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Tiny yellow dots on top of Fiddle Leaf Fig leaves.

7 years ago
Does anyone have experience with this? Tiny little pin prick yellow dots? Is it rust?
It seems like it just suddenly appeared.

Comments (6)

  • 7 years ago
    That is a huge relief! Thank you!
    Is that the same thing as when you see super tiny little white dots on jade plants?
  • 7 years ago
    last modified: 7 years ago

    That's a physiological issue that occurs when your plant takes up water from the soil with dissolved minerals (salts) in it. Some of that water, with salt dissolved in it, makes it to the surface of the leaf. When the water evaporates, it leaves behind the salt it contains as a little white powdery dot. This is also harmless, but could be a signal that the level of dissolved solids (salts) in the soil is creeping upward. If you witness it, you might try flushing the soil thoroughly - especially if you've been watering in small sips so the plant doesn't have to deal with soil saturation. That particular way of watering ensures that all salts from your tapwater and fertilizer solutions remain in the soil where they can create quite a bit of mischief. The salt deposits on the leaves will rub right off with a damp cloth or paper towel.

    If the dots don't wipe off, suspect another physiological issue called oedema.

    Oedema

    Oedema is a physiological disorder that can affect
    all plants. It occurs when the plant takes up more water than it can
    rid itself of via the process of transpiration. The word itself means
    'swelling', which is usually the first symptom, and comes in the form
    of pale blisters or water-filled bumps on foliage. Under a variety of
    circumstances/cultural conditions, a plant's internal water pressure
    (turgidity) can become so high that some leaf cells rupture and leak
    their contents into inter-cellular spaces in leaf tissue, creating
    wet or weepy areas. Symptoms vary by plant, but as the malady
    progresses, areas of the leaf turn yellow, brown, brown with reddish
    overtones or even black, with older damage appearing as corky/ scaly/
    ridged patches, or wart/gall-like bumpy growth. Symptoms are seen
    more frequently in plants that are fleshy, are usually more
    pronounced on the underside of leaves, and older/lower leaves are
    more likely to be affected than younger/upper leaves.



    Oedema is most common in houseplants during the
    winter/early spring months, is driven primarily by excessive water
    retention in the soil, and can be intensified via several additional
    cultural influences. Cool temperatures, high humidity levels, low
    light conditions, or partial defoliation can individually or
    collectively act to intensify the problem, as can anything else that
    slows transpiration. Nutritional deficiencies of Ca and Mg are also
    known contributors to the malady.



    Some things that can help you prevent oedema:



    * Increase light levels and temperature

    * Monitor water needs carefully – avoid
    over-watering. I'd heartily recommend a soil with drainage so sharp
    (fast) that when you to water to beyond the saturation point you
    needn't worry about prolonged periods of soil saturation wrecking
    root health/function. Your soil choice should be a key that unlocks
    the solutions to many potential problems.

    * Avoid misting or getting water on foliage. It
    slows transpiration and increases turgidity.

    * Water as soon as you get up in the AM. When
    stomata close in preparation for the dark cycle, turgidity builds. If
    you water early in the day, it gives the plant an opportunity to
    remove (for its own needs) some of the excess water in the soil.

    * Put a fan in the room or otherwise increase air
    flow/circulation. Avoid over-crowding your plants.

    Al

  • 7 years ago
    Thank you, Al! That was so informative!! I was able to wipe the dots off, so that is a relief! I’ve alway tended to water until it ran through the pot significantly, but I’ve changed my watering to the morning per your suggestion. I think I need to switch out my soil to the one you recommend....I’m having a hard time finding the bark though and I feel nervous about doing right by the roots of my plants during the transition and who needs gritty and who needs the other blend, what type of plant food to use...I loved what you wrote about being patient and using the time to understand the wishes of the plant. I wish you had a blog and YouTube channel! I’m sure you have answered all these same questions over and over and if I dig around, I can find them!

    “You can always expand your growing experience to include learning more about the wants and dislikes of the plants you tend. The science that promotes proficiency is very interesting, and will raise the plane on which you interact with your plants. Think of it as an investment in self satisfaction.”
    LOVE this!!
  • 5 years ago

    So informative! Thanks 😊

  • 5 years ago

    Thanks and a belated thanks for the kind words.

    Al