Highland Nepenthes are categorised as living at altitudes of 1500 metres and up.
The daytime temperatures for highland species should range between 25 and 28°C all year round and drop down to 10-14°C during the night
With night temps optimally 10°C over the winter months. This is not always necessary for their survival but mostly optimal.
There are always mavericks in the crew though, which can quite happily live outside this range.
Because highlanders require more light than lowland plants, extra lighting may be necessary when keeping them indoors or in terrariums (use broad spectrum lights… such as T5 growlights). They like bright greenhouses and can even tolerate direct sunlight for a few hours a day if you live in a high humidity area where they can be grown outside.
Red spots or brown areas on leaves are a sign of sunburn so place them where there is more shade if this occurs. Yellow leaves are also a sign of too much overall light for your plant.
Thin and spindly growth means your plants require more light.
Ideal humidity for these guys is around 60% during the day rising up to 99% during the night. Its not advised to be much below 60% too regularly or this could affect pitcher growth.
All Nepenthes are susceptible to damaging effects of minerals and salts in their water (do not add fertilizer to water).
Distilled, reverse osmotic or clean rain water are the preferred forms however most nepenthes can cope with town water up to 250ppm…. it is however recommended that you flush their substrate out every few weeks to remove any mineral/salt build up if using this form of water.
Nepenthes should never be waterlogged (by using trays or non draining locations). They should also never be allowed to dry out.
They thrive in moist but airy conditions around their root systems which can be achieved with regular watering and the following substrates.
They will also enjoy regular misting with purified water.
There is no set mix that covers them all so please experiment with a variety to find the one that keeps moist but not wet and allows air around the roots (porous) without drying out between watering. We find that keeping it simple with two or three ingredients (such as perlite and coconut husk for drainage/aeration mixed with some sphagnum moss for water retention works well in general).
It may help the research individual plant needs as they originate from a vast variety of locations and soil types. Ultra highland plant generally do well with a high sphagnum/perlite mix and can be grown in pure live sphagnum while many lowlanders will do well with a more Peat moss, husk and perlite mix. Wiki gives heaps of hints when describing habitat.
Good substrate materials we mainly use are: perlite, sphagnum moss and pine bark.
Most of these materials are available Australia wide. For small collections most ingredients can be picked up at any Bunnings though if the collection grows you will save money by buying larger quantities from a supplier like Garden City Plastics. They sell 3 kg bales of dried sphagnum moss, pots and 100L bags of perlite.
Your particular mix will depend on the type and size of pots/containers, the plant size and their location, such as windowsills, greenhouses or terrariums as well as your local weather and humidity conditions.
Do not use clay pots as the minerals/salts tend to get retained in them which will in turn make your plants suffer.
Keep away from materials with “added nutrients” at all times….look for “power” or “feed and mulch” on the label and put them back on the shelf!
Re-pot your nepenthes every couple of years. plants outgrow their containers or if the materials break down (spag moss is notorious for this if kept to wet) or the mix dries out too fast.