My "monster" Konjack SHRUNK!

Poughkeepsie, NY(Zone 6a)

Well I dug up my 11 1/2"across, 13 pound Konjac I planted this past spring yesterday. She SHRUNK! She's now 8" across and 4 pounds. She produced no babies either. Since she did bloom this past spring I guess I attribute the shrinkage to that.

Anyone experience this? I suppose it is normal.

noonamah, Australia

I don't know if it's normal, but it is logical. Flowering and fruiting take a lot of energy and nutrient which would have taken out most of the old tuber. Wouldn't have been a lot left for a leaf which in turn wouldn't have been able to produce a very large tuber.

Poughkeepsie, NY(Zone 6a)

She produced a normal leaf this year but I guess the flowering did take a lot out of her.
Lesson learned! Adds more info to my brain!

Brains are pink, wonder why they call it "gray matter"?

Siloam Springs, AR

The process is normal. The starch stored in the tuber provides a source of energy for the production of the inflorescence. This can be reversed to some degree by the use of fertilizer during the growth period. Most of my friends that are Amorphophallus growers use either 10-15-10 or 20-30-20 on a regular basis.

Steve

Siloam Springs, AR

I just looked over an article by Dr. Wilbert Hetterscheid who is the world authority on the genus that may be helpful:

http://www.aroid.org/genera/amorphophallus/amcult.php

Steve

Poughkeepsie, NY(Zone 6a)

Thanks much for the info Steve!

I use a 1/4 strength orchid feed on mine at every watering.

Siloam Springs, AR

That should work. I prefer the pellet type which I use every couple of months. I am most concerned about the growth of my A. titanum and "over feed" it just a bit.

Steve

Provo, UT(Zone 5a)

my konjac corms are 1/2 original size.. corms are firm so im hoping when the flower
stalk slufs off eventually.. and i get potted up.. i can get the corm to put on some size for
next yr..
?? does konjac flower every year?? if corms gets good sized again...
i understand the titanum doesnt..or is not predictable..that is after the corm is of size
where it will/can flower...

noonamah, Australia

You have to remember that the tuber is "swallowed up" entirely each year. It's a new one that developed during the growing season. Ideally you should pot up the tuber when it first starts growing, whether it's a flower or a leaf. When it's in soil it will put out roots and start to draw in nutrients. If you leave it out the only nutrients it can get are in the tuber, so it will be depleted sooner. This means a flower will do well but the following leaf will be a bit starved, not grow as big and consequently slow down the new tuber growth. It will make a difference if you get the roots happening as early as possible. I don't know whether konjac flowers each year but the paeoniifolius doesn't, the bulbifer does. With the galbra I haven't been able to tell yet.

Poughkeepsie, NY(Zone 6a)

Ahhh, makes sense. Thanks! I have a flower stalk 34" tall right now, growing about 2 inches per day!

noonamah, Australia

That's one of the amazing things about Amorphs, you can sit there and almost see them grow.

Provo, UT(Zone 5a)

much thanks tropic !! i'll get mine potted up right away.. i would love to get corms i
have to get to a BIGGIE corm..in couple yrs.. :)

Poughkeepsie, NY(Zone 6a)

One Konjac about to open!

Thumbnail by tommyr2006
Poughkeepsie, NY(Zone 6a)

I potted her this afternoon:

Thumbnail by tommyr2006
noonamah, Australia

That inflorescence looks way out of proportion to the tuber. My bulbifer produced an inflorescence quicker than I'd expected so it got potted not long before the spathe opened. But it was smaller in relation to the tuber than what your konjac is.

Provo, UT(Zone 5a)

great pics tommy !!.. i hope my biggest konjac corms put on some size for next yr..
whether they bloom or not..
sure grateful for good practical postings here.. i was going to leave my
corms out of soil till flower spike withered..and new vegy spike started to grow..
hope ya get a HUGE flower tommy !!!
ive seen a few titanum corms up on auction on ebay.. havent bid on one yet.. i dont
know that these corms are really as big as i want.. im thinking a 6-8# corm is several yrs
away from flowering..??? do u all think same??? that is with a titanum...
in summer my yard is full of tropicals anymore.. why do i live in utah??? LOL i can
see potted up amorphs being added to my collection now.. :)
good stuff...

