Problems

Chrysanthemum Problems: Causes & Quick Fixes

Quick answer

Chrysanthemum is prone to 16 common issues - each link below is a plant-specific fix guide.

Chrysanthemum houseplant

Chrysanthemum problems

Use the guides below to diagnose and fix common issues on Chrysanthemum. 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 Chrysanthemum

Aphids

Medium

Likely cause: Soft new growth in spring is highly attractive to aphid colonies.

Quick fix: Blast with water, apply insecticidal soap, or introduce natural predators. Check new growth weekly in spring.

Full fix guide →

Root Rot

Medium

Likely cause: Overwatering in cool or wet conditions - particularly common with pot chrysanthemums in autumn.

Quick fix: Ensure container has drainage holes. Allow top 2 cm to dry before watering. Reduce frequency in cool weather.

Full fix guide →

Yellow Leaves

Medium

Likely cause: Common on this plant type; confirm with recent watering, light, and root checks.

Quick fix: Inspect the plant and correct the most likely care stressor before stacking treatments.

Full fix guide →

Brown Tips

Medium

Likely cause: Common on this plant type; confirm with recent watering, light, and root checks.

Quick fix: Inspect the plant and correct the most likely care stressor before stacking treatments.

Full fix guide →

Overwatering

Medium

Likely cause: Common on this plant type; confirm with recent watering, light, and root checks.

Quick fix: Inspect the plant and correct the most likely care stressor before stacking treatments.

Full fix guide →

Underwatering

Medium

Likely cause: Common on this plant type; confirm with recent watering, light, and root checks.

Quick fix: Inspect the plant and correct the most likely care stressor before stacking treatments.

Full fix guide →

Spider Mites

Medium

Likely cause: Common on this plant type; confirm with recent watering, light, and root checks.

Quick fix: Inspect the plant and correct the most likely care stressor before stacking treatments.

Full fix guide →

Mealybugs

Medium

Likely cause: Common on this plant type; confirm with recent watering, light, and root checks.

Quick fix: Inspect the plant and correct the most likely care stressor before stacking treatments.

Full fix guide →

Leggy Growth

Medium

Likely cause: Common on this plant type; confirm with recent watering, light, and root checks.

Quick fix: Inspect the plant and correct the most likely care stressor before stacking treatments.

Full fix guide →

Slow Growth

Medium

Likely cause: Common on this plant type; confirm with recent watering, light, and root checks.

Quick fix: Inspect the plant and correct the most likely care stressor before stacking treatments.

Full fix guide →

Wilting

Medium

Likely cause: Common on this plant type; confirm with recent watering, light, and root checks.

Quick fix: Inspect the plant and correct the most likely care stressor before stacking treatments.

Full fix guide →

Drooping Leaves

Medium

Likely cause: Common on this plant type; confirm with recent watering, light, and root checks.

Quick fix: Inspect the plant and correct the most likely care stressor before stacking treatments.

Full fix guide →

Low Humidity

Medium

Likely cause: Common on this plant type; confirm with recent watering, light, and root checks.

Quick fix: Inspect the plant and correct the most likely care stressor before stacking treatments.

Full fix guide →

Not Enough Light

Medium

Likely cause: Common on this plant type; confirm with recent watering, light, and root checks.

Quick fix: Inspect the plant and correct the most likely care stressor before stacking treatments.

Full fix guide →

Fungus Gnats

Medium

Likely cause: Common on this plant type; confirm with recent watering, light, and root checks.

Quick fix: Inspect the plant and correct the most likely care stressor before stacking treatments.

Full fix guide →

Mold on Soil

Medium

Likely cause: Common on this plant type; confirm with recent watering, light, and root checks.

Quick fix: Inspect the plant and correct the most likely care stressor before stacking treatments.

Full fix guide →

Frequently asked questions

How often should I water Chrysanthemum?

Every 4–5 days during dry weather (top 2 cm dry). Reduce in cool or wet conditions. Avoid waterlogging in cool soil. In practice, water every 1–2 days during flowering season; every 3 days in cooler rest periods. Water when the top 2 cm is dry. Water generously during autumn–winter flowering; reduce after main flush.

What light does Chrysanthemum need?

Chrysanthemum grows best in full sun - 5–6 hours of direct sunlight for best flowering.

Is Chrysanthemum toxic to pets?

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

How do I propagate Chrysanthemum?

Propagate Chrysanthemum from healthy stem or root divisions during active growth.

