How does one take care of an asparagus fern inside? I put it in many of my outdoor containers as it adds a soft filler that goes well with every plant. I’m sure you do, too, though they aren’t as popular as they used to be. There are so many more choices these days, but did you know that they make great houseplants?
A history of the asparagus fern.
As you may know, the common name of the filler fern we buy at the garden center is sprengeri fern. Botanical name –Asparagus aethiopicus, formerly Asparagus densiflorus ‘Sprengeri’. (They are always changing names). It was named for the German botanist, Carl Ludwig Sprenger (1846-1917). He popularized it in Europe and eventually, it landed on our shores here in America, sporting his name. It is native to South Africa.
Is it a true fern?
If you didn’t know, this plant isn’t a fern at all. Because of its frothy appearance, it does resemble a fern but is not related. It is in the Asparagaceae family. And yes, it is related to the edible asparagus (Asparagus officinalis). You can see the resemblance in the picture below of a new shoot of a Ming asparagus fern.
The asparagus fern roots
As your asparagus fern ages, you may find that the roots will rise out of the potting medium. It may push the plant up out of the pot, too. Your plant needs a larger pot, so it is time to up-pot. There is no more room for their roots.
I brought one home from our garden center last week. You can see from the pictures below, this plant is ready to burst out of its pot. I had to cut the plant out of the container. It was stuck.
Look at this ming fern at Graye’s Greenhouse in Plymouth. Look at those roots coming out of the container they used. So cool!
The “leaves” of an asparagus fern
The needle-like leaves are modified, flattened stems called cladodes or phylloclades. The definition of a cladode is “a flattened branch or stem-joint functioning as a leaf”. They aren’t leaves or needles. They are photosynthesizing and making food for the plant. Beware, the stems of asparagus fern have sharp thorns. Handle with care.
Does the asparagus fern flower?
Yes, the asparagus fern does flower. As you know, true ferns do not flower but instead produce spores to reproduce. The asparagus fern produces small white flowers, which turn into red berries. They are pretty but toxic, so keep them away from kids and pets. I have read they are easy to grow from seed, but I haven’t tried. Have you?
Up-potting your plant
Because the roots of the plant I brought home were so rootbound, I did up-pot it into a pot larger than I normally would. A 2-inch plant usually moves to a 4-inch pot, and a 4-inch plant into a 6-inch pot, and so on. Knowing how this plant grows, where I was going to place it, and how rootbound it was, I used a 6-inch pot.
First, I teased the roots apart as the root ball was so solidly packed together. Using a well-drained potting medium, I up-potted it to a 6″ container.
Asparagus Fern Care
Place your asparagus fern in a medium to bright light. If your plant is in too bright light, the plant will turn yellow. I saw that first hand. The plant I brought home from the garden center is quite light green, almost yellow, and it was in full sun.
I have an Asparagus setaceus plumosa in my bathroom, it gets no direct sun, and is a nice dark green. It hasn’t grown a lot, but I’m okay with that. The west window is on the wall to the right in the picture below. If it were in the window, it would probably grow more and start to vine.
Give it a good, well-drained potting medium and make sure it doesn’t dry out. It will drop its needle-like leaves if allowed to dry out. Its tuberous roots, which you can see above, do hold water, so it can survive even if it loses a few stems. Even if cut to the ground, it may sprout back out. I did this when one of my plants got a bad case of mealybugs, and it came back.
Relatives
Though the “regular” asparagus fern is the easiest of the family to find, there are others I like much better.
Plumosa Fern
My favorite is the Asparagus setaceus plumosa or plumosa fern. I love how the leaves (phylloclades) are flat and the plant stems are layered. You see the layers in the one I have in my bathroom in the picture above.
I especially love it in this mixed container at the Franklin Park Conservatory in Columbus, OH. Look how it is starting to vine down the side of the container.
Pyramadalis Asparagus
I also have one called pyramidalis. I almost killed it by letting it dry out one too many times, but up-potted it and kept it moist, and it has taken off. It sent out a vine that was over 10 feet long.
Below, you can see that I had cut the resulting dead stems off after I allowed them to become too dry. I should have trimmed them lower so they weren’t visible. In the picture on the right, I have cleaned up the dead stems out of my Asparagus pyramidalis.