Provo, UT(Zone 5a)

heres pic of my 3 biggest konjac .. finally got pic posted here..
they finished flowering from 2 weeks ago to just last week..
??? how often does everyone water them.. right now.. ??
pic is just after i potted them up.. so i watered them good..
how about until vegetative growth starts..and then when they do
have vegy growth going??
much thanks...

Thumbnail by tropicalnut777
Poughkeepsie, NY(Zone 6a)

After mine bloom I don't water again until I see the leaf stalk coming up through the top of the soil. It could take 3-4 weeks. Then I start watering with a 1/4 - 1/2 strength fertilizer mix. Orchid food is what I normally use but Miracle grow is o.k. too or any 10-10-10 food.

Poughkeepsie, NY(Zone 6a)

She has begun her 2-3 day stinkfest!

Thumbnail by tommyr2006
Provo, UT(Zone 5a)

lol tommy.. :) great flower ya got there !!
of the 3 corms i have potted up.. the flower stalks are staying firm?? is that normal??
they began to shrivel up while bareroot..but now potted up..they are firm..
im guessing they are absorbing moisture from the little in the soil.. im thinking??
that this is good..that more moisture is going into the corm as well.. i dont want to disturb
the pot and check the corm out..i dont take this as a negative thing..???
anyone else think so too??
ive been taking them outside on sunny warm days lately..
yea!! weve actually had some 60F days lately..
spring at last !!!!!

Poughkeepsie, NY(Zone 6a)

When the flower stalk flops over just cut it off about an inch or two from the soil surface. Shortly after you'll be able to gently pull it off. The Leaf will be under it and should start up in about a month.

Provo, UT(Zone 5a)

thanks tommy !! i was suprised that the flower stalk firmed up again..it had started to wither..
im looking foward to see the vegetative groth of my konjac's.
and bigger corms next yr.. !!!!
?? how tall is your flower now tommy?? how big of a pot is that too??
i understand its important to give lots of room for the roots..so ya end up with even
larger corm for next season...
couple more days of stinky huh..hehehehehhee :)

Poughkeepsie, NY(Zone 6a)

The pot is 12" across. I probably should have went a bit bigger actually. The flower itself from top tip to the base of the flower is 26". I have 2 4-5 inch diameter corms to plant yet.

Provo, UT(Zone 5a)

tommy..??hows your konjac doing?? did you try to pollinate it?
ive asked friends that hit yard sales to buy up any BIG black plastic pots for me..:)
im sure going to need them next yr.. i hate spending $30 for a big sturdy pot at homedepot when
ya can get a used one for $5 :)
my konjac that have berries are doing well still..YEA.. berries are plumping up a bit more..
im guessing in couple months they will turn..and ripen.. then its.. planting them.. :)
i think my neighbors are going to hate me..nest yr.. LOL

noonamah, Australia

Neighbours? More likely the whole district, the way you're going, LOL. The last 2 of my konjacs are finally turning it in. They started off the size of peas at the beginning of the season. Looking forward to seeing how much they've grown. They've had a good 6 months of growth.

Poughkeepsie, NY(Zone 6a)

I never try to pollinate or wait for seeds. The main corms produces enough baby corms in the fall to keep me in supply.

Provo, UT(Zone 5a)

i think its the challenge for me..LOL if i havent tried it. hey..
why not try it..:)
?? tommyr..how big do your corms have to be to get baby corms??

Poughkeepsie, NY(Zone 6a)

Not that big at all. Softball sized or so.

Provo, UT(Zone 5a)

very nice tommyr... i guess i'll be getting baby corms too then..
yea!!! lol
couple of my larger konjac that i didnt polinate are sending up vegy spike now
i put them in ok pots..about 4" space on each side .. i guess the more room the better>>>???
to accomodate the roots and give plenty of room for them to grow out..??
with last ones ive bought..im going to try them right in ground..but im going to do as recommended
here.. make a raised bed.. filled with same good loamy,well draining soil.. bed should warm up nicely..
and stay that way thru oct.. so ..hopefully a good long growing season for them... hopefully.. never
know what mother nature throws our way..

Poughkeepsie, NY(Zone 6a)

Four inches a side sounds good to me, as long as it has real good drainage.

