How to Grow Emersed Aquarium Plants: Propagation Above Water
Most aquarium plants are actually semi-aquatic species that grow faster and more robustly when their leaves reach open air. Learning to grow emersed aquarium plants opens up a world of easy propagation, healthier stock, and even stunning paludarium displays. At Gensou Aquascaping Singapore, we maintain emersed setups at our 5 Everton Park studio for growing carpeting plants, stem plants, and rare species that would be costly to buy submersed. Singapore’s tropical humidity makes our climate particularly well suited to this technique.
What Does Emersed Mean?
Emersed growth refers to aquatic plants growing with their roots submerged but their foliage above the waterline. In nature, many popular aquarium plants — Cryptocoryne, Bucephalandra, Anubias, Hygrophila, and Echinodorus — spend part of their life cycle growing emersed along riverbanks and flood plains. Emersed leaves look different from submersed ones: thicker, waxier, and more rigid. When transitioned underwater, the plant sheds its emersed leaves and grows new submersed foliage adapted to aquatic conditions.
Why Grow Plants Emersed?
Emersed plants grow significantly faster because they access atmospheric CO2, which is roughly 400 ppm in air versus 2-30 ppm in most aquarium water. Growth rates can double or triple compared to submersed cultivation. Algae is a non-issue since leaves are above water. Propagation becomes far more efficient — you can produce large quantities of carpeting plants like Hemianthus callitrichoides (HC Cuba) or Glossostigma elatinoides in a fraction of the time it would take underwater.
Setting Up an Emersed Tray
You need a shallow container (15-20 cm deep), a nutrient-rich substrate, and a transparent cover to maintain humidity. Plastic storage tubs from Daiso or similar shops work perfectly at $3-8 SGD each. Fill the base with a 3-5 cm layer of aquasoil or a mix of potting soil capped with fine gravel. Add water until it reaches just below the substrate surface — the soil should be waterlogged but not submerged. Cover the container with cling film or a clear lid, leaving a small gap for air exchange.
Humidity and Temperature
Emersed plants need humidity above 80 percent to prevent leaf desiccation. Singapore’s ambient humidity of 70-90 percent gives us a natural advantage — in many cases, a loosely covered tray on a windowsill is all you need. Temperature between 25 and 30 degrees C promotes healthy growth, and our year-round warmth eliminates the need for heating mats that temperate-climate growers rely on. Place the setup near a window with indirect light or under a basic LED grow light for 8-10 hours daily.
Best Species for Emersed Growing
Nearly all popular aquarium plants grow emersed, but some are particularly easy and productive. Staurogyne repens, Hydrocotyle tripartita, Monte Carlo (Micranthemum tweediei), and various Rotala species all adapt quickly and propagate vigorously. Slower-growing epiphytes like Bucephalandra and Anubias also thrive emersed, though their growth advantage over submersed culture is less dramatic. Start with forgiving species like Cryptocoryne wendtii or Java fern if this is your first attempt.
Transitioning Plants to Submersed Growth
When moving emersed-grown plants into your aquarium, expect a transition period of one to three weeks. Emersed leaves will gradually melt and be replaced by thinner, more delicate submersed foliage. This is normal — not a sign of dying plants. Maintain good CO2 levels and adequate lighting in the receiving tank to support the transition. Avoid planting emersed stock into a newly set up tank with unstable parameters; a cycled, stable environment gives transplants the best chance of adapting smoothly.
Dry Start Method for New Tanks
The dry start method (DSM) applies emersed principles directly to a new aquascape. Plant carpeting species into moist aquasoil inside your tank, cover tightly with cling film, and let them grow emersed for four to eight weeks before flooding. This technique produces dense, rooted carpets without the CO2 demands and algae risks of submersed planting from day one. Mist the substrate every two to three days and ventilate briefly to prevent mould. The DSM is especially popular among Singapore aquascapers working with HC Cuba and Monte Carlo carpets.
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