I’m sure you noticed that something weird is growing in my asparagus fern. It is a true fern, a bear’s paw or blue star fern, Phlebodium aureum. A spore must have landed and grown as they were near each other, and I did not plant it. I can’t bring myself to rip it out, but should split the plant and then cut it out. Update to come if I decide to do that.
Ming Fern
I also have the ming fern or Asparagus retrofractus also called pompon fern because of its phylloclades are in clusters. I love this one, too.
Foxtail Asparagus
Below is the foxtail fern or Asparagus densiflorus ‘Meyeri”. (I’ve also seen it as Meyersii, and Meyers). I love this fern, but I gave up because it never stays looking like the one on the left in my home. It needs more light than I can give it to keep those tight “foxtails,” so I enjoy it outside in the summer. Has anyone else had luck keeping its foxtail shape inside?
Asparagus fern care isn’t complicated, and I hope this helps you care for your asparagus fern, and if you don’t have one, try one. You can find them in the “accent” clearance at your local garden center at this time of year. They are easy and beautiful! Do you keep any of them as houseplants, or do you only use them outside in your containers? Let me know in the comments.
Have a great week, plant friends.
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Very good information. Thanks
Thanks, Rutu!
I have a huge one very rootbound, spiraling into a huge knot being about 12w x 20D, it cannot be pried to divide! Should I chop it in half? Is it ok to cut the bottom of the rootball off??
You can definitely cut the bottom off if needed, especially a this time of year as the plants are taking off and growing like crazy. They can become extremely rootbound, for sure!
Lisa
I have a ming fern that is doing wonderful however its getting I guess you would say leggy. I’ve got all kinds of sprouts coming off it. This plant is indoors, how should I handle the sprouts to have a full shaped plant?
That is how they grow, but I think you could cut it back to keep it fuller.
Have you experienced the asparagus fern getting very very long stems suddenly? As in more than 1.5 meter but not getting any leaves out to the sides?
What could cause this and why does it do it, would love to know as it looks very funky 🙂
Yes! They do eventually get leaves. Keep watching it.
I have a a very tall plumpest fern which the stems are bare. It is unruly how do I cut it back to get it bushy and full. Thank you
Could you send me some pictures via email? I’m not sure what you mean my tall plumpest fern….
Great webpage. I have a Sprengeri fern. I sends out those incredibly long shoots seemingly overnight. Not sure why. I love how they look and trail. Is it ok for the plant to have the combination of clipped stems and long shoots or is it best to cut them back?
Hi Jean,
I think it is your choice. I’ve seen them as long vines and as plants that are kept trimmed back. I kind of like the “viney” look, but its all up to you.
Lisa
Is it normal for Asparagus pyramidalis to vine like that? Mine started doing something similar and I wasn’t sure if it was due to too little light/water or if it needed re-potting!
Yes! I love mine. All the asparagus ferns become vines. Watch out for the thorns!
Would this be a good plant for a closed terrarium? I bought it thinking it was a normal ferm and am now worried about the humidity level.
Also what kind of soil do you use? I usually make my own.
I’m not sure about an enclosed terrarium. As they begin to vine, it would be hard to keep them contained. I also mix my own soil. I use soils I order wholesale through my husband’s garden center. I mix a potting medium with perlite and vermiculite. I want my soil to be fast-draining soil.
Could you post a picture of how you cut the roots? My ming fern has a lot of “root tubers” (I guess that is what they are but maybe only 4 5 stems at a time. I took it out of the pot to repot – there was still a lot of potting soil in the middle and around the top – about 1″ or more on the sides and maybe 3-4″ in the middle of the bottom. The top had exposed tubers so I thought it was rootbound. I use the stems for cut flower arrangements so the plant does not have to be “beautiful” but I wish I had more stems!
Hi Dodie,
I actually pulled the roots apart more so than cutting them. I think I did cut the pot to get the plant out. I didn’t want to cut the large tubers, so if you can, try to pry them apart if you can. Lisa
I have a plumosa, 50+yrs.old. It was beautiful. One day, I thought it could use more light as a few fronds turned yellow. So I put it in the sun, protected by another pant. When I brought it back to it’s usual place, the needles turned yellow. They were falling off, so I cut the stems way back. Have I killed this plant?
