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Colocasia esculenta
Colocasia as well as its close relative,
Alocacia, is a tuberous bulb plant growing from 3 - 5 feet. Generally
they are grown outside in semi-tropical and tropical areas. They can be
grown in northern areas but must be dug up for the winter months. This
is a very showy, back border plant. They perform best in shade and must
have good drainage.
They are fun plants for children because of their fast growth and large, veined leaves. It will grow nicely in larger containers. Be sure to fertilize regularly. They do well in rich and organic soil. In areas where they must be taken up for the winter, keep the tubers dry while dormant. Divide in the spring when setting out. If in doubt as to which end is the top when planting the bulb, plant sideways.
Soil and Water Zones In Florida, on the border of zones 8 and 9 they did well and survived year round in the ground. If we got a light freeze at night, the fronds went mushy and drooped and would not come back. However, new growth started immediately. However, when we lived on the border of zones 7 and 8 in South Carolina they would not survive the winter in the ground except in a warm micro-climate. Yellow leaves
These leaves can be picked off and disposed of if they are unsightly. Size We do not know what the record might be. We have seen elephant ears that are probably at least 12 feet tall. This was in Jacksonville, Florida. The books that we have for references state heights between 6-8 feet. The more the mature the bulbs are and the more protected it is, and the longer it has grown in one location, the better chance those bulbs will produce a huge elephant ear. Fertilizer A regular fertilizing every month is good during the growing season. A balanced, 20-20-20 fertilizer is fine. A water-soluble kind such as Miracle Grow or Peters is fine.
Dividing / propagating Dividing the Elephant Ear is easy, just dig it up (dig far enough away from it so not to damage the roots, say 8 to 12 inches) and pull the roots apart into three sections. This is messy. Also, you might think, "there are no roots here" but there are. Then, just repot them (or, replant them) in similar soil. Be prepared for them to droop for a while. This is sometimes not successful, but that is the chance you take. We would not hesitate. With mulching and fertilization, the bulbs should produce bublets off the sides of the main bulb form the previous season. When digging up in the fall one can divide any bulbs at that time and store for the winter season in a dry cool place. Or wait 'til the spring when you plant again and then divide. On the other hand, if they remain in the soil year round, divide them in the spring and spread them around. Fertilize well and mulch and they will grow faster. If it is dry for a week or two after you replant them, supplement with some extra watering. Planting the bulb If you are lucky, and your EE bulb is already sprouting, stick the top pointing up. We often suggest planting sideways because it is hard to tell the difference between the top and the bottom. Plant deep enough to cover just below the tip. Most bulbs are planted at a depth of one and a half times their length. Make sure you have plenty of room for growth, fertilize once a month during the growing season, mulch and enjoy. Do not overwater at this stage. Bulbs do rot. When in doubt if the leaves start to droop you may need water. Always check the soil to assure that it is moist.
Cut off the large leaves and leave just a stem to help plant the bulbs next spring. Dry off the plantings. Trim the tops off. Store in a warm dry area, insulate, and cover with peat moss/vermiculite/ or sawdust. Something that will keep the roots dry. Storing elephant ears or any bulbs sometimes is a tricky process. Any chance of temperatures below freezing will mush the bulbs. Dig up the elephant ear bulb IF it is not in a very protected area. If you have a microclimate and plenty of pine straw mulch to insulate the bulb, you may want to chance it. Sometimes in the wet of winter and if there is not good drainage, you could get a very soggy/mushy bulb and it may rot away. If you live in a very cold region, we would suggest you dig up the elephant ears and take them inside for the winter months. We do not believe a container will be sufficient protection. Containers usually get even colder than the ground. You can bring the entire container indoors for those winter months. You can leave the bulb in over the winter, probably in zone 8 or warmer. We lived in SC and did not dig our elephant ear up and it did just fine. It was, however, in full sun on a hillside and had somewhat good drainage. Putting out in spring When we lived up north (NH, NY, VA) our rule of thumb about when to put the houseplants out was after we had turned the heat off. We did not want to shock the plants going from our heated house (even at 65 degrees) to the outdoors (45 degrees). Therefore, we would wait until it gets into the mid-50s. When we were in Northern Florida, the Elephant Ear stayed outside all year long and did great as long as it did not get to freezing. IF it did freeze the leaves mush up and droop but it generated new leaves very soon. Planting elephant ears inside before the season is a great idea. A good way to get a jump-start. You may have to wait up to 4 weeks before you see a sprout tip. However, make sure you do not overwater. Give it the best light you can and warmth from the bottom. Elephant Ears love heat. Place outside as soon as you feel you can without danger of cold nights. Transplanting In the process, if it loses the lower leaves / stems they can survive that, too. If you are not sure how much moisture err on the side of wetness. We've planted in a pot right in the water before (although most of ours grow in the sandy soil. With the weather in the summer, the plant material will wilt. Make sure they are mulched and it may take a week or so before they perk up. Some leaves may die back, just trim. Transplanting in the middle of the summer is always hard on plant material. It is a shock no matter what. Do not over water; just check every few days. Do not fertilize. As a House Plant If you can simulate a tropical condition in your home, you may fool it into thinking it is in Florida and it may grow all year long. There are several varieties and some do better than others indoors. How do I control and
