Carnivorous Plants/Drosera

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Drosera
Drosera  

Drosera regia
Drosera regia  
I have some types of tropical drosera in my my greenhouse. They only get distilled water and it stays around 35-50 percent humidity in the greenhouse. They also are located on a bottom shelf under my nepenthes and heliamphora. I put them there so they would get mild temperatures since it is cooler on the bottom and receives a little less light. It reaches about 90 degree, but I have a mister that goes on and brings the temp to 75-85 degrees. They are also near a fan to keep them cool especially when it reaches 100 degrees in my green house.They get bright- indirect sunlight throughout the day for about 12-14 hours. I noticed though, the dew on them vanished and were producing droopy leaves and fewer leaves than usual. If you could give me an answer I would really appreciate it.'

Answer
Hi Jarred,

What you're experiencing is a common lesson all of us learn when growing cp.  Light exposure trumps temperatures every time.  With North Queensland Sundews being the only exceptions, all sundews are full sun plants.  Mucilage (dew) is produced directly from photosynthesis.  If your plants are only getting indirect sun, it's not bright enough.

Here's what you can do.  Move them back to the top shelves again.  Do lots of top watering during hot periods.  Try not to have the fans blowing directly on the sundews.  That will definitely dry them out.  Same with the misters.  Lots of water falling on sundews will have them always trying to replace their mucilage.  A little is fine, just not constant misting.

To get your temperatures down some on your greenhouse, see if you can get air moving in from both ends.  Also, use some shade cloth.  A 30% cloth is usually good here in the Northwest.  This is different than putting plants on a lower shelf since it diffuses the light rather than blocking it the way a shelf does.  Here's an example:  http://www.greenhousemegastore.com/product/30-percent-black-shade-cloth/shade-cl (We've ordered from this company before.  They've been great, but you can get shade cloth lots of places.)

Good Growing!

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

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