Q&A for How to Care for Boston Ferns

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  • Question
    How often do Boston ferns need to be watered?
    Maggie Moran
    Home & Garden Specialist
    Maggie Moran is a Professional Gardener in Pennsylvania.
    Home & Garden Specialist
    Expert Answer
    They need to be watered enough to keep the top of the soil from drying out.
  • Question
    Do ferns need a lot of sunlight?
    Maggie Moran
    Home & Garden Specialist
    Maggie Moran is a Professional Gardener in Pennsylvania.
    Home & Garden Specialist
    Expert Answer
    It depends on the type of fern. The majority of the ferns out there do great in partial shade or casual sun.
  • Question
    Why are the leaves on my Boston fern turning brown?
    Maggie Moran
    Home & Garden Specialist
    Maggie Moran is a Professional Gardener in Pennsylvania.
    Home & Garden Specialist
    Expert Answer
    The leaves on your fern may be turning brown due to bad soil, poor water drainage, or too much sun.
  • Question
    How much sun does a Boston fern need?
    Maggie Moran
    Home & Garden Specialist
    Maggie Moran is a Professional Gardener in Pennsylvania.
    Home & Garden Specialist
    Expert Answer
    The amount of sun needed by these plants varies based on what the time of year is. During the fall months, they like indirect light.
  • Question
    What kind of light should my Boston Fern have?
    Melinda Meservy
    Plant Specialist
    Melinda Meservy is a Plant Specialist and the Owner of Thyme and Places, a botanical boutique offering plants and gifts in Salt Lake City, Utah. Before starting her own business, Melinda worked in process and business improvement and data analytics. Melinda earned a BA in History from the University of Utah, is trained in lean and agile methodologies, and completed her Certified Professional Facilitator certification. Thyme and Places offers indoor plants and containers, a fully stocked potting bench, and tips on plants to suit your space and lifestyle.
    Plant Specialist
    Expert Answer
    Your Boston fern will likely do best in low to moderate indirect sunlight.
  • Question
    Is morning sun okay for Boston ferns?
    Maggie Moran
    Home & Garden Specialist
    Maggie Moran is a Professional Gardener in Pennsylvania.
    Home & Garden Specialist
    Expert Answer
    It's actually preferable for Boston ferns to be in morning sun. They need at least two hours of indirect sunlight each day.
  • Question
    What are the pebble like pods in the roots of the fern?
    Maggie Moran
    Home & Garden Specialist
    Maggie Moran is a Professional Gardener in Pennsylvania.
    Home & Garden Specialist
    Expert Answer
    These root nodules are simply part of the fern. They not only help the plant propagate itself, but also help in the absorption of water and nutrients.
  • Question
    Why are my new fern leaves turning white?
    Maggie Moran
    Home & Garden Specialist
    Maggie Moran is a Professional Gardener in Pennsylvania.
    Home & Garden Specialist
    Expert Answer
    This problem is generally related to under watering. It is recommended that you thoroughly water the plant until water runs out of the bottom of the pot, being careful to not water again until soil is dry to the touch.
  • Question
    Can a boston fern survive outside?
    Community Answer
    Yes. Just avoid direct sunlight -- try to keep them moist and shaded.
  • Question
    Could I take a large Boston fern indoors for the winter? It is outside in a pot.
    Community Answer
    Yes. If your house is dry, you must mist them occasionally, and never let the soil become too dry.
  • Question
    Will Boston Ferns improve air quality in my home?
    Community Answer
    Yes, they will. Plants use certain air pollutants that we can't use to support their natural biological processes.
  • Question
    What fertilizer do I use for Boston ferns?
    Community Answer
    Purchase houseplant food at your local gardening supply store. Read the instructions on the packaging, and dilute it so that it is half as strong for your fern.
  • Question
    What is the lowest temperature ferns can tolerate?
    Community Answer
    Boston ferns die if exposed to temperatures lower than 30 to 35 degrees Fahrenheit, or -1.1 to 1.7 degrees Celsius.
  • Question
    What are the brown spots on the underside of each leaf on the fronds?
