Tropical pitcher plant care guide

The tropical pitcher plant is a carnivorous vine from Southeast Asia. The tip of each leaf grows a thin tendril that swells into a hanging cup. Insects fall in and drown in the fluid. Indoors, it grows best in a hanging pot near a bright window. It needs pure water and moist air to keep making pitchers.

These tips are for the hybrid nepenthes sold in stores and garden centers. Wild highland species need cool nights and are harder to grow in a home.

Light

Give it bright indirect light. An east window is ideal. A few hours of soft morning sun helps the pitchers color up.

In low light, it grows long, thin vines with few pitchers. A grow light set 30 cm (12 in) above the plant works well in winter.

Red spots and blush on the leaves mean it gets good light. Bleached or yellow leaves mean too much hot sun.

Water

Use distilled water, rainwater, or reverse osmosis water. Minerals in tap water build up in the moss and burn the roots.

Keep the moss moist, like a wrung-out sponge. Water from the top until it drains. Do not let the pot sit in a tray of water for days. This plant is not a bog plant like the Venus flytrap.

Leave the fluid in the pitchers alone. Do not empty them or fill them.

Soil and potting

Never use regular potting soil. Pot it in long-fiber sphagnum moss, or a mix of sphagnum, perlite, and orchid bark.

Use a plastic pot or a slotted orchid pot with drainage holes. Repot every year or two in spring, when the moss starts to break down. See how to repot a houseplant step by step.

Humidity and temperature

Humidity is the key to pitchers. At 50% or higher, most hybrids make pitchers on every new leaf. In dry air, the leaves grow, but the tendrils stay empty and dry.

A humidifier helps. So does a spot in a bright bathroom or kitchen. Many store hybrids adjust to about 40% over a few months.

Keep it between 18 and 29°C (65 and 85°F), and above 13°C (55°F).

Feeding

Do not add fertilizer to the moss. It burns the roots.

Indoors, it may catch a few gnats and flies on its own. You can also drop one small insect, or a freeze-dried bloodworm, into one or two pitchers once a month. Do not overfill. Too much food rots the pitcher.

Pruning

Each pitcher lasts a few months, then browns and dries. That is normal. Cut off dead pitchers at the tendril. Keep the leaf if it is still green.

Long vines get bare at the base. Cut a vine back to a few leaves in spring. New shoots grow from the base and make the plant fuller.

Propagation

Cut a piece of vine with two or three leaves. Trim each leaf in half to cut water loss. Push the cut end into moist sphagnum moss. Cover the pot with a clear bag to hold in moisture. Keep it warm and in bright indirect light. Roots take four to eight weeks.

Problems

What you see	Most likely cause
No new pitchers	Dry air, or not enough light
Brown, burned leaf tips	Minerals from tap water, or fertilizer
Old pitchers turn brown	Normal aging
Yellow or bleached leaves	Too much direct sun
Long, bare vines	Normal with age. Cut back in spring.
Black, mushy stem base	Soggy moss with no air

Pests

Aphids, mealybugs, and scale can show up on new growth. Dab them with rubbing alcohol on a cotton swab. Many sprays harm carnivorous plants, so test any spray on one leaf first.

Pet safety

Tropical pitcher plants are not on the ASPCA list of toxic plants. The ASPCA lists the California pitcher plant, a different carnivore, as non-toxic. The fluid in the pitchers may upset a stomach. Hang it out of reach of curious pets.

Varieties

• Nepenthes × ventrata is the easiest to grow. It has green pitchers with a red lid and handles home air well.
• Nepenthes ‘Miranda’ makes large red and green pitchers and grows fast.
• Nepenthes alata has slim pitchers in green to red.
• Nepenthes ‘Lady Luck’ has bright red pitchers with speckles.