Low nutrient habitats

I’m working through the plans for the low nutrient habitat display in the glasshouse.  We already have a good range of epiphytic bromeliads and some epiphytic orchids.  There are also a range of carnivorous plants to be grown here including Heliamphora, Utricularia and Nepenthes.  I’m hoping also to add some ant plants – Myrmecophytes – including ant ferns that have a relationship with ant species that protect the plants from herbivore attack.  To grow these plants means setting up a rainwater reservoir as our tap water has too much calcium and too many other nutrients for the plants to thrive.  The growing media will a mixes of orchid bark, live Sphagnum (which we have been cultivating for many years) and Seramis granules.