Glasshouse plants

Philodendron melanochrysum
Black gold philodendron

Philodendron melanochrysum (previously listed as P. andreanum) is a tropical, epiphytic climber. It is native to Colombia and Costa Rica and is grown for its enormous leaves, which can grow up to 1m (3ft) long. Melanochrysum means black gold - used to describe the tiny golden sparkles sometimes seen on the leaves in sunlight.

The bright yellow veining of adult leaves contrasts beautifully with the dark leaf surface; when seen from underneath they seem to glow. Plants can easily reach a height of 6m (20ft); the leaves get larger as the plant grows higher up the support.

Although it will grow in reasonably well-lit places, it prefers shade or dappled shade conditions. It prefers a warm environment, but will tolerate temperatures as low as 15°C (60°F). To keep the foliage healthy and looking its best plants need a humid environment, but again can tolerate the lower humidity of most houses. For best results, mist the foliage regularly, or stand the pot on a sacer of mosit pebbles or, better still, hydroleca. Water frequently to keep the compost evenly moist, but not soggy; never let the plant stand in water. Plants should be fed every couple of weeks during the growing period - March to September.

Repot overcrowded plants during spring, using a general-purpose potting compost. Plants can be propagated in spring or summer from stem cuttings, or by air layering.

Some philodendrons contain a chemical that can cause a burning sensation and can be toxic if the foliage is eaten.

Geoff Hodge

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