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Cactus Drought Stress Symptoms: Shrink, Yellow, Die Top-Down

Progression

Diameter shrinks (water depletion).
Tissue shrivels/wrinkles.
Death from apex downward.
Color shifts: green → yellow → brown.

Reversibility

Early stages (shrink/yellow) recover with deep watering. Top-down death = usually fatal.

Cactus: Euonymus Fortunei Leaf Drop and Brown Edges: Underwatering or Scale?; Lemon Plant Losing Leaves, Stem Drying: Critical Light Deficiency; Invasive Mint Control: No Allelopathic Plant Exists; Ornamental Cactus Crown Rot: Surgical Removal and Cultural Correction; White Substance on Gardenia: Mealybugs and Cold Hardiness; Aloe Plant Soil Mold & Leaning Arm: Beneficial Fungi, Check Roots; Red Yucca (Hesperaloe) Care and Seed Propagation; Yucca Plant Decline: Why Fertilizer Spikes Make It Worse; ZZ Plant (Zamioculcas zamiifolia): The Nearly Indestructible Houseplant; ZZ Plant (Zamioculcas zamiifolia): Care Guide for Stylish Low-Maintenance Plant

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