Shock symptoms

[Michael]

What is the commonest symptoms of an highland Nepenthes, when stressed by high night temperatures? Do the growth stops? The leaves get more tiny? Do they yellow sudenly and wither?

[rainforest]

Michael,
Are you referring to plants already established and growing or newly potted recently received plants? And give us some examples of "highland" plants.
Some species such as N. maxima, ventricosa, veitchii are called "highland" yet they can grow quite well in warmer conditions. If you're referring to N. rajah, lowii, etc. and from tc'd plants, then we're talking about true highland nepenthes.

M

[cindy]

Michael, I live in year round lowland conditions with little or no night temperature drops. My early experiences (due to a certain trait known as stubborness) with highland plants such as N. rajah, N. lowii, N. hamata, N. epipphiata and N. sibuyanensis is that they all react by producing smaller and smaller leaves which become narrower. The plant eventually stops growing altogether and can remain as such for many months before it starts rotting from the roots upwards into the stem and dies.

[Michael]

Michael, i'm refering to species like N.rajah, N. villosa, N. aristolochioides, N. lowii, etc. Presume that you have plants well stabilished and growing fine. But in theory, if you give them lowland conditions from now on, what kind of symptoms shall we expect to see? I am asking this, because i never had stressed highland plants, so it would help me identify the problem faster, because i really do not know how they look like when stressed by hight night temperatures.

Cindy, in what range of temperatures are your plants growing?

[rainforest]

Michael,
The plants mentioned do require night time cooling for best development. If you plan to grow these highland sorts, you will need an air conditioner for night time chilling. There are ways to modify your greenhouse to incorporate various methods of cooling. Some have used evaporative cooling with great results and others have incorporated other fans and chilled water tanks for effective internal cooling. With the rising cost of fuel, I would suggest moving to a highland area for natural cooling.
Hybrids of highland crossed to lowland species grow adaptably well in warm conditions.

M

[cindy]

Michael,
My day temperatures are in the high 80s and night in the low 80s on average. Even from November till February, the temperatures will be at the lowest a mere 75F.

[Michael]

Thanks for your replies!
Cindy, where do you live? I presume it is a tropical country. I give my highlanders 60º at nigh on summer and 50ºC on winter aproximately. I know it might not be enough, but let's see how they do

[cindy]

Hi Michael, I live in Singapore. One degree North of the equator.