Problems

Philodendron Imperial Red Problems: Causes & Quick Fixes

Quick answer

Philodendron Imperial Red is prone to 10 common issues - each link below is a plant-specific fix guide.

Philodendron Imperial Red problems

Use the guides below to diagnose and fix common issues on Philodendron Imperial Red. Each problem page explains why it happens on this species and what to do first.

Or use our problem diagnosis tool to narrow down symptoms.

Common problems on Philodendron Imperial Red

Ants on Plant

Low

Likely cause: Philodendron is a large genus of flowering plants in the family Araceae. As of September 2025, the Plants of the World Online accepted 625 species; [2] other sources accept different numbers. [3][4] …

Quick fix: Confirm diagnosis on your Philodendron Imperial Red, then address the most likely care or pest factor described in current extension guidance.

Full fix guide →

Brown Tips

Medium

Likely cause: Low humidity

Quick fix: Increase humidity

Full fix guide →

Leaf Drop

Medium

Likely cause: Feb 21, 2024 · Philodendron Types with Pictures and Care Guide The green heartleaf Philodendron is a vining type of plant with dark-green leaves in a heart’s shape. This type of Philodendron can be …

Quick fix: Confirm diagnosis on your Philodendron Imperial Red, then address the most likely care or pest factor described in current extension guidance.

Full fix guide →

Leaf Spot Disease

Medium

Likely cause: Feb 21, 2024 · Philodendron Types with Pictures and Care Guide The green heartleaf Philodendron is a vining type of plant with dark …

Quick fix: Confirm diagnosis on your Philodendron Imperial Red, then address the most likely care or pest factor described in current extension guidance.

Full fix guide →

Leaf Miners

Medium

Quick fix: Confirm diagnosis on your Philodendron Imperial Red, then address the most likely care or pest factor described in current extension guidance.

Full fix guide →

Plant Leaning

Medium

Quick fix: Confirm diagnosis on your Philodendron Imperial Red, then address the most likely care or pest factor described in current extension guidance.

Full fix guide →

Slow Growth

Low

Likely cause: Low light

Quick fix: Move to brighter indirect position

Full fix guide →

Root Rot

Medium

Likely cause: Wet soil

Quick fix: Repot in draining mix

Full fix guide →

Thin Stems

Medium

Likely cause: Feb 6, 2025 · If you are thinking of adding a philodendron to your indoor or outdoor garden, choosing the right variety can be a challenge because there are so many different options. Some are more …

Quick fix: Follow extension or botanical guidance for Philodendron Imperial Red thin stems; adjust care before applying broad treatments.

Full fix guide →

Yellow Leaves

Medium

Likely cause: Overwatering

Quick fix: Allow top 3–5 cm to dry

Full fix guide →

Frequently asked questions

How often should I water Philodendron Imperial Red?

Every 7–10 days in summer - allow top 3–5 cm to dry. Every 10–14 days in winter.

What light does Philodendron Imperial Red need?

Philodendron Imperial Red grows best in medium to bright indirect light, low indirect light (colour dulls).

Is Philodendron Imperial Red toxic to pets?

Philodendron Imperial Red is toxic to cats, dogs, rabbits, birds, horses, turtles, and tortoises. Keep out of reach of curious pets and choose pet-safe alternatives for accessible spots.

How do I propagate Philodendron Imperial Red?

Propagate Philodendron Imperial Red from healthy stem or root divisions during active growth.

What soil is best for Philodendron Imperial Red?

Use standard potting mix + 20–25 % perlite. Well-draining. pH 5.5–6.5.

When should I repot Philodendron Imperial Red?

Repot Philodendron Imperial Red when roots circle the pot or growth slows despite good care.

Why does my Philodendron Imperial Red have ants on plant?

Philodendron is a large genus of flowering plants in the family Araceae. As of September 2025, the Plants of the World Online accepted 625 species; [2] other sources accept different numbers. [3][4] … Quick fix: Confirm diagnosis on your Philodendron Imperial Red, then address the most likely care or pest factor described in current extension guidance.

