That's one of the asparagus 'ferns', Asparagus plumosus (setaceaus). It's probably the most difficult of these plants to grow in typical indoor conditions, in my opinion.

Initial, it's Plumosis alright..do you have a cool, bright spot? They love summering outdoors, so if possible, set in a shady area, under a tree, or near an obstruction. Indoors, place in a bright spot to direct sun.
Plumosis, and their relatives Asparagus, Ming, and Fox Tail need similar care. Bright light, cool temps, some humidity. They dote on rain. After a storm, plant perks up.
Plusmosis aren't true ferns, they're related to asparagus. They need slightly acidic soil, with a pH of 6.1-6.5

Mine are rarely fertilized, 2-3 times a year with palm fertilizer. Epsom Salts every other month, too.
Don't let soil dry, otherwise fronds yellow and drop, but roots shouldn't sit in soggy soil either.

Plumosis grow into beautiful, large plants. One reason I rarely fertilize is, unless you plan on tossing, if given regular feedings the plant will outgrow its pot in no time. They need constant potting anyway, so if given monthly feedings, you'll end up repotting every few months, especially during growing season.

Plumosias look great hanging before a sunny window. They stand out, especially when stems grow long, near the ground.
In autumn, they produce white flowers and green berries..After a time, berries redden. Good luck, Toni

thanks for the info guys, but I have a question, when do I repot? my plumosias never grew white flowers or berries, is my plumosias young or there's a problem with it? when is their growing season?are the berries edible?