What kills lilies?

1. Introduction
2. Types of Lilies
3. Common Diseases That Can Kill Lilies
4. Unfavorable Environmental Conditions That Can Kill Lilies
5. Pests That Can Kill Lilies
6. Herbicides to Kill Lilies
7. Physical Removal of Lilies
8. Prevention Tips to Avoid Killing Lilies
9. Natural Predators of Lilies
10. Conclusion
11. Resources


Lilies are a popular and beautiful flower, often used to add color, scent and structure to gardens and bouquets alike. While they are relatively hardy flowers, there are a variety of issues that can lead to their death including diseases, pests, unfavorable environmental conditions, and herbicides or other physical removal methods. In this article we will explore the various ways in which lilies can be killed and what preventative measures can be taken to ensure that they remain healthy and vibrant in gardens everywhere.

Types of Lilies

Before exploring the various ways in which lilies can be killed, it is important to understand the different types of lilies available for flowering gardens and landscapes. Generally, lily species may be grouped into two categories: true lilies (Lilium species) or daylily (Hemerocallis). True lilies are bulbous plants that range in height from 6-8 feet depending on the species, whereas daylily is a perennial ground cover that may reach heights up to 3 feet.

Common Diseases That Can Kill Lilies

Unfortunately, there are a number of diseases that can affect lily plants and lead to their death or severe damage if left untreated. Fungal disease is one of the most common issues affecting lily plants with symptoms including spots on leaves or petals, yellowing foliage and stunted growth due to root rot or leaf blight. Bacterial infections can also cause wilting or death of the plant if not treated with an appropriate fungicide.

Unfavorable Environmental Conditions That Can Kill Lilies

In addition to disease-related deaths, certain environmental conditions can cause significant damage or death for lily plants as well. Excessive temperatures (above 85 degrees Fahrenheit) can cause wilting or scorching of foliage while temperatures below 55 degrees Fahrenheit may cause damage to the roots and bulbs resulting in stunted growth or death over time.

Pests That Can Kill Lilies

Many insects feed on both true lily plants as well as daylily plants with varying levels of damage caused by each pest species across the board. Slugs, aphids, snails and spider mites are some of the most common insect pests that feed on both varieties of lily plants with serious damage caused by spider mites in particular as they tend to feed on foliage and flowers alike.

Herbicides To Kill Lilies

Nonselective herbicides such as glyphosate may also be used to kill both true lily plants as well as daylily plants; however, this should be done with caution as these herbicides will kill any vegetation that it comes into contact with including other desirable plants in your garden or landscape.

Physical Removal Of Lilies

For non-herbicide treatments such as physical removal you should dig out the entire root system once the tops of the plant have turned brown; this is usually an indication that the plant has died off completely due to unfavorable environmental conditions or disease/pest infestation.

Prevention Tips To Avoid Killing Lilies

To prevent any potential issues from arising in regards to diseases, pests or unfavorable environmental conditions it is important to ensure proper care for your flower garden at all times; this includes ensuring adequate drainage within soil beds so water does not stand for too long and posing an ideal environment for fungal growth along with regular monitoring for signs of pest/disease infestation.

Natural Predators Of Lilies

Additionally there are a number natural predators that feed on insects responsible for damaging/killing lily plants; these include ladybugs, lacewings and certain types of birds such as chickadees which eat aphids responsible for damaging foliage/flowers on both true lilly plants as well as daylillies.




In conclusion there are many potential issues that can lead to the death or severe damage of your flower garden’s prized possession – lily plants! It is important therefore that you remain vigilant when it comes to monitoring for signs of disease/pest infestation along with unfavorable environmental conditions so you may take corrective action when necessary; additionally taking preventative measures such as adequate drainage within soil beds along with introducing natural predators should help keep your flower garden healthy overall!




If you have any further questions regarding how best care for your flower garden’s prized possession please do not hesitate contact a qualified horticulturist who will be able assist you further! The following resources may also provide additional information:

  • University Of Minnesota Extension – Daylillieshttps://www.extension.umn.
  • Oregon State University Extension – True Lilyshttps://extension.
  • University Of California IPM – Common Pests Of Bulbs & Cormshttps://ipm.
  • The Spruce – How To Care For Lily Plantshttps://www.


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