Provo, UT(Zone 5a)

tommyr.. hows your konjac's doing?? are you going to try to
get your biggest one back up to HUGE size for blooming next spring??
one of my average corms that bloomed..but i didnt pollinate.. and now in leaf is doing pretty
good..
one thing ive noticed is the stalk has grown in girth the last couple weeks.. im guessing thats good..???
heres a pic of it

Thumbnail by tropicalnut777
Poughkeepsie, NY(Zone 6a)

My larger ones are throwing up the leaf spikes. One is about 8 inches tall so far, the others are just breaking the soil surface. Yours looks great!

Pics once my leafs open up.

Provo, UT(Zone 5a)

how are your leaf spikes comming along tommy? hope good.. :)
we are having such hot weather..for mid june.. whew..
ive moved leafed out amorphs to place where they get semi shade after 2pm.. leaves look good
so i guess the full hot sun isnt doing any harm..ive sure had to water more though.. the pots get light
after just 2 days.. im anxious to see how big my largest corms get after this growing season..
i hope ive done what they need to replentish energy..
stalk on largest konjac has gotten to a real nice size in girth..at widest its just shy of 5 "
i think next yr i will put many of the bigger ones in even bigger pots..
tommy?? what fertilizer do you use on your amorphs?
im using a 3/4 full strength 20:6:6 right now.. twice a week..i was advised by lari ann to
go to a even 14:14:14 mid summer..followed by a higher P fertilizer last 6 weeks before they come
in..
love these amorphs !!! addictive arent they.. :)

Poughkeepsie, NY(Zone 6a)

My largest one is about to open it's leaf. The 2 slightly smaller ones are getting there but a little behind. My baby corms (dime to quarter size) are not showing yet. Photos to come shortly once they open!

Mine get very early Sun only and shade the rest of the day.

I'm feeding 20-20-20 at full strength once a week or every 2 weeks.

Thanks!

Provo, UT(Zone 5a)

is this about normal time for your konjac to open up? its such a weird season everywhere..
we hit 100F again today.. whew..
they..weather people.. say were to "cool off" into next week.. yea..cool off.. mid 90Fs.. LOL
?? so tommy..do you think im giving my konjacs to much sun?? they look good..no burning of
leaves..or wilting..?? this is my 1st vegetative season..so.. i am a rookie..LOL :)

noonamah, Australia

Bright light but not too much direct sun is best for them. Mine grew in shade all day but it was still quite bright. There was a mixed reaction from the different plants to the growing season. Although there wasn't much difference in the size of the leaves there was a huge difference in the size of the tubers. They all started off about the same size.

Provo, UT(Zone 5a)

hi tropic!! :)
so the more bright light (not hot direct light) you found the corms were much
larger? probably from leaves taking in all that light..and putting energy into the corms??
i think i am giving mine a bit on the strong side of light.. probably later in the summer when
the sun isnt directly overhead..i can move them futher into more "direct light"..
i have several places i can move pots where they'll get good light..just not as direct..
ones i have in the soil..i think i should rig up a shade cloth.. they get direct light..all
day.. they look good..but..thats all day..direct light..
i guess if is hear a cracking noise..and the sides of pots with amorphs in them.. explode..
i'll know the corms are gettin pretty big...?? LOL

noonamah, Australia

With the wild growing paeoniifolius you find them in all sorts of situations. But all the ones growing in predominantely grasslands, and thus more direct sun, are usually much shorter than the ones growing under tree canopy. I'd guess konjac would probably respond the same.

San Francisco, CA

I know it sounds counter-intuitive, but several papers in Japan and China showed that A. konjac and paeoniifolius grew bigger tubers under 75% shade cloth; even better than ones grown under 50% shade. All data showed weights that were significantly higher when heavily shaded versus if grown in the direct sun. Just made me scratch my head, so I thought I would share.

This message was edited Jun 26, 2012 2:03 AM

Provo, UT(Zone 5a)

vestia..interesting.. can you post those sources..id love to read their research..
it does sound counter to leaves taking in more energy..from more sun.. but maybe its
the corm is put under stress from the direct sun?? but i would love to learn more..
i want to grow some HUGE corms..if i can.. :)
thanks for info..hope you will post sources.. much thanks !!!! :)

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