The Green Journal

Plant Pest & Disease Identification and Treatment Guides

Browse identification and treatment guides for the most common houseplant pests and diseases, from sap-sucking insects like spider mites and mealybugs to fungal and bacterial issues like root rot and leaf spot.

Indoor Plant Pest Eradication: Full ID & Treatment featured article

Plant Profiles

Indoor Plant Pest Eradication: Full ID & Treatment

After clearing infestations in over 2,000 homes, I’ll teach you to identify pests by their damage, mix the perfect neem oil spray, and use BTI to kill gnats at the source—all without toxic chemicals.

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Latest Plant Care Guides

Crawlable, practical articles linked to calculators and plant entities.

Two leaves side by side: one with white, powdery mold patches, the other with fine webbing and tiny specks from spider mites, magnifying glass highlighting the difference
Article · 5 min

Mold or Spider Mites? Identify & Treat the Difference

A ZZ plant with several yellowing, drooping stems in a plastic pot, a moisture meter reading 'wet' inserted into the soil
Article · 5 min

ZZ Plant Yellow Leaves? Summer Rot Rescue Guide

White fluffy saprophytic mold covering the surface of moist dark potting mix in a terracotta pot with a healthy Pothos trailing beside it
Article · 7 min

White Mold on Houseplant Soil — Causes & Treatment

White cottony mealybug clusters on the stem joints of an indoor houseplant
Article · 11 min

Mealybugs on Houseplants: Treatment & Prevention

Close-up of brown soft scale insects clustered along the stem of an indoor Monstera plant with visible honeydew residue
Article · 12 min

Scale Insects on Houseplants: ID & Treatment

Fiddle leaf fig houseplant with dark black sooty mold patches on upper leaf surfaces in a bright living room, showing contrast between affected and clean leaves
Article · 8 min

Sooty Mold on Houseplants: Causes, Fixes & Prevention

Close-up of spider mite damage on a houseplant leaf with fine webbing and stippling under bright indoor light
Article · 7 min

Spider Mites on Houseplants: How to Stop Them Fast

Extreme close-up of a monstera leaf showing thrips damage — silvery bronze streaking and scattered black fecal specks across dark green leaf surface
Article · 4 min

Thrips on Houseplants: Identify, Treat & Prevent

Whitefly infestation on a hibiscus leaf underside — a circular arc of pale yellow eggs and flat translucent nymph scales clustered along the central vein
Article · 7 min

Whiteflies on Houseplants: ID, Treat & Prevent

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Aquarium Fertilizer Calculator: Macro & Micro Doses

Calculate exact macro and micro fertilizer doses for your planted aquarium based on tank volume, plant density, CO2 system, and dosing strategy.

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Compost Calculator: How Much Do You Need?

Get the perfect compost volume for your garden in seconds. No more excess bags or weak amendments – tailored for your soil type (sand, clay, loam).

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Grow Bag Size Calculator: Find the Right Bag for Every Plant

Find the perfect grow bag size for your plant based on root depth, plant type, and expected mature size.

Plant Guide

African Violet

African Violets are classic indoor bloomers, but their fuzzy leaves demand a unique watering approach. We break down the 'bottom-watering' technique essential for preventing crown rot and triggering year-round flowers.

Plant Guide

Aglaonema Red Siam

The Red Siam Aglaonema is arguably the easiest colorful houseplant in existence. It features dark green leaves bordered with striking neon red, and it easily tolerates missed waterings and low light.

Plant Guide

Alocasia Amazonica

The Alocasia Amazonica (African Mask Plant) is a stunning but demanding houseplant. It requires high humidity, warmth, and careful watering to prevent root rot and leaf drop.