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Green antelopehorn · Asclepias viridis

Why are there spots on my Green Antelopehorn leaves?

Spots on Asclepias viridis are less common and usually point to fungal issues caused by high humidity or poor airflow. Check the undersides of the leaves first to rule out pests like aphids.

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spots on a plant
Photo: Scot Nelson, CC0

Check these first

  1. Inspect the underside of leaves for tiny insects.
  2. Check if the foliage stays wet for long periods.
  3. Look for yellow halos around the spots.

Likely causes

  1. Fungal Leaf Spot

    Possible

    How to tell: Small brown or black circles appear on the foliage, often with a yellow halo. These spots spread when the leaves stay wet for too long.

    What to do: Remove the affected leaves immediately to stop the spread. Improve airflow around the plant and avoid overhead watering to keep the foliage dry.

  2. Aphid Damage

    Possible

    How to tell: Clusters of tiny yellow or orange insects on the stems and leaf undersides cause yellow or brown stippling. You may also see sticky honeydew on the leaves.

    What to do: Spray the plant with a strong stream of water to dislodge the aphids. If they persist, apply insecticidal soap once a week until they are gone.

Leaf spots on other plants

Find out what's wrong with your green antelopehorn

The list above covers the usual causes. Pocket Botanist looks at a photo of your actual plant and tells you the likely cause, how serious it is, and what to try first. Identification and a health check are free.

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When to worry

It is serious if the spots cover more than half the leaf surface or cause premature leaf drop. Small, isolated spots are usually just a minor cosmetic issue.

Stopping it coming back

Water at the base of the plant rather than over the leaves. Ensure your plant has plenty of space for air to circulate.

Green antelopehorn: spots? Check yours with a photo

Every plant is a little different. Take a photo of your green antelopehorn and Pocket Botanist tells you which cause is most likely, how serious it is, and what to try first. A few checks a day are free. Save the plant and you get care reminders timed for it.

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Questions people ask

Can I use a fungicide on my milkweed?
It is generally better to improve airflow and remove infected leaves first. Fungicides can sometimes harm the pollinators that rely on this plant.
Are these spots contagious to other plants?
Yes, fungal spores can spread through water splashes or wind. Keep infected plants away from your other garden specimens until they recover.

Guides to these causes

More problems with Green antelopehorn

Back to the Green antelopehorn guide

This article was generated with AI on from the plant’s care profile and is general information, not horticultural advice. Read about how we build these guides.