North America Native Plant

Lemon Lichen

Botanical name: Candelaria

USDA symbol: CANDE2

Habit: lichen

Native status: Native to North America  

Lemon Lichen: The Bright Yellow Visitor in Your Garden Have you ever noticed bright yellow, crusty patches on the bark of trees in your yard and wondered what they were? Meet Candelaria, commonly known as lemon lichen – a fascinating organism that might already be calling your garden home without ...

Lemon Lichen: The Bright Yellow Visitor in Your Garden

Have you ever noticed bright yellow, crusty patches on the bark of trees in your yard and wondered what they were? Meet Candelaria, commonly known as lemon lichen – a fascinating organism that might already be calling your garden home without you even realizing it!

What Exactly Is Lemon Lichen?

Lemon lichen isn’t actually a plant at all – it’s a lichen! Lichens are remarkable partnerships between fungi and algae that work together to create these colorful, crusty growths you see on tree bark, rocks, and other surfaces. Think of them as nature’s ultimate roommates, each bringing something valuable to the relationship.

The bright yellow to greenish-yellow appearance of Candelaria makes it one of the more eye-catching lichens you’ll encounter. It typically forms powdery or crusty patches that can range from small spots to larger colonies covering several inches of bark.

Where You’ll Find Lemon Lichen

This native North American species has quite an impressive range, appearing naturally from Canada all the way down to Mexico. You’re most likely to spot it on the bark of deciduous trees, though it can also grow on rocks and other surfaces.

Is Lemon Lichen Beneficial for Your Garden?

While you can’t exactly plant lemon lichen like you would a flower or shrub, having it show up naturally in your garden is actually a good sign! Here’s why:

  • It’s an excellent indicator of good air quality – lichens are sensitive to pollution
  • It adds natural character and authenticity to mature woodland gardens
  • It’s completely harmless to trees and doesn’t damage bark
  • It contributes to the overall biodiversity of your garden ecosystem

How to Identify Lemon Lichen

Spotting Candelaria in your garden is fairly straightforward once you know what to look for:

  • Bright yellow to greenish-yellow coloration
  • Powdery or crusty texture
  • Found primarily on tree bark, especially deciduous species
  • Forms patches that can vary in size from small spots to larger colonies
  • Most visible during humid conditions when colors appear more vibrant

Creating Conditions Where Lemon Lichen Thrives

While you can’t plant or cultivate lemon lichen directly, you can create an environment where it’s more likely to appear naturally:

  • Maintain good air quality around your property by avoiding excessive pesticide use
  • Allow mature trees to remain in your landscape
  • Avoid pressure washing or scrubbing tree bark
  • Keep humidity levels naturally balanced with appropriate watering practices

The Bottom Line on Lemon Lichen

If you discover lemon lichen growing in your garden, consider yourself lucky! Its presence indicates that your outdoor space has good air quality and is supporting a diverse, healthy ecosystem. Rather than trying to remove it, embrace this bright yellow addition as a sign that your garden is truly thriving naturally.

Remember, lichens like Candelaria are slow-growing and can take years to establish, so their presence represents a mature, stable environment – exactly what every gardener hopes to achieve!

Lemon Lichen

Classification

Group

Lichen

Kingdom

Fungi - Fungi

Subkingdom
Superdivision
Division

Ascomycota - Sac fungi

Subdivision
Class

Ascomycetes

Subclass
Order

Lecanorales

Family

Candelariaceae Hakul.

Genus

Candelaria A. Massal. - lemon lichen

Species

Plant data source: USDA, NRCS 2025. The PLANTS Database. https://plants.usda.gov,. 2/25/2025. National Plant Data Team, Greensboro, NC USA