Amydrium medium 'Silver'

This plant is a climbing Araceae.

Due to their way of life, climbing aroids are also called “nomadic” vines. They usually start their lives on the forest floor, where they live as rather thin vines with poorly differentiated leaves and try to find a tree to climb. If they find a suitable surface to climb, they attach themselves to it with special adhesive roots (similar to ivy) and grow upwards. Only then do the leaves differentiate into their later adult form, and only then do they grow larger. After a few meters, many species also form so-called aerial roots, which, unlike adhesive roots, do not serve to attach to the substrate, but instead hang freely to the ground, thus supplying the plant with additional nutrients. Often, after a few years and several meters of stem length, the lower part of the stem that connects the plant to the ground dies off, and it is then only in contact with the soil via its aerial roots. Now the plant lives as a so-called hemiepiphyte, or “half-epiphyte.”
In this way, nomadic vines climb large primeval trees over many years, where they finally reach their maximum size and bloom in the treetops.

This way of life should be imitated in cultivation (at least to some extent) to obtain beautiful and healthy plants. Many climbing aroids are easy to care for indoors despite their unusual lifestyle.

This plant grows as a young plant in shady undergrowth and as an adult plant in the much brighter canopies of primeval trees. With too little light and without climbing aid, it remains in its juvenile form and becomes leggy. Bright to very bright indirect light, e.g., next to a west or east window or somewhat protected at a south window, is ideal.

When cared for under grow lights, e.g., in a plant cabinet, terrarium, or grow tent, it requires quite strong lighting. It grows well at 5000 to 10,000 lux or 90 to 180 PPFD (µmol/m²/s).

Supplemental lighting to better endure the dark winter months greatly benefits this plant. Otherwise, it will produce significantly smaller leaves over the winter, which look unsightly overall.

This vine prefers humidity of 60% or more and still grows well at over 90% rH. It is not sensitive to cool temperatures and can even tolerate night temperatures of 15°C, but it only grows well at 23°C or more.

This plant prefers a coarse to very coarse, airy yet consistently moist substrate. It should be potted in a loose, acidic (pH below 7), and very airy mix. For this plant, we recommend our Aroid Mix or, for larger specimens with a pot size of 30 cm or more, pure coconut chips.

The pot for this plant does not need to be particularly large. A pot that is too large will cause the substrate to dry out on top while remaining wet at the bottom. This can lead to overwatering, as one might mistakenly believe the plant needs more water when it is already sufficiently moist. Finding the right pot size requires some experimentation. As a guideline: If you can water approximately every 5 to 10 days, and the substrate is almost completely dry in between (just bügelfeucht, meaning slightly damp like clothes after ironing), the size is well chosen.

As this is a climbing plant, a climbing aid should be provided to allow it to exhibit its natural growth. For this, you can either offer a coir pole as a pure support for aerial roots or (even better) a moss pole filled with Sphagnum moss or a mix of Sphagnum and coconut chips. The moss pole not only serves as a climbing support but also provides extra root space for the plant if the pole is kept consistently moist.

This plant should never dry out completely, but how moist it likes to be depends heavily on the (substrate) temperature. At temperatures above 25°C, it can be kept consistently moist to wet. If it is kept as a houseplant (especially on the windowsill), it should be watered sparingly in winter, as the combination of colder temperatures and moisture can weaken it and lead to rot.

This is a fast-growing species that needs a lot of fertilizer. Fertilization should take place during the main growing season, from approx. May to September. If there is no additional lighting, this plant will barely grow from October to April and does not need to be fertilized. No special fertilizer is required. A normal complete fertilizer (N-P-K + trace elements) for houseplants is sufficient. We recommend using the dosage specified by the manufacturer (this corresponds to about 1000 µS/cm conductivity of fertilizer).

When cared for under grow lights, it can be fertilized year-round.