How this Philodendron Imperial Red problems guide is reviewed?

Editorial policy Review board

Written by · Reviewed by LeafyPixels Review Board · Updated June 17, 2026

This Philodendron Imperial Red problems problem guide was researched and written by . Problems symptoms on Philodendron Imperial Red, lookalike causes, and step-by-step fixes are cross-checked against extension pest, disease, and care references before publication.

We prioritize sources that hold up under scrutiny:

University cooperative extension bulletins and fact sheets (Penn State, Clemson, UMD, NC State, and similar programs)
Botanical garden and horticultural society publications
Peer-reviewed plant science and veterinary toxicology references where pet safety matters (including ASPCA Animal Poison Control)
Established reference works on indoor plant culture

The LeafyPixels editorial team then reviews the draft for clarity, step-by-step usefulness, and fit with real apartment and home conditions-not ideal greenhouse setups. When guidance changes materially, we update the page and note the revision date.

Sources used

American serpentine leafminer (*L. trifolii*) (n.d.) IN506. [Online]. Available at: https://edis.ifas.ufl.edu/publication/IN506 (Accessed: 17 June 2026).
ASPCA Animal Poison Control (n.d.) Animal Poison Control. [Online]. Available at: https://www.aspca.org/pet-care/animal-poison-control (Accessed: 17 June 2026).
between 65 and 85 degrees F (n.d.) Philodendron. [Online]. Available at: https://plants.ces.ncsu.edu/plants/philodendron/ (Accessed: 17 June 2026).
can easily fall below 30% (n.d.) Humidity And Houseplants. [Online]. Available at: https://extension.psu.edu/humidity-and-houseplants (Accessed: 17 June 2026).
common houseplant sap feeders that produce honeydew (n.d.) Insect Pests Houseplants. [Online]. Available at: https://extension.msstate.edu/publications/insect-pests-houseplants (Accessed: 17 June 2026).
Contact sprays and soaps (n.d.) Vegleafminers. [Online]. Available at: https://ipm.ucanr.edu/PMG/GARDEN/VEGES/PESTS/vegleafminers.html (Accessed: 17 June 2026).
feed on honeydew excreted by aphids and soft scales (n.d.) Ants. [Online]. Available at: https://extension.umn.edu/insects-infest-homes/ants (Accessed: 17 June 2026).
honeydew from aphids, soft scale, or mealybugs (n.d.) What Sticky Substance All Over Table Floor And Lower Leaves My Houseplant. [Online]. Available at: https://yardandgarden.extension.iastate.edu/faq/what-sticky-substance-all-over-table-floor-and-lower-leaves-my-houseplant (Accessed: 17 June 2026).
Honeydew from scale indoors may attract ants (n.d.) Scale Insects Indoor Plants. [Online]. Available at: https://extension.umd.edu/resource/scale-insects-indoor-plants (Accessed: 17 June 2026).
insecticidal soap or horticultural oil (n.d.) Common Houseplant Insects Related Pests. [Online]. Available at: https://hgic.clemson.edu/factsheet/common-houseplant-insects-related-pests/ (Accessed: 17 June 2026).
isolate the plant (n.d.) Insects Indoor Plants. [Online]. Available at: https://extension.umn.edu/product-and-houseplant-pests/insects-indoor-plants (Accessed: 17 June 2026).
low humidity conditions (n.d.) Diagnosing Poor Plant Health. [Online]. Available at: https://extension.psu.edu/diagnosing-poor-plant-health (Accessed: 17 June 2026).
moist, well-drained soil (n.d.) Philodendron Erubescens. [Online]. Available at: https://plants.ces.ncsu.edu/plants/philodendron-erubescens/ (Accessed: 17 June 2026).
Moving indoor plants between environments can also trigger leaf drop (n.d.) Lighting Indoor Plants. [Online]. Available at: https://extension.umd.edu/resource/lighting-indoor-plants (Accessed: 17 June 2026).
