Bidens aristosa: complete guide

Overview

Bidens aristosa, commonly known as tickseed-sunflower, is an attractive annual plant from the Asteraceae family (daisy family). This plant originates from southeastern Canada and central-east United States. The name "Bidens" refers to the characteristic two-pointed seeds, while "aristosa" refers to the hairy seed capsules.

This is a popular choice for gardeners seeking easy-to-grow flowering plants with long blooming periods. Bidens aristosa produces abundant small yellow flowers and interesting seed capsules that cling to clothing and animals, hence the name "beggarticks."

Appearance and Bloom

Bidens aristosa is a bushy annual plant typically reaching 60 to 120 cm tall. The plant has coarse, divided leaves providing interesting texture. The flowers are small, approximately 1 to 2 cm across, bright yellow and appear in great abundance.

The blooming period is extremely long - from early summer to first frost. After blooming, interesting seed capsules form with two characteristic bristles that readily cling to clothing and fur.

The entire plant radiates cheerfulness and attracts bees and butterflies.

Ideal Location

Bidens aristosa grows best in a location with full sun. The plant prefers at least 6 hours of direct sunlight daily. In very hot climates, some afternoon shade can help, but full sun gives the best blooms.

The plant also accepts partial shade, but growth and blooming will be less robust. Avoid deep shade, where blooming is severely reduced.

The plant is tolerant of windy conditions and grows well along edges.

Soil Type

Bidens aristosa is not demanding regarding soil type. The plant grows well in virtually all soils, from poor to nutrient-rich. However, well-draining soil is important.

The plant tolerates both acidic and alkaline soils. Add organic material when planting for best results, but this isn't essential. Sandy, loamy or clayey soils are all tolerated well.

Soil pH values between 5 and 7 are ideal.

Watering

Bidens aristosa loves regular water, especially during the growing season. Water when the top inch of soil feels dry. In warm periods this might mean watering almost daily.

The plant is however tolerant of drought once established. Excessive water should be avoided, as this can cause root rot.

Mulch around the plant to retain soil moisture.

Pruning

Bidens aristosa responds well to pinching. Regularly pinch off the tops to encourage more compact growth and encourage blooming. This gives a fuller plant with more flowers.

Remove spent flowers to encourage further blooms. This significantly extends the blooming period.

Also cut back damaged or weak stems.

Maintenance Calendar

Spring: Sow seeds indoors 6-8 weeks before last frost. Plant seedlings out when they have 2-3 true leaves.

Summer: Water regularly. Pinch back regularly. Enjoy full bloom. Collect seeds.

Fall: Blooming continues until first hard frost. Plant dies back after first hard frost.

Winter: Collect seeds from dead plant. Store in cool, dry place for spring.

Winter Hardiness

Bidens aristosa is not winter hardy. This is an annual that dies at first hard frost. In very mild climates it might survive as a biennial, but this is unusual.

Replant annually from seeds. However, this is easy - sow seeds in spring or let the plant self-seed in fall.

Companion Plants

Bidens aristosa grows beautifully with:

• Salvia for blue flowers and contrast
• Zinnia for red and orange blooms
• Tagetes for yellow-orange tones
• Ornamental grasses for texture
• Coreopsis for yellow flower composition

Combine for summer display.

Conclusion

Bidens aristosa is an easy-to-grow, flowering plant providing reliable, long blooming. With its yellow flowers and interesting seed pods, it adds color and texture to any flower or vegetable garden.

Seeds available at garden centers. See gardenworld.app for design inspiration with flowering plants. Discover more guides on gardenworld.app.