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The Infirmary

Expert pest control and plant disease troubleshooting protocols.

Why Are My Plant Leaves Turning Yellow?

March 8, 2026December 23, 2025 by Mark Tavis
Plant Leaves Turning Yellow

Quick Diagnosis What Do Your Yellow Leaves Look Like? 💧 Yellow + Mushy/Soft Overwatering → Let soil dry completely. Check for root rot. 🔥 Yellow … Read more

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Diatomaceous Earth for Fungus Gnats: The 3-Week Kill Protocol

February 14, 2026December 15, 2025 by Mark Tavis
Food-grade Diatomaceous Earth powder applied to houseplant soil to kill fungus gnat larvae.

🔬 URBAN LAB QUICK ANSWER How to use DE for gnats: Apply food-grade diatomaceous earth (amorphous silica) to dry topsoil to kill fungus gnat larvae. … Read more

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Aloe Microstigma Care: 5 Tips for Vibrant Red Leaves & Healthy Blooms

February 14, 2026December 14, 2025 by Mark Tavis
Aloe Microstigma showing vibrant red stress coloring in high light.

🔬 The Urban Lab Answer Red/pink leaves with firm texture? Your Aloe microstigma is producing anthocyanins—a natural sunscreen. This is healthy sun stress and actually … Read more

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Mark Tavis

The founder and head botanist behind The Urban Lab. With over a decade of specialized experience in high-performance urban plant care, my mission is to provide data-driven troubleshooting protocols that cut through common gardening myths. My commitment to blending horticultural science with zero-waste practices ensures every guide published is reliable, tested, and tailored for indoor microclimates.

Recent Posts

  • Philodendron Birkin care — healthy specimen with bold white pinstripe variegation on dark green leaves in bright indirect light from an east-facing window
    Philodendron Birkin Care and Grow: The Complete Indoor Guide
    by Mark Tavis
  • How to care and grow Hoya — close-up of a mature Hoya carnosa vine with waxy dark green leaves and a cluster of pink star-shaped flowers emerging from a perennial peduncle, mounted on a vertical bamboo trellis in a terracotta pot
    How to Care and Grow Hoya Plants: The Complete Epiphyte Guide
    by Mark Tavis
  • Hoya propagation in tree fern fiber — rooted Hoya cutting with visible white aerial roots emerging from a fibrous growing medium in a clear net pot
    Hoya Propagation: Tree Fern Fiber vs Moss & Complete Care Guide
    by Mark Tavis
  • Wisteria frutescens container care — American wisteria with purple flower racemes cascading from a large ceramic pot on a sunny patio
    Wisteria Frutescens Container Care: Complete Outdoor Pot Guide
    by Mark Tavis
  • How to grow daisies — white Shasta daisies in full bloom in a sunny garden border with green foliage
    How to Grow Daisies: Shasta Daisy Care & Complete Guide
    by Mark Tavis
  • Orchid care for beginners — healthy white Phalaenopsis orchid in a clear plastic pot on an east-facing windowsill with bright indirect light
    Orchid Care for Beginners: Complete Indoor Growing Guide
    by Mark Tavis

The Urban Lab

Data-driven botanical protocols and scientific troubleshooting for the modern grower. We simplify plant biology into actionable blueprints for high-performance urban gardening.

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