    Community Answer
    If they're dark brown/black spots lined up in rows, they're spores that allow the plant to reproduce and will eventually fall to the soil and grow.
  • Question
    Will Boston Ferns survive the winter if I cut them back and plant them in the ground?
    Community Answer
    Boston ferns can survive mild winters, if the temperature doesn't dip below 30 to 35 degrees Fahrenheit, or -1.1 to 1.7 degrees Celsius. The plant will basically go dormant, like a hibernation mode for plants. Try to give it a bit of shelter or protection, and prune it before winter hits.
  • Question
    Are they poisonous to cats?
    Community Answer
    No, Boston ferns are not poisonous to cats. However, cats can still become ill if they eat Boston ferns, so it's best to limit this.
  • Question
    Why are there long strings coming from my fern?
    Community Answer
    When the leaves fall off, the stem that they grow on remains. That's what you're seeing. Look closely at the leaves that are still there and you will notice the stem.
  • Question
    How often should I water the leaves of a Boston Fern?
    Community Answer
    It's a good idea to give the fern's leaves a little extra moisture. You should spray them every few days, in addition to the typical watering of the roots.
  • Question
    I have black worms with yellow stripes on them on my ferns. What are they?
    Community Answer
    These may be fern caterpillars. You can remove the ones you see by hand. The top recommendation to prevent these is to create a spray of pyrethrum powder, which is typically found at gardening and home improvement stores, and some laundry soap. Spray it on your plant and observe.
  • Question
    How do I keep my ferns luscious and green if they're outside?
    Community Answer
    Make sure that you keep the soil constantly moist, and that humidity levels are over 50%. Place your fern in indirect sunlight, and bring it inside if the daytime temperatures fall outside of 65 to 75 degrees Fahrenheit (18 to 24 degrees Celsius), or if the night temperatures fall outside of 55 and 65 degrees Fahrenheit (13 to 18 degrees Celsius).
  • Question
    What kind of sticky substance is on my fern?
    Community Answer
    Sticky substances on fern leaves are typically left from insects. To get rid of the insects, you can try spraying your fern with water in order to physically remove them. If you continue to notice the substance, spray your fern with a mild insecticide or a natural insect repellant.
  • Question
    My Boston ferns are lush and healthy but the fronds aren't long. How do I get long trailing fronds?
    Community Answer
    Honestly, from the sound of it your plant is simply still too young to have long fronds. Give it time. This is one of the simplest plants to grow as long as you give it enough indirect sunlight and don't over/under water it too often.
  • Question
    Will my Boston ferns survive sudden freezing temperatures in an open air setting with a roof over them?
    Community Answer
    Probably. They don't like frosts and can die down to ground level, but can grow back in the spring. Try to bring them indoors and let them rest over winter.
  • Question
    The fern is growing out of the bottom of the pot, do I cut this off?
    Community Answer
    No; it has outgrown its pot. You need to replant it in a larger container and add potting mixture to finish filling it.
  • Question
    What are the long hairy branching strands with no leaves?
    Community Answer
    They are air roots. The more there are, the better it is for your plant.
  • Question
    What are the long strands with no leaves on them? Do I leave them on the fern?
    Community Answer
    Those are strands that used to have leaves. The leaves die and fall off, but the strand stays.
  • Question
    Should I cut off the long stems?
    Tamara Adams
    Community Answer
    Yes. It's a good idea to trim back the old "branches." You should typically do this during the growing season to make room for new growth.
  • Question
    Should I not use tap water to water my Boston ferns?
    Community Answer
    Tap water is OK, as long as you let it sit out for a few hours first for the chemicals to evaporate out. Just be sure to avoid softened water.
  • Question
    Can I pull out the strands of boston ferns?
    Community Answer
    Do not pull the ferns out as it can do damage to the root ball. If leaves become discolored or die, cut them with sharp scissors as close to the roots as possible.
  • Question
    What are the long thread like strands on my boston ferns? Should I cut them off?
    Community Answer
    Those are leafless fronds. Those are normal on new plants and should be cut off to allow for new growth.
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