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Slender St. John's Wort · Hypericum pulchrum

Why is my Hypericum pulchrum losing its leaves?

It is less common for this plant to drop leaves, and it usually happens when the soil stays too wet or the plant is stressed by sudden environmental changes. Check the soil moisture first to see if the roots are sitting in soggy conditions.

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Check these first

  1. Check the soil moisture with your finger.
  2. Inspect the pot for standing water.
  3. Look for drafts near the plant.

Likely causes

  1. Overwatering

    Most likely

    How to tell: The leaves may turn yellow or soft before falling off, and the soil feels constantly damp.

    What to do: Stop watering immediately and let the top 2 inches of soil dry out completely. Ensure your pot has drainage holes so excess water can escape.

  2. Sudden Temperature Change

    Possible

    How to tell: Leaves drop quickly after moving the plant to a new spot or placing it near a drafty window.

    What to do: Move the plant to a stable location away from heating vents or cold drafts. Keep the plant in a spot with consistent temperatures between 60 to 75 degrees.

Leaf drop in other plants

Find out what's wrong with your slender st. john's wort

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

A few leaves dropping after a move is normal as the plant adjusts. If the plant loses more than half its leaves, it is likely struggling with root health.

Stopping it coming back

Stick to a consistent watering schedule and avoid moving the plant once it is settled in a happy spot.

Slender St. John's Wort: leaf drop? Check yours with a photo

Every plant is a little different. Take a photo of your slender st. john's wort 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

Will my plant grow new leaves?
Yes, if you fix the underlying issue, the plant will eventually push out new growth. Be patient as it recovers.
Should I fertilize a plant that is dropping leaves?
No, avoid fertilizing until the plant shows signs of new, healthy growth. Fertilizer can stress a struggling plant further.

More problems with Slender St. John's Wort

Back to the Slender St. John's Wort 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.