Hi Dawn,
I have cut off an asparagus fern at the soil line before and it did come back so I think yours will, too. It probably turned yellow coming back in because it needed to be acclimated and came from the sun (even though it was shaded by another plant, that is still more sun than in the house) back into a dimmer place and reacted by dropping needles. Let me know how it does. Lisa
From CL Sprenger’s writings it is clear that one of the many disasters that befell him was that Moellers Deutsche Garten-Zeitung claimed that his Asparagus fern was the same as Asparagus falcatus. It seems that Sprenger won a legal case against Moeller over this.
This is the picture that emerges from CL Sprenger’s writings but I am unable a) to locate the “defamatory” article in MDG-Z nor b) to locate the documents regarding the related legal case. Can you help?
Hi Andrew, That is so interesting! I did not know that and so can’t help you, but thanks so much for sharing that information. I love the history behind the plants! Lisa
Lisa ,thank you for all the beautiful photos of your ferns, especially the plumosa. I have one that is going crazy right now after spending the summer under our elevated deck. So the long vines will continue to grow? Oh my! He is going to have to move out of my shower, he can’t stay there all winter. The best window for fernsin my small house is occupied by my other large “regular” asparagus fern. I have planted the berries from that plant for a couple of years now . I save the red berries that fall off or pick them and let them dry out. In the spring I plant them. Each seed turns into a rhizome. This past spring I had more seeds than seed pots. I threw a handfull in a spare pot with some leftover soil and they all sprouted!. I mix the baby ferns with impatiens and coleus for flower arrangements .They make nice gifts.
Hi Kathy, The vines will continue to grow. I had one that was many feet long. I think it awesome that you grow them from seed. I need to try that! Thanks, Lisa
Hi Lisa,
I’ve just moved my 2 Asparagus ferns to a slightly warmer spot, out of the direct sun, as they have gone yellow/ brown in places, and they are dropping their little leaves . Should I prune these yellow brown stems?
Also, should I be misting them?
Kindest regards,
Jo
Hi Jo, I find mine do better if they aren’t in full sun. They will drop some of their leaves and I just cut those pieces off and vacuum up the mess. It will do that less if it is never allowed to dry out.
Lisa
Does the plumosa variety also get the red berries? I’d like to have one indoors but I have cats.
Hi Heather,
I would assume it does, but I never have personally seen that one bloom like the others. Sorry I wasn’t more help.
Lisa
Hello, Houseplantguru:
I need your help. My asparagus fern just sprouted a new stalk and it is already yellowed. My home has water damage, so I can only keep in on my dryer upstairs right now. It has a blue light plant light positioned above it and it has been turning toward it, but now I see that the new shoot is yellow. How can I save my plant? Desperate to save it, as it is 26 years old now. Thank you for your help.
Hi Ren,
Do you think it is too warm on the dryer? Has it dried out? I think I would try to move it outside in a shaded area if you can or maybe move it when the dryer is going? Or is it rootbound? These are things to consider. I hope it is just losing a stem from the stress of the move and will rebound. I just had an asparagus fern that I completely cut to the ground and it has resprouted with a few leaves already.
Lisa
my asparagus fern is almost all rhizomes – very little dirt and only about 3 stems. Can I cut the roots and repot or will it kill my fern?
Hi Wendy,
I’m sorry this is so late. My daughter had twins and I haven’t been on my website in over 11 months. I would repot it in a bigger pot all together or split it if you want more plants.
Hope your plant is doing well.
Lisa
I have a 2.5 meter tall asparagus retrofractus about 40 years old. It is growing out of its big pot, and there is hardly any soil left. I water it once a week. I would like to remove something like 25% of the roots around the edge, and in the bottom, before putting it back into the same pot. Can I do that? How do I prune the roots of this old plant? Is there other measures I should take? Can I split the plant in two? If I cut off pieces of the root, can I plant them again?
Hi Viggo,
You can do any of the things you are mentioning. I may just put it in a larger pot without cutting it, but you can do that, too. It’s up to you. I haven’t ever cut pieces of the roots and tried to propagate them so I’m not sure of that. You can try it. Why not?
Let me know how it goes.
Lisa
At the botom of my plant there are many dried cutted stems what should i do about that
Hi Sheza,
I have the same thing. I use small clippers and try to get in among the stems and cut them out. It may be tricky, but worth it.
Lisa