Yellowing Anthurium forgetii – House Plant Journal

Yellowing Anthurium forgetii

Plant: Anthurium forgetii

How long have you owned the plant? 1 to 6 months

Concerns:

The leaves have yellow spots and I try to get rid of it using insecticide for a month but nothing happens.

I also tried to repot the plant – it has been already 3 weeks since I repotting but no better sign for the leaf.

The problem occurred almost 4 months ago I think.

Light Situation:

Plant Parent: I try to measure the light using mobile apps, and the light condition is around 152 fc in the afternoon.

How do you determine WHEN to water? I wait for the soil to become just slightly dry.

Describe HOW you water: I fully soak the soil, letting excess drain away.

What fertilizer (if any) do you use? I use leaf fertilizer only and vermicompost for the soil. I mix the vermicompost with the soil.

Darryl’s Analysis

Environment
Looks like your plants live outside covered by shade cloth – this is PERFECT for tropical foliage plants!  I’m not sure what kind of light meter you’re using but direct sun shining through a shade cloth should measure 3000 to 6000 FC.

Effort
Your watering strategy sounds good but I’m not sure whether foliar feeding (fertilizer that you spray onto leaves) is ideal for Anthuriums.  I’ve seen good growth from standard liquid fertilizer, dissolved into your watering water.  Perhaps you could switch to using a high nitrogen liquid fertilizer.

It’s hard to see from the photos but those pin-prick marks could be from spider mite damage.

More details about identifying and treating spider mites: houseplantjournal.com/spider-mites/

Expectations
Even if you get rid of the spider mites and change to liquid fertilizer, this kind of yellowing will never turn green again.  You will feel better about this plant when new leaves start growing – which is hopefully soon since you have excellent light conditions.


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