What soil is best for Chrysanthemum?

Use well-draining fertile potting mix or garden soil. pH 6.0–7.0. A good mix includes 50% potting mix, 30% compost, 20% perlite. Good drainage while retaining moisture.

When should I repot Chrysanthemum?

Repot Chrysanthemum annually - often treated as seasonal plant; divide clumps in spring if keeping perennial, ideally in spring after flowering ends. Signs it needs a bigger pot: tight root ball, reduced flowering.

Why does my Chrysanthemum have aphids?

Soft new growth in spring is highly attractive to aphid colonies. Quick fix: Blast with water, apply insecticidal soap, or introduce natural predators. Check new growth weekly in spring.

How this Chrysanthemum problems guide is reviewed?

Editorial policy Review board

Written by · Reviewed by LeafyPixels Review Board · Updated June 22, 2026

This Chrysanthemum problems problem guide was researched and written by . Problems symptoms on Chrysanthemum, 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

*Chrysanthemum × morifolium* (n.d.) Chrysanthemum X Morifolium. [Online]. Available at: https://plants.ces.ncsu.edu/plants/chrysanthemum-x-morifolium/ (Accessed: 22 June 2026).
*Chrysanthemum morifolium* (n.d.) PlantFinderDetails. [Online]. Available at: https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=274180 (Accessed: 22 June 2026).
*Pythium* (n.d.) Chrysanthemum. [Online]. Available at: https://ipm.ucanr.edu/agriculture/floriculture-and-ornamental-nurseries/chrysanthemum/ (Accessed: 22 June 2026).
*Rhizoctonia* (n.d.) Chrysanthemum Root Crown Rots. [Online]. Available at: https://pnwhandbooks.org/plantdisease/host-disease/chrysanthemum-root-crown-rots (Accessed: 22 June 2026).
10 to 21 days depending on temperature (n.d.) Scout Garden Mums For Insect Pests To Avoid Surprises. [Online]. Available at: https://www.canr.msu.edu/news/scout_garden_mums_for_insect_pests_to_avoid_surprises (Accessed: 22 June 2026).
a brightly lit, cool indoor site near a window (n.d.) Growing Chrysanthemums Iowa. [Online]. Available at: https://yardandgarden.extension.iastate.edu/how-to/growing-chrysanthemums-iowa (Accessed: 22 June 2026).
aphids prefer for feeding (n.d.) Pn7404. [Online]. Available at: https://ipm.ucanr.edu/PMG/PESTNOTES/pn7404.html (Accessed: 22 June 2026).
because damaged roots cannot move water upward (n.d.) Mum Growers Beware Of Pythium. [Online]. Available at: https://plantpathology.ces.ncsu.edu/news/mum-growers-beware-of-pythium/ (Accessed: 22 June 2026).
blooms best with steady moisture (n.d.) Caring For Fall Mums. [Online]. Available at: https://graham.ces.ncsu.edu/news/caring-for-fall-mums/ (Accessed: 22 June 2026).
Chrysanthemums are among composites susceptible to white mold disease (n.d.) White Mold Disease Flowers. [Online]. Available at: https://extension.umd.edu/resource/white-mold-disease-flowers (Accessed: 22 June 2026).
Chrysanthemums are susceptible to soluble salts injury (n.d.) Over Fertilization Soluble Salts Injury On Mums. [Online]. Available at: https://www.umass.edu/agriculture-food-environment/greenhouse-floriculture/photos/over-fertilization-soluble-salts-injury-on-mums (Accessed: 22 June 2026).
Clemson HGIC (n.d.) Chrysanthemum Diseases Insect Pests. [Online]. Available at: https://hgic.clemson.edu/factsheet/chrysanthemum-diseases-insect-pests/ (Accessed: 22 June 2026).
Colorado State Extension (n.d.) Fungus Gnats As Houseplant And Indoor Pests. [Online]. Available at: https://extension.colostate.edu/resource/fungus-gnats-as-houseplant-and-indoor-pests/ (Accessed: 22 June 2026).
comfortable moderate band many houseplants prefer (n.d.) Diagnosing Houseplant Problems Improper Environmental Conditions. [Online]. Available at: https://yardandgarden.extension.iastate.edu/how-to/diagnosing-houseplant-problems-improper-environmental-conditions (Accessed: 22 June 2026).
