Plants Active during the day

mouse-eared hawkweed

Pilosella officinarum

iNaturalist Wikipedia

A hardy and tenacious wildflower, the mouse-eared hawkweed blankets sunny fields with its distinctive lemon-yellow blooms and fuzzy, 'mouse-ear' leaves. While it may be a modest grower, its ability to thrive in the toughest soils makes it a fascinating subject for backyard naturalists.

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Quick Identification

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Size

Flower stems 5–30 cm (2–12 in) tall; basal leaves 1–12 cm (0.4–4.7 in) long

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Colors

Lemon-yellow flower heads, sometimes with distinct red or orange-red stripes on the outer underside of the ray florets; pale grayish-green leaves.

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Key Features

Single lemon-yellow flower head per leafless stem
Basal rosette of oval leaves covered in long, white bristly hairs
Creeping above-ground runners (stolons) that form dense mats
Underside of leaves are felted with white star-shaped hairs

When You’ll See Them

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Activity pattern Active during the day

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Peak hours 9 AM - 4 PM

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Season May-August

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Diet As a photoautotroph, it creates its own energy via photosynthesis using sunlight, water, and carbon dioxide. It is particularly efficient at extracting nutrients from poor, dry soils where other plants fail.

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Habitat Dry grasslands, heathlands, sandy coastal dunes, railway embankments, and neglected suburban lawns.

Behavior

Mouse-eared hawkweed is a fascinating study in botanical persistence and competition. It is best known for its allelopathic behavior, meaning it releases chemical compounds into the soil that inhibit the germination and growth of neighboring plant species. This biological strategy allows it to create exclusive territories, forming thick, carpet-like mats that can eventually choke out diverse grasses and wildflowers. It spreads aggressively both through wind-dispersed seeds and via its stolons—creeping stems that root at the tips to create new clones of the parent plant.

The plant is highly sensitive to light and environmental conditions. Its flowers exhibit a strong circadian rhythm, opening wide during bright, sunny hours to attract pollinators and closing tightly during rain or at night to protect its pollen. While it is often viewed as a stubborn weed by gardeners and farmers due to its ability to thrive in poor, acidic soils, it is a vital nectar source for a variety of specialized solitary bees and hoverflies.

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Camera Tips

To capture the best footage of mouse-eared hawkweed, you need to think small and get low. Because these plants rarely exceed a foot in height, your camera should be mounted on a ground-level stake or even placed directly on a flat stone. Angling the lens slightly upward (about 15-20 degrees) provides a majestic "forest of flowers" perspective that makes the lemon-yellow blooms stand out against the sky. This low angle is also perfect for capturing the fine, white "mouse-ear" hairs on the leaves, which are a defining characteristic of the species.

Time-lapse is the ideal setting for this species. Configure your camera to take a shot every 5 to 10 minutes from sunrise to sunset. This will allow you to see the dramatic way the flowers "wake up" in the morning sun and close back up as the evening light fades. If you are tracking the growth of the plant over a season, a single photo taken at the same time every day will reveal how the creeping stolons march across the ground to claim new territory. Ensure you use a macro lens or a close-focus setting if your hardware allows, as the intricate red striping on the underside of the petals is a beautiful detail often missed by the naked eye.

Since hawkweed is a favorite of pollinators, focus your camera on a particularly vibrant cluster of flowers during peak sunlight hours (typically 10 AM to 2 PM). Set your trigger speed to high or use a video mode to catch solitary bees and hoverflies in action. Be mindful of the sun's position; direct midday sun can wash out the pale yellow color of the petals. Positioning your camera so the sun is at a side angle will highlight the texture of the hairy stems and leaves. If you're using a trail camera, ensure the PIR sensor is sensitive enough or use a timed capture mode, as the plant's movement is generally too slow to trigger motion sensors unless a large insect lands on it.

Similar Species

Species that look similar or are commonly confused with mouse-eared hawkweed.

Common Dandelion

Dandelions have hollow stems and jagged, hairless leaves, whereas hawkweed has solid stems and hairy, oval leaves.

Orange Hawkweed

Identical in growth habit but features vibrant fiery-orange flowers instead of lemon-yellow.

Smooth Hawkweed

Lacks the creeping stolons (runners) and the dense white hairs on the leaves that characterize the mouse-ear variety.

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Frequently Asked Questions

Mouse-eared hawkweed flowers are most active during the peak daylight hours, typically between 9 AM and 4 PM. They are highly light-sensitive and will close their petals tightly at night or during heavy overcast weather to protect their reproductive parts.

This plant prefers dry, well-drained, and somewhat acidic soil in full sun. While many see it as an invasive weed, you can encourage it by leaving sunny, nutrient-poor patches of your lawn unmowed. However, be aware that its allelopathic nature may stop other flowers from growing nearby.

Like all plants, mouse-eared hawkweed gets its energy from sunlight through photosynthesis. It takes in water and minerals through its root system and is uniquely adapted to thrive in soils that are too poor in nutrients for most other grasses and flowers.

Yes, they are very common in suburban settings, especially in lawns, along sidewalks, and on gravelly embankments. Their ability to spread via runners (stolons) allows them to quickly fill in gaps in a lawn where grass is struggling to grow.

While both have yellow flowers, mouse-eared hawkweed has a single flower head on a solid, leafless stem, and its leaves are small, oval, and covered in long hairs. Dandelions have hollow stems with milky sap and deeply lobed, hairless leaves that look like 'lion's teeth.'

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