Odorous house ants and Argentine ants (n.d.) A Guide To House Invading Ants And Their Control. [Online]. Available at: https://content.ces.ncsu.edu/a-guide-to-house-invading-ants-and-their-control (Accessed: 17 June 2026).
Overwatering is a common cause of root problems on houseplants (n.d.) Overwatering. [Online]. Available at: https://www.missouribotanicalgarden.org/gardens-gardening/your-garden/help-for-the-home-gardener/advice-tips-resources/insects-pests-and-problems/environmental/overwatering (Accessed: 17 June 2026).
Penn State Extension recommends watering philodendrons when the top inch or so of soil is dry (n.d.) The Argument For Houseplants. [Online]. Available at: https://extension.psu.edu/the-argument-for-houseplants/ (Accessed: 17 June 2026).
Philodendron is toxic to pets (n.d.) Philodendron Pertusum. [Online]. Available at: https://www.aspca.org/pet-care/animal-poison-control/toxic-and-non-toxic-plants/philodendron-pertusum (Accessed: 17 June 2026).
philodendrons contain calcium oxalate crystals (n.d.) Heartleaf Philodendron. [Online]. Available at: https://www.aspca.org/pet-care/aspca-poison-control/toxic-and-non-toxic-plants/heartleaf-philodendron (Accessed: 17 June 2026).
Plants subjected to a significant change in environment may drop leaves (n.d.) Houseplant Diseases Disorders. [Online]. Available at: https://hgic.clemson.edu/factsheet/houseplant-diseases-disorders/ (Accessed: 17 June 2026).
Quarantine every new philodendron for two weeks (n.d.) Aphids. [Online]. Available at: https://pestsense.cahnrs.wsu.edu/fact-sheet/aphids/ (Accessed: 17 June 2026).
reproduce quickly (n.d.) Aphids. [Online]. Available at: https://extension.umn.edu/yard-and-garden-insects/aphids (Accessed: 17 June 2026).
secondary outbreaks after aphid or mite sprays (n.d.) Leaf Miners. [Online]. Available at: https://ucanr.edu/site/uc-marin-master-gardeners/article/leaf-miners (Accessed: 17 June 2026).
self-heading philodendron (n.d.) Growing Guide. [Online]. Available at: https://www.rhs.org.uk/plants/philodendron/growing-guide (Accessed: 17 June 2026).
stippling and bronzing (n.d.) Pest And Disease Problems Of Indoor Plants. [Online]. Available at: https://extension.psu.edu/pest-and-disease-problems-of-indoor-plants (Accessed: 17 June 2026).
tend sap feeders so predators cannot reach them (n.d.) Aphids. [Online]. Available at: https://ipm.ucanr.edu/home-and-landscape/aphids/ (Accessed: 17 June 2026).
too much fertilizer can cause tips of leaves to curl and brown (n.d.) Philodendron Pothos Monstera. [Online]. Available at: https://hgic.clemson.edu/factsheet/philodendron-pothos-monstera/ (Accessed: 17 June 2026).
trail to honeydew on ornamental plants (n.d.) Antmanagement. [Online]. Available at: https://ipm.ucanr.edu/PMG/GARDEN/CONTROLS/antmanagement.html (Accessed: 17 June 2026).
translucent spots on leaf margins that become reddish-brown with yellow halos (n.d.) Philodendron Diseases. [Online]. Available at: https://extension.psu.edu/philodendron-diseases (Accessed: 17 June 2026).
water-soaked at first (n.d.) Bacterial Leaf Spots Indoor Plants. [Online]. Available at: https://extension.umd.edu/resource/bacterial-leaf-spots-indoor-plants (Accessed: 17 June 2026).
Waterlogged roots cannot absorb oxygen (n.d.) Indoor Plants Watering. [Online]. Available at: https://hgic.clemson.edu/factsheet/indoor-plants-watering/ (Accessed: 17 June 2026).
wet leaves and stagnant air (n.d.) Fungal Leaf Spots Indoor Plants. [Online]. Available at: https://extension.umd.edu/resource/fungal-leaf-spots-indoor-plants (Accessed: 17 June 2026).