develop resistance quickly when the same chemical class is overused (n.d.) Twospotted Spider Mite 3. [Online]. Available at: https://content.ces.ncsu.edu/twospotted-spider-mite-3 (Accessed: 22 June 2026).
dividing chrysanthemums in spring when new shoots are one to three inches tall, every three to five years (n.d.) Chrysanthemum Care. [Online]. Available at: https://extension.psu.edu/chrysanthemum-care (Accessed: 22 June 2026).
dry peat repels water (n.d.) Watering Hydrophobic Soil. [Online]. Available at: https://ucanr.edu/site/uc-master-gardeners-santa-clara-county/watering-hydrophobic-soil (Accessed: 22 June 2026).
Females are wingless and typically 2 to 5 mm long when mature (n.d.) Mealybug Management In Greenhouses And Interiorscapes MF3001. [Online]. Available at: https://bookstore.ksre.ksu.edu/pubs/mealybug-management-in-greenhouses-and-interiorscapes_MF3001.pdf (Accessed: 22 June 2026).
gather at terminal buds and feed on new growth (n.d.) Aphids Found On Flowers And Foliage. [Online]. Available at: https://content.ces.ncsu.edu/insect-and-related-pests-of-flowers-and-foliage-plants/aphids-found-on-flowers-and-foliage (Accessed: 22 June 2026).
Heavily infested greenhouse plants are often discarded to protect the rest of the collection (2014) Mealybugs. [Online]. Available at: https://hort.extension.wisc.edu/files/2014/11/Mealybugs.pdf (Accessed: 22 June 2026).
Humidity levels are low indoors during winter months (n.d.) Winter Houseplant Tips. [Online]. Available at: https://extension.umn.edu/news/winter-houseplant-tips (Accessed: 22 June 2026).
increased shade causes legginess (n.d.) Faq.Php. [Online]. Available at: https://ask.extension.org/kb/faq.php?id=369317 (Accessed: 22 June 2026).
local cooperative extension office (n.d.) Online resource. [Online]. Available at: https://extension.org/ (Accessed: 22 June 2026).
lose their upright posture (n.d.) Caring For Mums Through The Fall. [Online]. Available at: https://richmond.ces.ncsu.edu/news/caring-for-mums-through-the-fall/ (Accessed: 22 June 2026).
mealybugs prefer for feeding and egg laying (n.d.) G7273. [Online]. Available at: https://extension.missouri.edu/publications/g7273 (Accessed: 22 June 2026).
Mealybugs suck plant sap and excrete sticky honeydew (n.d.) Mealybugs. [Online]. Available at: https://ipm.ucanr.edu/home-and-landscape/mealybugs/ (Accessed: 22 June 2026).
MSU notes mites thrive in dry zones (n.d.) Integrated Pest Management In Greenhouse Crops E3296. [Online]. Available at: https://www.canr.msu.edu/resources/integrated_pest_management_in_greenhouse_crops_e3296 (Accessed: 22 June 2026).
mums bloom in response to short days and long nights (n.d.) Yard And Garden Garden Mums. [Online]. Available at: https://www.extension.iastate.edu/news/yard-and-garden-garden-mums (Accessed: 22 June 2026).
Mums especially need ample water when they bloom (n.d.) Chrysanthemums How To Grow Garden Mums In South Carolina. [Online]. Available at: https://hgic.clemson.edu/factsheet/chrysanthemums-how-to-grow-garden-mums-in-south-carolina/ (Accessed: 22 June 2026).
NC State recommends checking susceptible plants weekly because populations can outbreak very quickly (n.d.) Scout For Twospotted Spider Mites. [Online]. Available at: https://entomology.ces.ncsu.edu/news/scout-for-twospotted-spider-mites/ (Accessed: 22 June 2026).
Overwatering can kill roots when soil stays waterlogged (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: 22 June 2026).
paradoxical wilt when roots fail (n.d.) Drying Up Root And Crown Rot Pathogens. [Online]. Available at: https://hgic.clemson.edu/hot-topic/drying-up-root-and-crown-rot-pathogens/ (Accessed: 22 June 2026).
plants in shade grow taller with weaker and fewer stems and smaller flowers (n.d.) View. [Online]. Available at: https://extensionpubs.unl.edu/publication/g1711/na/pdf/view (Accessed: 22 June 2026).
poorly drained soils cause root rots in wet summer periods and winter injury when water stands around crowns (n.d.) Chrysanthemums Brighten Fall Garden. [Online]. Available at: https://lancaster.unl.edu/chrysanthemums-brighten-fall-garden/ (Accessed: 22 June 2026).
