what temperature is too cold for mums

2 min read 25-12-2024

Mums, or chrysanthemums, are beloved fall flowers known for their vibrant colors and abundant blooms. But these hardy plants aren't invincible. Understanding what temperature is too cold for mums is crucial for ensuring their survival and continued beauty, especially as winter approaches. This article will guide you through the cold-hardiness of mums, providing tips to protect your plants from damaging temperatures.

Understanding Mum Hardiness Zones

Mums' cold tolerance varies depending on the specific cultivar. However, most mums are considered hardy in USDA Plant Hardiness Zones 5-9. This means they can generally withstand temperatures down to 20-25°F (-7 to -4°C). But these are just guidelines. Factors like the mum's age, overall health, and the duration of the cold snap all play a role in their ability to survive.

What Happens When Mums Get Too Cold?

When temperatures plummet below their tolerance level, mums can experience several issues:

Leaf Damage: Frost can cause leaves to turn brown and wilt, often irreversibly.
Stem Damage: Extreme cold can damage the stems, hindering the plant's ability to absorb nutrients and water.
Root Damage: Prolonged exposure to freezing temperatures can harm the roots, potentially killing the plant.
Flower Damage: Buds and open blooms are particularly vulnerable to frost, leading to shriveled or damaged flowers.

Protecting Mums From Freezing Temperatures

While some cold is acceptable, knowing when to take protective measures is key. Here's a breakdown of actions you can take based on the predicted temperature:

Above Freezing (32°F/0°C):

Generally, no action is needed. Mums can tolerate some chilling.

Near Freezing (32-28°F/0 to -2°C):

Consider covering the plants at night with a frost cloth or a sheet. This provides a barrier against the cold and prevents rapid temperature fluctuations.

Below Freezing (Below 28°F/-2°C):

More aggressive protection is necessary. Options include:

Bring them indoors: If feasible, move potted mums indoors to a cool, well-lit location.
Heavy Mulching: Apply a thick layer of mulch (such as straw or leaves) around the base of the plants. This insulates the roots and protects them from freezing.
Protective Covering: Use a larger, more substantial cover like a burlap sack or a plastic sheet propped up to prevent the cover from touching the plants. Ensure adequate ventilation to prevent rot.

Frequently Asked Questions (FAQs)

Q: How can I tell if my mums are damaged by cold?

A: Look for signs of wilting, browning leaves, or mushy stems. If the damage is limited to the leaves, the plant might recover, but severe damage to the stem or roots is often fatal.

Q: Can I save a mum that has been frost-damaged?

A: If the damage is minimal, prune away the damaged parts and provide additional care (watering, fertilization). Severe damage is usually irreversible.

Q: What is the best way to prepare mums for winter?

A: In areas with harsh winters, cutting the plants back to a few inches above the ground, adding a thick layer of mulch, and providing additional winter protection is recommended.

Conclusion

While mums are relatively hardy, knowing when temperatures become dangerously low for your plants is essential for keeping them healthy. By understanding their hardiness and implementing appropriate protective measures, you can ensure your mums thrive and continue to bring beauty to your garden year after year. Remember to consider your specific microclimate and the unique characteristics of your mum variety.