Amorphophallus prainii dilemma

noonamah, Australia

My Amorphophallus prainii has gone dormant, but it seems too early. There's still a few months of growing season left. It was fully grown when I bought it last year. Had to travel in the car for a week before getting home so it was knocked about a bit. That was last September. A few weeks back I noticed some yellowing on some of the leaflets. Then slowly it did a normal end of season die-back. This was around the time when we had a very distinct lull in the wet season.

I've dug it up and the tuber looks okay (weighed in at 16 grams). Because we've still got quite a bit of hot humid weather ahead I'm not sure whether I should put it in a pot with soil to see if it's going to sprout back. September it was fully grown so must have started in the cooler months. I don't know much about prainii, don't even know where it comes from.

Over the last couple of days I've noticed my A. bulbifer is getting a bit of yellowing on the leaflets. Looks like it was affected by the drier spell as well. Some of the bulblets on the leaf are quite big. The paeoniifolius and titanum are still chugging along merrily and not looking like they're after an early retirement.

Thumbnail by tropicbreeze
Nashville, TN(Zone 6b)

I would plant it and see if it will put up another leaf as sometimes they will. Just make sure that the soil you put it in is not very wet. Otherwise you might want to plant it in some new soil that isnt to wet. And dont water til you see growth otherwise it will rot. A. prainii is from southern Thailand, Malay Peninsula,Indonesia. Good Luck :)

noonamah, Australia

Thanks, I'll give that a try. I was thinking of putting it in a pot this time. If it doesn't sprout in the next month or so the pot will dry out more easily. Our dry season is very dry. Do you know if the tuber multiplies or whether you only get new plants from seed?

Nashville, TN(Zone 6b)

they usually split when they get mature. If you are really really dry it is possible that it didn't get enough water. And maybe that is why it went dormant. I dont know how bad it got knocked around but I have grown quite a few that got busted up a little with accidents such as tree limbs but usually they will keep growing if it isn't too bad. careful on water when it has no growth I cant stress that enough.

noonamah, Australia

I had it growing for 6 months, and it was probably a couple of months old before then. That's what made me think it might have felt that it's had long enough. It was on light irrigation between heavy rainfall events, but when the heavy rains stopped was when it went into dormancy. It was growing in a bed of 6 paeoniifolius, 1 bulbifer and 1 symonianus. Just recently the bulbifer is showing signs of winding down, the others are still going strong.

This is the prainii when it started making its bid for early retirement. I think that's just a small paeoniifolius under its leaf.

Thumbnail by tropicbreeze
noonamah, Australia

That's the prainii on the right hand side, yellowing a bit. The 6 tall ones on the left are paeoniifolius. The tall one on the right of them is the bulbifer. Hard to see, just to the front and left of the prainii is the symonianus. Right up the back is a scattering of about a dozen smaller peaoniifolius.

Thumbnail by tropicbreeze

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