listed as non-toxic by the ASPCA while others lack confirmed safety data, so check each species individually before purchasing for a pet-owning household.