Question

Black spots   QUESTION: Sorry I forgot to attach picture on the first try. I moved my plants from my greenhouse into my unheated garage during the past freeze because I and it looked fine,  this is how my jamban looked today with black spots on the leaves... Do you know what I might be dealing  with?
Thank you.

ANSWER: Hi Nanthawat,

If the black spots appeared after just one night, then this is cold damage.  If it's not too extensive, it should recover if kept in stable temperatures.

Is your greenhouse unheated?  What made you move it to the garage?


Good Growing!

Jeff Dallas
Sarracenia Northwest
http://www.growcarnivorousplants.com

---------- FOLLOW-UP ----------

QUESTION: I didn't look at it for the few days it was in there but I didn't want to bring it into the house where it would be significantly warmer. I brought them in because I can't afford to keep it heated for the entire week. (during the extra cold week that we just had.) they're back in the greenhouse now where I just heat it up at night.

Answer
Hi Nanthawat,

I would still say it got too cold in the garage.  For highland species in Southeast Asia it may drop briefly in the 40's at night, but it's still fairly warm during the day.  During your cold spell it was probably just too cold over all.  I've had those type of spots appear on N. truncata lowland variety when they have been transported in the back of a truck with a canopy in temperatures in the 30's and 40's.  If your temperatures in the garage were in the 30's at night, but only say 50's during the day, that's too cold even for a highland species.  For just a week or so the house would not have been too warm.

Our Jambans are in our Nepenthes greenhouse, and temperatures are in the low 60's to upper 50's at night, and 70's during the day.  Summer it's much warmer during the day, but nights are still cool.  They've done just fine with those temperatures.

Good Growing!

Jeff Dallas
Sarracenia Northwest
http://www.growcarnivorousplants.com