Is Galinsoga parviflora a weed?

Yes, it is widely considered an aggressive weed in gardens and agricultural fields.

Yes, it is edible, but ensure you have correctly identified it before consumption.

Plant guide

Guascas.

Galinsoga parviflora

Pronounced gal-in-SO-ga par-vi-FLOR-a

Also known as Galinsoga Weed, Gallant Soldier, Gallant-soldier

Gallant Soldier — Photo by Paulius Rupšas (CC BY) via iNaturalist

This little plant is a common garden weed that is actually quite tasty in soups. It grows quickly and produces tiny white flowers that look like miniature daisies. You will find it popping up in disturbed soil throughout the growing season.

At a glance

Care level: Easy
Plant type: Annual herb
Light: Full sun to partial shade
Indoor light: Direct sun
Water: Every 2 to 5 days
Mature size: 24 inches
Growth rate: Fast
Hardiness: USDA 2 to 11
Bloom time: Late spring to autumn

Care

Keep the soil consistently moist to encourage lush growth. Watch for wilting if the sun gets too intense during hot summer afternoons. It is a prolific seeder, so pull it before it drops seeds if you want to control its spread.

Watering: Keep the soil evenly damp but never waterlogged.
Feeding: Apply a balanced liquid fertilizer once a month during the active growing season.
Pruning: Pinch back the tips to encourage a bushier shape and prevent early flowering.
Repotting: Since it is an annual, you will typically start fresh from seeds each year.
Soil: Well draining loamy soil
Soil pH: 6.0 to 7.5
Temperature: 5 to 35°C
Humidity: 40 to 70%

Safety

People: The plant is generally considered non toxic but should be consumed with caution due to potential nitrate accumulation.
Children: There are no specific safety concerns for children, though it is best to prevent them from eating wild plants.
Contact allergens: Contact with the foliage may cause mild skin irritation in sensitive individuals.
Airborne allergens: The pollen may trigger mild allergic reactions in those sensitive to Asteraceae family plants.
Edibility: While edible, it is often confused with toxic lookalikes and can accumulate nitrates if grown in nitrogen rich soil.

How to identify it

Small white ray florets
Opposite serrated green leaves
Hairy stems and foliage
Yellow central disc florets
Small bushy growth habit

Height: 0.1 to 0.75m
Spread: 0.1 to 0.4m
Leaves: green, deciduous
Flowers: white, yellow, 0.5 to 1cm
Fruit: black, Summer to autumn

Problems to watch for

Powdery mildew · A fungal infection that creates a white dusty coating on the leaves.

By symptom

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Growing it

Propagation: seed
When to plant: spring

It is best managed as a wild companion rather than intentionally planted due to its invasive nature.

Grows well with

Tomato · They often grow together in garden settings as opportunistic companions.

Similar species

Shaggy soldier · It is very similar in appearance but has hairier stems and leaves.

Science

Family: Asteraceae
Genus: Galinsoga
Order: Asterales
Class: Magnoliopsida
Native range: South America
Conservation: It is considered a widespread invasive weed in many parts of the world and is not of conservation concern.

It thrives in disturbed habitats and open soil where it can quickly colonize and outcompete slower growing plants.

Value to wildlife: nectar source
Pollinators: bees, butterflies
Uses: culinary herb, wildlife forage

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 2/9
Soil reaction: 6/9
Light: 7/9
Temperature: 6/9
Moisture: 6/9
Nutrients: 7/9

Taxonomy resolved against GBIF.

Questions people ask

Is Galinsoga parviflora a weed?: Yes, it is widely considered an aggressive weed in gardens and agricultural fields.
Can I eat it?: Yes, it is edible, but ensure you have correctly identified it before consumption.

Where the name comes from

The genus name honors the Spanish botanist Ignacio Mariano Martinez de Galinsoga, while the species name means small flowered.

Good to know

It is commonly known as gallant soldier in English.
The plant can produce thousands of seeds per individual.
It is often used in soups and stews in parts of South America.
It thrives in disturbed soils and gardens.

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This guide was generated with AI on October 27, 2026 and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.