Pythium root rot on chrysanthemum begins with wilting, chlorosis, and water-soaked decayed roots (n.d.) Chrysanthemum Root Crown Rots. [Online]. Available at: https://pnwhandbooks.org/plantdisease/host-disease/chrysanthemum-root-crown-rots/ (Accessed: 22 June 2026).
relatively shallow roots (n.d.) How Often Water Mums 11820154. [Online]. Available at: https://www.southernliving.com/how-often-water-mums-11820154 (Accessed: 22 June 2026).
six or more hours of direct sun (n.d.) Chrysanthemums11. [Online]. Available at: https://www.missouribotanicalgarden.org/Portals/0/Gardening/Gardening%20Help/Factsheets/Chrysanthemums11.pdf (Accessed: 22 June 2026).
Spider mites thrive in dry, warm conditions (n.d.) Insects Indoor Plants. [Online]. Available at: https://extension.umn.edu/product-and-houseplant-pests/insects-indoor-plants (Accessed: 22 June 2026).
spindly shoots and poor branching (n.d.) Lighting Indoor Plants. [Online]. Available at: https://extension.umd.edu/resource/lighting-indoor-plants (Accessed: 22 June 2026).
Surface saprophytic fungi feed on decaying organic matter (n.d.) Houseplant Diseases Disorders. [Online]. Available at: https://hgic.clemson.edu/factsheet/houseplant-diseases-disorders/ (Accessed: 22 June 2026).
the Mexican mealybug has been recorded feeding on chrysanthemums among other floriculture crops (2024) Mealybugs. [Online]. Available at: https://ipm-cahnr.media.uconn.edu/wp-content/uploads/sites/3216/2024/06/mealybugs.pdf (Accessed: 22 June 2026).
too little light causes a long internode and a spindly stem (n.d.) 3 Botany. [Online]. Available at: https://content.ces.ncsu.edu/extension-gardener-handbook/3-botany (Accessed: 22 June 2026).
toxic to cats, dogs, and horses (n.d.) Chrysanthemum. [Online]. Available at: https://www.aspca.org/pet-care/aspca-poison-control/toxic-and-non-toxic-plants/chrysanthemum (Accessed: 22 June 2026).
UC IPM (n.d.) Fungus Gnats. [Online]. Available at: https://ipm.ucanr.edu/home-and-landscape/fungus-gnats/ (Accessed: 22 June 2026).
University of Minnesota Extension (n.d.) Fungus gnats with persistently wet potting mix. [Online]. Available at: https://extension.umn.edu/yard-and-garden-news/how-treat-pesky-fungus-gnats-houseplants (Accessed: 22 June 2026).
University of Nebraska-Lincoln Extension (2007) Shallow root system and well-drained soil requirement for garden mums. [Online]. Available at: https://extensionpubs.unl.edu/publication/g1711/2007/html/view (Accessed: 22 June 2026).
uses chrysanthemum as its only known host in North America (n.d.) Chrysanthemum Aphid. [Online]. Available at: https://ncipmhort.cfans.umn.edu/chrysanthemum-aphid (Accessed: 22 June 2026).
warm-season pests whose populations surge in hot, dry weather (n.d.) Twospotted Spider Mite 2. [Online]. Available at: https://content.ces.ncsu.edu/twospotted-spider-mite-2 (Accessed: 22 June 2026).
will not return to their original colour (n.d.) Diagnose Indoor Plant Problems. [Online]. Available at: https://www.extension.umd.edu/resource/diagnose-indoor-plant-problems (Accessed: 22 June 2026).
Wilting during midday heat with recovery by morning often signals heat stress, not drought (n.d.) What Wilting Really Means Heat Stress Vs Water Needs. [Online]. Available at: https://beaufort.ces.ncsu.edu/news/what-wilting-really-means-heat-stress-vs-water-needs/ (Accessed: 22 June 2026).
Wilting with wet mix often means rotting roots cannot absorb water (n.d.) Problems Common To Many Indoor Plants. [Online]. Available at: https://www.missouribotanicalgarden.org/gardens-gardening/your-garden/help-for-the-home-gardener/advice-tips-resources/visual-guides/problems-common-to-many-indoor-plants (Accessed: 22 June 2026).
Wisconsin Horticulture Extension (n.d.) Fungus Gnats On Houseplants. [Online]. Available at: https://hort.extension.wisc.edu/articles/fungus-gnats-on-houseplants/ (Accessed: 22 June 2026).