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How to Grow Ambrosia Artemisiifolia Plants in your Garden

Gardener's HQ Guide to Growing Ragweed

Ambrosia Artemisiifolia, better known as Common Ragweed is one of the most commonly seen members of the daisy family in the US.

Its widespread nature across North America of Common Ragweed has seen it classified by many farmers and gardeners as a weed that should be removed if possible. It is also considered as an invasive species in many other parts of the world.

Ambrosia Artemisiifolia is also a problem for many people because of the high levels of pollen it produces, these are known to cause allergies in many people, and touching the plant itself can cause itchiness and eye irritations.

That said many gardeners are happy to use Common Ragweed in their yards because this plant has a long tradition of attracting various insects (which feed on it). It also attracts honey bees, which are important pollinators for this plant.

Ragweed

Ambrosia artemisiifolia photograph by Radu Chibzii.

Birds, including game birds, can also be attracted to the seeds of Common Ragweed because they enjoy the oily seeds that are produced.

Ambrosia Artemisiifolia Gardening Basics

  • What is Ambrosia Artemisiifolia?

    More commonly known as Common Ragweed, Ambrosia Artemisiifolia is a flowering plant that is usually considered a weed, and is invasive in many parts of the world. The pollen a known source of allergies.

    It is not usually grown in gardens as it can spread rapidly from its tubers and readily appears in lawns and beds.

  • Why grow Ragweed in the garden?

    It's main use in a garden is as part of wild plant section used to attract birds and insects to the garden.

    It's pollen is collected by honey bees, so is a great plant to grow (under control) in areas where bees are in decline/p>

  • Will Vigengar kill Ragweed?

    Acetic acid can be used as an herbicide on young plants if deployed at high concentrations (tyically 4 times as concentrated (20%+ acetic acid) as is found in shop bought vinegars (~5% acetic acid).

  • How to get rid of Ragweed

    Depending on where they are growing you may wish to use a herbicide or remove by hand.

    If they are growing in your vegetable patches then use a hoe to remove them. You will need to frequently how new growth as they grow from burried tubers. Over time they should stop appearing.

    In beds, you can pullup ragweed by hand. Be sure to use gloves as these plants have spikes and can cause allergies. If plants are already producing pollen you may also wish to use a facemask when removing Ambrosia Artemisiifolia from the garden.

    If Ragweed is affecting your lawn, then simply mow over them; they will lose their vigour over time. You can also apply a broadleaf herbicide.

    If using a herbicide, then either use glyphosate or one aimed at broad leaf plants. Apply when the plants are small (middle of spring through to the start of summer). Larger plants will rquire multiple applications.

Ambrosia Artemisiifolia Growing Guide

Nearly all soil types can be used to grow Ambrosia Artemisiifolia with this plant being tolerant of dry to average moisture levels.

If left unchecked the Common Ragweed is a plant that can grow high and uncontrollably. Reaching heights of three to seven feet tall (0.9 to 2.1 m), with a similar width.

Flowers of the Common Ragweed are green with deep green opposite leaves. Stems are hairy. Plants produce flowers from mid-Summer through to the Fall.

Ambrosia Artemisiifolia grows upright with erect hairy stems reaching high into the air. This can make it ideal for adding some height to the the back of the garden.

Ambrosia artemisiifolia Growing and Care Guide

  • Scientific Name: Ambrosia artemisiifolia
  • Common Name: Ragweed, Bitterweed
  • Growing Zone: USA:
  • Life Cycle / Plant Type: Annual

Plant Details

  • Plant Height (Inches): 36 to 84
  • Plant Spread (Inches): 36 to 84
  • Time of Bloom: Mid-summer to mid-autumn
  • Flower Details: Green
  • Leaf Foliage: Green
  • Fruit:
  • Growth Form: Upright / erect

Ideal Growing Conditions

  • Best Light Conditions: Partially shady to full sunlight
  • Rate of Growth: Average pace
  • Suitable Soil Types: Adaptable, Clay, Loamy, Sandy, Well drained
  • Soil Moisture: Dry to Moist (Medium Moisture is likely gives best results)

Caring Conditions

  • Care:
  • Level of Maintenance:
  • Propagation:
  • How to Prune:
  • Pests:
  • Diseases:

Further Information

  • Can Attract: Honeybees, moths, grasshoppers
  • Tolerant of:
  • Best Garden Use: Weed - Not a garden plant
  • Family: Asteraceae (Aster and Daisy)
  • Closely Related Species: Other members of this diverse family include Wild Artichoke, the Gazania plant, Leontopodium and even the salad plant lettuce.
  • Miscellaneous: North American native, Invasive, Inconspicuous flowers or blooms. Often grown for potential herbalist properties such as the support of nausea and fever, and potential use as a laxitive.
  • Further Reading and References: RHS plant finder and Illionos Wild Flowers

I hope that you enjoyed this guide on how to grow Ambrosia artemisiifolia. You may also enjoy the following growing guides:

Ambrosia (Muskmelon variety). Other annual herbs covered on the site include: How to grow Dill and Basil plants.



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