Philodendron Imperial Red (Imperial Red Philodendron) care

Light

Philodendron Imperial Red is what florists mean by "bright spot, no direct sun" — close enough to a south or east window to feel the brightness, with a sheer curtain or a few feet of distance keeping the sun off the leaves. Bright, indirect light brings out the richest red and burgundy tones in new leaves. It tolerates medium light but growth slows and colour dulls. Avoid direct midday sun, which scorches the foliage; an east window or a few feet back from a south or west window is ideal. A phone lux-meter at the leaf surface should read 1,500-3,000 lux at noon.

Watering

Water philodendron imperial red every 7-10 days; when the top 2-3 cm (1 inch) of soil is dry. The actual day count varies with pot size, light, and season — the finger test (or lifting the pot to feel its weight) is more reliable than a fixed calendar. Empty any drainage saucer afterwards so the pot isn't sitting in water. Keep soil consistently moist but never waterlogged. Water thoroughly until it drains from the base, then let the top inch dry before watering again. It declines quickly from overwatering, so ease off in winter when growth slows. Use room-temperature water and empty the saucer to prevent root rot.

Soil and pot

Philodendron Imperial Red grows best in loose, well-draining aroid mix. Use a chunky, airy mix that holds some moisture but drains fast, such as quality potting soil amended with orchid bark, perlite, and a little coco coir. Aim for slightly acidic to neutral pH (around 5.5-7.0). Always pot in a container with drainage holes. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Philodendron Imperial Red sits happiest at around 40-60% humidity and 18-29C (65-85F). Adapts well to average household humidity but prefers higher levels, which support larger, glossier leaves. In dry rooms or winter heating, group plants, use a pebble tray, or run a humidifier. Browning leaf edges often signal that the air is too dry. If you keep the room above 18 year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed philodendron imperial red sparingly. Feed every 4-6 weeks during spring and summer with a balanced, diluted (half-strength) liquid houseplant fertiliser. A urea-free formula is gentler on the roots. Stop or sharply reduce feeding in autumn and winter when growth naturally slows, and flush the soil periodically to prevent salt buildup. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on philodendron imperial red in the Growli community. Each is annotated with the most common cause so you know where to start.

• Yellowing leaves — Usually overwatering or poor drainage. Let the top inch of soil dry between waterings and ensure the pot drains freely. A single older lower leaf yellowing occasionally is normal aging.
• Brown, crispy leaf edges — Typically low humidity, underwatering, or salt buildup from fertiliser. Raise humidity, keep watering consistent, and flush the soil occasionally with plain water.
• Dull or fading red colour — New leaves stay green or lose their burgundy tone in low light. Move to brighter indirect light (without direct sun) to restore the vivid red emergence.
• Drooping or wilting — Can signal both underwatering and overwatering. Check the soil: if dry, water thoroughly; if soggy, let it dry out and inspect roots for rot.
• Root rot — Caused by chronic overwatering or a pot without drainage. Leaves go soft and yellow and roots turn mushy and brown. Repot into fresh airy mix, trimming away rotted roots.
• Pests (spider mites, mealybugs, thrips) — Watch for webbing, white cottony clusters, or stippled leaves. Wipe foliage, isolate the plant, and treat with insecticidal soap or neem oil, repeating weekly until clear.

Propagation

Harder to propagate than vining philodendrons because it is self-heading and lacks trailing nodes. The most reliable method is division: when repotting, separate basal offsets (pups) that have their own roots and a few leaves, and pot them individually. Commercial stock is largely produced by tissue culture. Keep new divisions warm, humid, and in bright indirect light while they establish. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Philodendron Imperial Red is toxic to pets. Toxic to cats and dogs. The ASPCA lists Philodendron species (family Araceae) as toxic to both, with insoluble calcium oxalate crystals as the toxic principle. The 'Imperial Red' cultivar is not individually named by the ASPCA, but the genus is firmly listed as toxic, so treat it as unsafe and contact a vet if a pet chews it. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Philodendron Imperial Red deep-dive guides

Every aspect of philodendron imperial red care, each with its own calibrated guide:

• Philodendron Imperial Red watering schedule
• Philodendron Imperial Red light requirements
• Best soil mix for philodendron imperial red
• Philodendron Imperial Red fertilizing guide
• When to repot philodendron imperial red
• How to propagate philodendron imperial red
• Philodendron Imperial Red growth rate & size
• Philodendron Imperial Red cold hardiness
• Philodendron Imperial Red temperature & humidity
• Is philodendron imperial red toxic to cats & dogs?

Related guides

Philodendron Imperial Red is also known as Imperial Red Philodendron, Red-leaf Philodendron 'Imperial Red', and Blushing Philodendron 'Imperial Red'.

• Types of philodendron — varieties identified, with care and pet-safety
• Snake plant care — light, water and common problems
• Dracaena care — light, water and common problems
• Peperomia care — light, water and common problems
• All 389 plant care guides in the Growli library