eliminate? We usually reply: "Keep pullin' " In Northern Florida we had many volunteer plants all over the yard. They seem to avoid areas where there is intense sun for more than a few hours a day. All you really can do is just pull up the bulb. We have pulled up a lot where there does not seem to be a bulb. As long as it is shady, humid, and wet they seem to thrive. Sharing is a good way to get rid of them. Chopping as much as you want is ok too. They are propagating underground ! Some are probably more of a rhizome than a bulb. We suspect you will not harm them by digging them up. Pot them up and see how they do for a couple of weeks in the pot. If they perk up and seem healthy, we pass them on. Poisonous Some elephant ears may be poisonous and others (taro, that are sometimes considered in the elephant ear family) are not. One would have to know the variety of each kind of elephant ear plant to know the specific dangers. We would never test any plant just to find out. We own elephant ear plants and have two cats that are in and around them all the time. There has never been a problem. (But on the same time they do chew and nibble on our spider plants.) We would also teach all children never to eat anything in the flowering garden. See our readers' comments on eating the Elephant Ear plants (just below). Elephant Ear Questions (on page 2) Elephant Ear Letters: A letter from a reader in Indiana: We've had an elephant ear for 6 years that I thought you and your readers might like to know about. We planted it in fertile soil and have repotted it three times. It now is 8' tall, has a 4" stalk and seven leaves, three of which are near 3' by 2' wide. A new plant or what we thought was a sucker grew this past fall (I never knew that they were not normally grown inside). It now has four leaves and just this week out of the middle of the mother stalk a 7" bud is emerging. We didn't know they even bloomed! We live in northern Indiana and have drug it in and out of the house each fall and it's been fine. I don't think it's grown much in the winter but when we've repotted it's loved it and grown like crazy. Originally, it had only two leaves, about 7"-10", and for at least a year every time a new leaf would grow, one would die. I thought for the longest time that we'd never have more than three leaves. But when it got past four without dying it just kept adding more leaves and it took a lot longer before one would die. Just this spring we put some packing peanuts in the bottom of the 2' by 2' pot we have it in (it makes the pot lighter!!) along with some dead leaves and organic and plant soil. It has rewarded us with these even bigger leaves and now this new bud. We're so excited I just wanted to share all this info. After going on line to find out about the buds and what to expect, we only saw the picture that you have. I missed seeing any comments about the buds or how often we could expect them. However, I did want to encourage other readers that they do okay inside. We have a great room with huge windows that all face southeast and several chapel windows that allow light in from the west. It sits in a southeast chapel window in the great room all winter near a heat duct that is several feet away on the wall. We must be doing something right because it really likes us and we are thrilled to be seeing a blossom from our bud soon. If you could tell us more about the blossoms, we'd appreciate it. Thanks and good luck to all EE growers out there. Ft. Wayne, Indiana Another letter from a reader: Hi, Emily! I chanced on your very informative site when I searched for poisonous plants. When I saw elephant ears in the list, it led me to your site. I feel I can tell you more about this plant that you may not be familiar with... as food! I come from the Bicol Region in the Philippines. Elephant Ears are a delicacy to us. We eat every part of it! We cook the leaves and stems (fresh and dried) with coconut milk. We boil the root (with water or coconut milk with sugar) for snacks even. It has this very, very slight tingling sensation in the tongue sometimes (not all the time). We think it was because we stirred it too much while cooking. However, if you are peeling the root (or should I say rhizome?) wet, any skin that gets in contact with it will itch like anything! It has a clear sticky liquid that causes the mild irritation. It doesn't give you any rash or anything (unless you scratched and scratched and broke your own skin). We just leave it and try not to scratch until the itch goes away. Rubbing alcohol helps mask the itch. It is a great source of starch just like Cassava (Tapioca) which I heard is also very poisonous. However, it is a delicacy to us because we cook/eat the leaves and roots too! Of course, that is another topic. Elephant ears grow everywhere, mostly in swampy and wet areas. Some in canals even. There are different varieties of this plant. I have eaten most of them. People that came from the Philippines who live in the USA and Europe (like my aunt - she was in Germany and now in the US) have planted this plant (mostly in pots) more for eating than for ornamental purposes. I miss this plant! I am not encouraging people to eat this plant if they are not familiar or unsure of it at all or if they have not experienced it. I didn't even know it was toxic since I had been eating this plant as a baby! It is still best to be warned about the toxicity of this plant. To all Elephant Ears lovers, may all your plants propagate well. Faerie PS: I find your site very interesting as it features plants not common in plant catalogues or common plant internet site... You even feature weeds!!! I think that is so cool! I always find these plants very interesting as I didn't know some grow well here (in the USA), too. I just would like to add more info to some of your plants... Blackie Potato (we eat the leaves,
tender stems and roots/tubers)...
Emily's note: Okay, so don't try eating this at home. "The American Horticultural Society's A-Z Encyclopedia of Garden Plants" lists the Colocasia as the Taro and the Alocasia as the Elephant Ear. Both very similar species. It says about the Colocasia, "All parts may cause mild stomach upset if ingested without cooking, and contact with the sap may irritate the skin." It basically says the same about the Alocasia which seems to have a more deeply veined leaf. "Botanica" says about the Alocasia (elephant's ear), "Closely related to the taro (Colocasia), the roots of some species are edible, but most contain poisonous crystals which cause numbing and swelling of the tongue and throat." About the Colocasia: "At least two Colocasia species are grown for their edible tubers..." A letter from a reader in India. We thought you elephant ear fans would enjoy this letter, but we are telling you: DO NOT EAT THIS PLANT! (I thought I had problems when Mom made me eat my spinach.) I come from south Karnataka in India. We call it Tev back home (Rhymes
with brave) and Arbi in Hindi. I have a phobia about this plant as when I
was a kid, mom had prepared the tubers as a curry. I had severe itching in
my throat, as if a hundred tiny needles had embedded in my throat... I
recently learned that there are needle like calcium oxalate crystals in
the plant. Probably mom hadn't cooked it enough or like some other people
say that only a leaf of a particular age can be eaten or maybe we have a
different kind of plant here. |
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