Pocket Botanist
_on_a_leaf,_Lisbon,_Portugal_(approx._GPS_location)_julesvernex2.jpg){kind=link}
Check these first
- Look closely at the tips of the stems for small moving insects.
- Check for fine webbing between the stems.
- Inspect the soil surface for any signs of crawling pests.
Likely causes
Aphids
PossibleHow to tell: You will see clusters of tiny green or black insects gathering on the tender new growth. They often leave behind a sticky residue called honeydew.
What to do: Spray the stems with a strong stream of water to knock the aphids off. If they persist, apply insecticidal soap once a week for 3 weeks. Make sure to reach the undersides of the stems.
Spider Mites
PossibleHow to tell: Fine, dusty webbing appears between the stems, and the plant may look slightly discolored or stippled. This usually happens in very dry, hot conditions.
What to do: Increase the humidity around your plant by misting it or keeping the soil consistently wet. Wipe the stems down with a damp cloth to remove the mites and webs. If the infestation is heavy, use neem oil as directed on the label.
Find out what's wrong with your marsh horsetail
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.
Scan with your phone's camera to get the app
Or go to pocketbotanist.app/get on your phone
When to worry
Small numbers of pests can be managed easily, but you should worry if the stems start turning yellow or dying back rapidly. A few stray insects are rarely a sign of a terminal problem.
Stopping it coming back
Keep your plant well watered and in a humid environment to discourage pests. Regularly inspect the stems during your watering routine to catch any issues early.
Marsh horsetail: pests? Check yours with a photo
Every plant is a little different. Take a photo of your marsh horsetail 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.
Scan with your phone's camera to get the app
Or go to pocketbotanist.app/get on your phone
Get the app · Or check it from a photo now, free
Questions people ask
- Will these pests kill my plant?
- Usually no, as long as you catch them early. Marsh horsetail is quite resilient if its water and light needs are met.
- Should I use chemical pesticides?
- Avoid harsh chemicals if possible, as they can damage the delicate stems. Gentle options like water sprays or insecticidal soap are much safer for this plant.
Guides to these causes
More problems with marsh horsetail
Back to the marsh horsetail 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.