Dahlia Cactus (Echinocereus poselgeri)

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Sunlight Requires 6–8 hours of full direct sunlight daily; tolerate partial shade during extreme midday summer heat

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Watering Water deeply only when the soil is completely dry; avoid standing water to prevent root rot

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Temperature Thrives in 18–30°C; tolerates brief winter dips to 5°C during dormancy

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Leaf: Modified into sharp radial spines (10–15 per areole) with 1–3 thicker central spines
Flower: Large funnel-shaped pink blooms up to 10 cm wide, lightly fragrant
Stem: Blue-green cylindrical stems forming tight, spreading clumps

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Watering

Water thoroughly when soil is fully dry; allow excess water to drain completely

Fertilization

Diluted cactus fertilizer once monthly. Discontinue fertilization during winter dormancy to avoid stimulating new growth

Eggshell powder top-dress：Crush dried eggshells into fine powder; sprinkle lightly on soil surface; avoid direct contact with cactus stems

Pruning

Remove dead or damaged stems in early spring to improve airflow
Thin overcrowded clumps to reduce competition for light and nutrients
Trim broken spines only if they pose a handling risk; avoid cutting healthy stem tissue

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Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic to cats

Humans: No known toxic effects to humans

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Culture: N/A

Usage: Ornamental succulent for container gardens, rock gardens, and xeriscaping