Grammatophyllum

This spectacular species is native to Borneo, the Philippines, Sulawesii and the Molucccas. These are incredible plants that get tall 2 to 3 foot spikes with 75 to 100+ flowers on each spike! The flowers are fragrant, long lasting and around 3 inches in size. The colors are green with brown mahogany spots. The flowers are long lasting and we have had customers tell us that the plants have had flowers on them for 5 months.

Grow intermediate to warm and water just as the potting mix dies out. When in spike or in flower water as the mix approaches dryness. These are specimen size plants that take a lot of time to grow to flowering size.

Light

Grammatophyllum enjoys the morning and afternoon sun most, yet should be protected from the hot mid-day sun. A light green leaf with just a hint of yellow indicates the maximum amount of sun the plant can take, and a dark green leaf indicates not enough sun.

Temperature

Will tolerate considerable summer heat as long as they get cool, mild night temperatures (between 50-65 degrees F.). Cold weather, even down to 28 degrees F. for a few hours each night, will not damage an acclimatized plant, but once the plant spikes or flowers, it should be protected from temperatures below 35 degrees F. Regardless, plants should always be kept free of frost.

Water

Is a delicate balancing act. They should not be allowed to go dry, yet they don’t care for a soggy environment either. Watering once every seven to ten days is about right. As with everything else, special consideration must be given for the drying effects of varying ambient air temperature and humidity.

Humidity

Like it warm and very humid. The humidity level should be at least 50% or higher. Increase the amount of humidity in the summer months (Mist the leaves daily). Make sure the plants have good air circulation.

Fertilizer

High nitrogen fertilizers should be used from February until July, while low nitrogen fertilizers should be used from August until January. Feed 1/2 teaspoon to a gallon of water once a week.

Potting

Repot every two to three years from February to June with a well-draining medium. Fine bark is suitable in mild summer climates, while a finer medium Orchid Mix works well in warmer summer areas.